Summary Highlights of NRC/DOE Technical Exchange and ... · DRAFT AGENDA DOE/NRC MEETING ON REPOSITORY THERMAL MANAGEMENT 10:00 A.M. -4:45 P.M. (EDT) August 2, 2001 Room 03B-4 11555

Summary Highlights of NRC/DOE Technical Exchange and Management Meeting on Range of Operating Temperatures

August 2, 2001

Rockville, Maryland

Introduction and Objectives

This Technical Exchange and Management Meeting on Range of Operating Temperatures is one in a series of meetings related to the U.S. Nuclear Regulatory Commission (NRC) key technical issue (KTI) and sufficiency review, and the potential U.S. Department of Energy (DOE) site recommendation. The objectives for this meeting were for DOE to (1) summarize the Supplemental Science and Performance Analyses (SSPA) model supplements since the Science and Engineering Report and (2) discuss differences between higher-temperature and lower-temperature operating modes based on process models. This was the first of two separate meetings on this topic. The second meeting, currently scheduled for September 2001, will focus on the NRC staffs questions pertaining to DOE's SSPA.

Consistent with NRC regulations on prelicensing consultations and a 1992 agreement with the DOE, staff-level resolution can be achieved during prelicensing consultation. The purpose of issue resolution is to assure that sufficient information is available on an issue to enable the NRC to docket a proposed license application. Resolution at the staff level does not preclude an issue being raised and considered during the licensing proceedings, nor does it prejudge what the NRC staff evaluation of that issue will be after its licensing review. Issue resolution at the staff level, during prelicensing, is achieved when the staff has no further questions or comments at a point in time regarding how the DOE is addressing an issue.

Summary of Meeting

DOE provided a general briefing on the Yucca Mountain thermal design history, the current thermal management methodology, and the scope of the SSPA and comparison of the thermal operating modes. No NRC/DOE agreements were reached at this Technical Exchange and Management Meeting. The agenda and the attendance list are provided in Attachments 1 and 2, respectively. Copies of the presenters' slides are provided in Attachment 3. Highlights from the Technical Exchange and Management Meeting are listed below.

Highlights

1) DOE's Yucca Mountain Project - Thermal Design History

DOE discussed the changes in DOE's thermal goals since the Viability Assessment (see "YMP Thermal Design History" presentation given by Paul Harrington). DOE then discussed its next steps in moving toward a possible license application and stated its license application design would include a fixed design with flexible operational modes. DOE further stated that it would be formulating the decision process for selecting the licensing operating mode. This process would establish the thermal operating mode, determine appropriate thermal limits, and select operational ranges or parameters for licensing. The NRC staff had several questions related to

EnclosureI

the design. These questions will be more fully discussed during the next meeting on this subject.

2) DOE's Current Thermal Management Methodology

DOE discussed its Yucca Mountain methodology for thermal management and the effects of this methodology on the design process (see "Current Thermal Management Methodology" presentation given by Gene Rowe). DOE discussed the design presented in the Science and Engineering Report and the SSPA and stated that it represents a single design which will work over the full range of thermal modes. DOE then discussed these different thermal modes and the potential range of operational variables. DOE stated that some of the attributes of flexible operations are: (1) ability to operate under various thermal modes, (2) ability to accommodate variations in waste stream characteristics, (3) ability to accommodate changes in receipt and emplacement rates, and (4) ability to provide for checks and balances for problem detection andi corrective action. The NRC staff had several questions related to the methodology. These questions will be more fully discussed during the next meeting on this subject.

3) Scope of the SSPA and Comparison of Thermal Operating Modes

DOE discussed the scope of the SSPA and the comparisons between the thermal operating modes (see "Scope of the SSPA and Comparison of Thermal Operating Modes" presentation given by James Blink and Robert Howard). DOE discussed the organization and scope of the SSPA and provided a summary of the supplemental modes and analyses made since the Science and Engineering Report. DOE then went into a little more detail on these changes. The NRC staff had a number of questions regarding the updated scientific information, uncertainty analysis changes, and how certain changes impacted the cooler thermal operating mode. These questions will be more fully discussed during the next meeting on this subject.

4) Public Comments

Ms. Judy Treichel (Nevada Nuclear Waste Task Force) commented that the second meeting of this subject should not occur during the Nuclear Waste Technical Review Board meeting scheduled for September 10-12, 2001. The NRC stated that it was aware of this meeting and would try to avoid scheduling it on the same days.

Ja s . Andersen, Project Manager Timothy C. Gunter h Level Waste Branch Regulatory Interactions

Division of Waste Management Office of Licensing & Regulatory Compliance Office of Nuclear Material Safety U.S. Department of Energy

and Safeguards U.S. Nuclear Regulatory Commission

2

DRAFT AGENDA DOE/NRC MEETING ON REPOSITORY THERMAL MANAGEMENT

10:00 A.M. - 4:45 P.M. (EDT) August 2, 2001 Room 03B-4

11555 Rockville Pike Rockville, MD

Via videocon to: Region IV, DOE, Las Vegas, and CNWRA, San Antonio, Texas

10:00 - 10:15 a.m.

10:15 - 10:45 a.m.

10:45 - Noon

Noon - 1:00 p.m.

1:00 - 2:45 p.m.

Introduction and Opening Remarks

Thermal Management History of the Proposed Repository

Current Thermal Management Methodology

DOE - Gunter NRC - Andersen

DOE - Harrington

DOE - Trautner/Rowe

Lunch

Supplemental Science and Performance Analyses Overview - Evaluation of the Range of Thermal Operating Modes

DOE - Blink

2:45 - 3:15 p.m.

3:15 - 4:15 p.m.

4:15 - 4:45 p.m.

Caucus

Discussion

Conclusion, Closing Remarks and Adjourn

Attachment 1

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Attachment 3

Presenters' Slides

YUCCA MOUNTAIN PROJECT

U.S. Department of Energy Office of Civilian Radioactive Waste Management

YMP Thermal Design History

Presented to:U. S. Nuclear RegulatoryC(

YMP Historical Time Phases Reflecting Changes in Thermal Goals

- Viability Assessment (VA)

- License Application Design Selection (LADS)

- Nuclear Waste Technical Review Board (NWTRB) and Other Party Inputs

- Thermal Operational Scenarios Considered

- Science and Engineering Report (S&ER)

- Next Step

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMHarrington_080201 .ppt 2

Evolution of Design FeaturesParameter Viability Enhanced Current Reference Design and

Assessment Design Operating Mode Alternative II

High End Low End Average waste package maximum surface 230 230 -175 <85 temperature (0C) _

Maximum drift-wall temperature (0C) 200 200 <175 <85 Pillar temperature (0C) >96 Center below 50% below 96 <85

.96 Areal mass loading(MTHM/acre) 85 60 -60 -40 Area for 70,000 MTHM (acres) 741 1,050 1,050 1,600 Total excavated emplacement drift length 107 54 -60 -80 (Km) Waste-package spacing (meters) Variable 0.1 0.1 2 Line/point load Point Line Line i Point Drift spacing (meters) 28 81 81 i 81 Preclosure ventilation period (yrs) 50 50 50 I 300 Preclosure ventilation flow rate (M3/s) 0.1 2 to 10 15 15 for 50 years NVP __*driven for 250 years Waste package max heat output (KW) 18 11.8 11.8 11.8 PWR waste package avg heat output (KW) 9.3 9.8 11.3 11.3 Total waste package avg heat output (KW) 7.3 7.4 7.6 7.6 Avg linear loading (KW /meter) 0.7 1.37 1.45 1.0 Backfill in emplacement drift Not Yes Not precluded; Not precluded

precluded _ Drip shields Not Yes Yes Yes

precluded _l

7YUCCa Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMHarrington 080201 .ppt YUCCA MOUNTAIN PROJECT

3

I *NVP = Natural Ventilation Pressure

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMHarrington_080201 .ppt

Viability Assessment 1998

* Thermal loading -- High -- 85 metric tons of heavy metal (MTHM)/acre

- Specific loading slightly higher than ACD loading

* Point loaded drifts (varies, but ~5-m avg. separation)

* 5.5 m diameter drifts spaced 28 m apart

* Boiling fronts extended 100 m above/below horizon * Entire footprint temperature above boiling for

extended period

* Matrix saturation temporarily increases above the high-temperature region


Considering Alternatives

* License Application Design Selection 1998/1999 - To reduce uncertainty in performance assessment

- 5 enhanced design alternatives (EDAs) evaluated considering low and high thermal loadings

- EDA-II recommended - 60 MTHM/acre - lower than VA * Linear loading (0.1 m spacing) and 81 m drift spacing

* 50 years forced ventilation * Boiling fronts in host rock but 50% of pillars below boiling * Draining of heat-mobilized and percolating groundwater

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMHarrington080201 .ppt 5

LADS Alternatives

V.C, Mutan---t/-rlmnryPeeiioa rf atrasBC rpisPrsnainYRrigonA2l.p YUCCA MOUNTAIN PROJECT 6

Parameters EDA-I EDA-Il EDA-III EDA-IV EDA-V

MTHM/Acre 45 60 85 85 150

Acres for 1400 1050 740 740 420 70,000 MTHM

Line or point Point Line Line Line Line load

PWR WP Size 12 21 21 21 21

Drift Spacing 43 m 81 m 56 m 56 m 32 m

Preclosure 50 years @ 2 50 years @ 2 50 years @ 2 50 years @ 2 50 years @ 2 ventilation tol10 m 3/s tol10 m3/s tol10 m 3/s tol10 m 3/s tol10 m 3/s

Total WPs 15,903 10,039 10,213 10,213 10,039

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMHarrington_080201 .ppt

Lower Thermal Operational-Modes

* Nuclear Waste Technical Review Board-- 1999/2000 Uncertainty with basis for high temperature design prompted evaluation of lower temperature alternatives

* Lower thermal operational scenarios-- 12/2000 - One: lower WP temperature through extended ventilation

(50/250 years forced/natural); minimal increase in area; increased spacing between WPs (2 m)

- Two: lower WP temperature through extended ventilation (50/250 years forced/natural); minimal increase in area; lower heat output, tightly-spaced (0.1 meter) WPs;

- Three: lower WP temperature through extended ventilation (300 years forced); minimal increase in area; reference WP size and spacing; but increased drift spacing (120 m);

YUCCA MOUNTAIN PROJECTYucca Mountain ProjectlPreliminary Predecisional Draft Materials

7BSC Graphics PresentationsYMHarrington_080201 .ppt

Yucca Mou

Lower Thermal Operational Modes (Continued)

- Four: lower WP temperature through increased area; a limited ventilation period (~125 years); no aging; increased spacing between reference WPs (6 m);

- Five: lower rock temperature and in-drift relative humidity through indefinite natural (passive) ventilation of the reference design

YUCCA MOUNTAIN PROJECT untain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMHarrington_080201 .ppt 8

Range of Thermal Operating Modes 2000/2001

Higher mode

- -60 MTHM/acre; linear load of 1.45 kW/m (0.1 m spacing); 50 years forced ventilation

* Lower mode

- -40 MTHM/acre; linear load of 1.0 kW/m (-2 m spacing); forced and natural ventilation for 300 years

* Fixed design with flexible operational modes - 5.5 m diameter drifts spaced 81 m apart

- Repository elevation and layout specified

- Two barrier waste package design

* Described in Science and Engineering Report - 2001


Next Step 2001/2002

* License application design

- Fixed design with flexible operational modes

- Decision process for selecting licensing operating mode

""Establish the thermal operating mode

""Determined appropriate thermal limits

- Selected operational ranges or parameters for licensing


Agenda • Introduction

• Present Repository Design

- Single SR Design

- SR Typical Waste Package Design

- SR Drift Design

- SR Layout

• Operational Modes - Potential Range of Operational Variables

- Options Considered for SR

- Thermal Response

* Attributes of Flexible Operations

* Licensing Approach with Respect to Flexible Operating Modes

• Summary YUCCA MOUNTAIN

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMRowe_080201.pptPROJECT

2

Introduction

• Purpose

The purpose of this presentation is to present Yucca Mountain's methodology for thermal management and discuss the effects of this methodology on the design process

* Background

The majority of the work to date has been to support the Site Recommendation effort. Design parameters have been selected to allow analyzing the performance of the repository for various operating modes. These parameters will be optimized during the final design process

- Need for Flexibility

Because the repository thermal goals are still evolving, operational flexibility is needed

I---I YUCCA MOUNTAIN PROJECT

Yucca Mountain Project/Prelimi nary Predecisional Draft Materials BSC Graphics PresentationsYMRowe_O802Ol.ppt 3

Single SR Design * The design presented in the S&ER and the SSPA

represent a single design and will work over the full range of thermal modes

Design Parameter Fixed for SR for all Modes Analyzed

Repository capacity 70,000 MTHM Emplacement rate 3,000 MTHM/year after 5-year ramp-up Emplacement period -23 years

Sequence of waste package Interspersed hotter and cooler packages to achieve emplacement average linear power density Waste package design Large, horizontally emplaced packages with

corrosion-resistant outer shell of alloy-22 and structural inner shell of 316NG

Number of waste packages -11,000

Initial waste package power 11.8 kW maximum Drift diameter 5.5 meters

Drift spacing 81 meters

Drip shields Titanium, continuous

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMRowe 080201 .ppt YUCCA MOUNTAIN PROJECT

4BSC Graphics PresentationsYMRowe_080201.pptYucca Mountain Project/Preliminary Predecisional Draft Materials

SR Typical Waste Package Design

Basket AssemWil

Inner Shell (316 NG) See Not 2

InnerOuter Shell (All (Alloy 22) See Note 1 -

Dy

Outer Shell (Alloy 22)

Inner Shell Support Ring (Alloy 22)

Shell Bottom Lid __. \ x

ft.

Outer Shell Flat Closure L (Alloy 22)

Inner Shell Top Lid (316 NG) .id

IN

Trunnion Collar (Geometry TBD)

Lower Trunnion Collar Sleeve (Alloy 22)

ý~Eyebolts See Note 3

Outer Shell Lid Lifting Feature (Alloy 22)

"Outer Shell Lid Lifting Feature (Alloy 22)

Outer Shell Extended Closure Lid (Alloy 22)

Upper Trunnion Collar Sleeve (Alloy 22)

Note 1: The Outer Shell is enlarged to allow for a continuous 10 mm gap from the Inner Shell to Outer Shell.

Note 2: The Inner Shell overall length was increased due to the addition of a 10 mm long, 25 mm thick skirt at the bottom end.

Note 3: 4 one inch diameter Eyebolts were added to the Top Inner Lid to assist with handling of the Inner Shell. After placement into the Outer Shell, the eyebolts will be removed.

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SR Drift Design

ELEVATION CAD FILE:asstOO20f Ig

.L DlrINIIS AlE S"0I0 IN MILLITE UNLESS OTERWISE NOTED

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SR Underground Layout "" N!I.N237000

iAsIf VAI\\:I VI X \ SI(: ( (VRA V' 2 1: n. . ,ct /_

S .... ............ igher end of thermal -'1--........ = operating mode

1 ...-- "7N2350000

"K iLower end of thermal NII, Ioperating mode

•:'!'::I IU chieved via 2 meter aP spacing and/or

N238 000

Layoutof '•:, •. R,izl: CC K•'•• WA: NB I: 21 •

Development Areas V•V • VA

N235 000hevd iaW AVISI<OW,0Ii 001C

"N2" 4,WLower end of thermal operating mode

VA:.. r- -- achieved via 6Pmeter * ...... 00-WP spacing

'7 ---------"I -SN233 000 agin

PootentiRaolor DeelometoAeatRerya

";- LI : J SOU~l•At• i N232 000

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S:, ,:operating mode S•," ,: achieved via 6Wmte

_S-_U )7: de- W sa cing

YUCAAOUTAN ROEC

Yucca Mountain Project/Preliminary Predlecisional Draft Materials BSC Graphics PresentationsYMRowe_080201 .ppt 7

Potential Range of Operational VariablesThese variables and ranges are preliminary and will continue to evolve as the

TSPA is refined and the design is optimized.

Variable Lower Limit Upper LimitVariables Associated with the Waste Stream

Assembly Age at Arrival

Assembly Burn-up Assembly Enrichment

5 years

N/A N/A

Variables Associated with Repository Operations Ventilation Duration 0 years

Ventilation Rate 0 CMS Waste Package Average Spacing 0.1 meters

PWR WP Capacity 1 assembly BWR WP Capacity 1 assembly

Duration of Assembly Staging at Site 0 years Amount of Staging at Site 0 MTHM

Waste Package Power at Emplacement N/A Areal Mass Loading 25 MTHM/acre

Linear Line Loading N/A

YucaMunan11/et111iiar reecsonlDrf MteilsBC1rphc IIIIttonY~oe8 O IpI!

N/A

75 GWd/t 5.0%

300 years

15 CMS 8 meters

21 assemblies

44 assemblies

30 years 40,000 MTHM

11.8 kW

60 MTHM/acre

1.45 kW/m

M YUCCA MOUNTAIN PROJECT

8Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMRowe_080201 .ppt

Options Considered for SR Scenario Scenario Scenario Scenario Scenario

1 2 3 4 5 Increased Increased

Waste De-Rated or Spacing and Extended S&ER package Smaller Duration of Surface Aging Extended Design Spacing and Waste Forced with Forced Natural SSPA SSPA

(MIPA Rev 0) Extended Packages Ventilation Ventilation Ventilation HTOM LTOM IVentilation _I

Design Paraueters Drift Center-to- 81 81 81 120 81 81 81 81 Center Spacing (m) Nunmer of Waste -11,000 -11,000 -15,000 -11,000 -11,000 -11,000 -11,000 -11,000 Packages Operational Parameters Average Waste 0.1 2 0.1 6 2 0.1 0.1 1.2 Package Spacing Surface Aging (years) 0 0 0 0 0 30 0 0 Emplacement Period -23 -23 -23 -23 -243 -23 -23 -23 (years)

Forced Emplacemnent 50 75 75 125 125 75 50 300 Ventilation After Start of Enmlacement(years) Natural Ventilation 0 250 250 0 0 >300 0 0 (years) Results Linear Thermal 1.45 1.00 1.00 0.7 0.5 1.45 1.35 1.12 Loading (kW/m) Total Emplacement -60 -80 -90 -130 -80 -60 -60 -75 Drift Excavation Length (kin)

Required Emplacement Area -1,150 -1,600 -1,800 -2,500 -1,600 -1,150 -1,150 -1,450 (acres)

Average Waste -160 <85 <85 <85 <85 <85 -160 <85 Package Maxinmum Temp (0CQ

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations3MRoweo8O2Ol .ppt YUCCA MOUNTAIN PROJECT

9Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentationsý_YMRowe_080201.ppt

Thermal Response HITOM and LTOM Temperature Histories

SSPA V1, ROO ICN01

200

180

160

140

120

100

80

60

40

20

00 1,000 2,000 3,000 4,000 5,000

Time, yr

6,000 7,000

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMRoweO8O2Ol .ppt

,000 9,000 10,000

YUCCA MOUNTAIN PROJECT 10

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Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMRowe_080201.ppt

Attributes of Flexible Operations

• Ability to operate under various thermal modes

* Ability to accommodate variations in waste stream characteristics

* Ability to accommodate changes in receipt and emplacement rates

* Ability to provide for checks and balances for problem detection and corrective action

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMRowe_080201 .ppt 11

Licensing Approach With Respect to Flexible Operating Modes

- License application will be for a single design

* Operational parameters will be bounded and included in the License Specifications

* Thermal response will be bounded by the design parameters and operating modes analyzed in the TSPA-LA

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Summary

* A set of design and operational parameters have been identified for the purpose of SR engineering and performance analyses

* The on going design and performance analyses provide us with a foundation that will allow us to continue to converge on a set of optimum design and operational parameters during the licensing phase of the program

° License application will be for a single design, with operational parameters specified in the License Specifications, and will be bounded by the TSPA-LA analyses


Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMRowe_080201 .ppt 13

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Objective , Summarize SSPA model supplements since the S&ER

* Synthesize higher-temperature and lower-temperature operating modes (HTOM/LTOM) contrast based on process models

Organization = SSPA Organization, volumes 1 and 2

* Subsystem

- Process model developments for SSPA studies

- Comparison of HTOM and LTOM process-level results

* Total System dose results from the TSPA-SR and SSPA

- Key model developments affecting dose

- Nominal and disruptive event scenarios YUCCA MOUNTAIN PROJECT

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Relationship of SSPA Vol. 1 and Vol.

* Vol. 1 provides technical bases for analyses documented in Vol. 2

2

° "One-off" sensitivity analyses in Vol. 2 and guidance from Vol. 1 determine the content of the supplemental TSPA model

Significant changes in input

forwarded to TSPA

UU analyses comparing to

TSPA Rev 00, ICN 01

Only a portion of UU info input

forwarded to TSPA

Analysis of Range of thermal operating

modes plus UU

Chapter 3 Chapter 4

VOLUME 1 - SCIENCE ANALYSES "• New Science "• Unquantified Uncertainty Analyses "• Range of thermal operating modes

Yucca Mountain Project/Preliminary Predecisional Draft Materials

VOLUME 2 - PERFORMANCE ANALYSES

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Scope of SSPA Volume 1

* Volume 1 Covers the major process expected to occur at Yucca Mountain and supplements the information described in Analyses and Model Reports and Process Model Reports

* Subjects are organized in a manner similar to the organization found in the Yucca Mountain Science and Engineering Report

* Volume 1 focuses on the technical work within each process model area, encompassing uncertainty quantification, updated scientific bases, and analyses of a range of operating modes

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01 .ppt 4

Scope of SSPA Volume 1 (Continued)

Three General Types of Information * Unquantified Uncertainties Analysis

- Specific uncertainties that were not treated explicity in the AMRs and PMRs supporting the S&ER have been quantified including parameter bounds, conceptual models, assumptions, and in some cases input parameters consisting of statistically biased or skewed distributions

* Updates in Scientific Information

- This includes new experimental results, new conceptual models, new analytical approaches, and the identification and discussion of multiple lines of evidence

• Thermal Operating Mode Analyses

- Includes process level information regarding thermal dependencies; how the process responds to a range of thermal inputs and the impacts on uncertainty in process level results


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Scope of SSPA Volume 1 (Continued)

* Sections 3-14 include a summary of the conceptual basis for models used in the S&ER

* Specific content and level of detail of each section varies depending on:

- Extent of the analyses performed

- Amount of new information and data that has been generated since the publication of the S&ER and supporting documents

- Amount of information necessary required to evaluate the range of thermal operating modes

* Each section contains a summary of information and recommendations for use in Volume 2 if appropriate

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt 6

Outline of SSPA Volume 2* Introduction

• Methods and Approach

* Sensitivity Analyses

- 3.1 System-Level Evaluation--Nominal Scenario

- 3.2 Subsystem-Level Evaluations--Nominal Scenario

- 3.3 Evaluations of Disruptive Performance

• Supplemental Total System Performance Assessment Model

- 4.1 System-Level Evaluations--Nominal Scenario

- 4.2 Subsystem-Level Evaluations--Nominal Scenario

- 4.3 System-Level Evaluation of Igneous Disruption

* Summary and Conclusions

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBIink 08/02101.ppt YUCCA MOUNTAIN PROJECT 7Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01.ppt

Attributes of Repository Performance

Climate

Unsaturated Zone Row V.ste Seepage Package

Z Degradiation

Waste Form Degradation

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBIink 08/02/01 .ppt YUCCA MOUNTAIN PROJECT 8Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt

RN

Summary of Supplemental Modes and Analyses

Performance Assessment

Reason For Supplemental Scientific Treatment Of Supplemental Model Or Analysis Scientific Model Or AnalysisW

Cooler Topic Of Supplemental Unquantified Update in Thermal TSPA Included in

Key Attributes Process Model Scientific Model Uncertainty Scientific Operating Section of Sensitivity Supplemental

Of System (Section of S&ER) Or Analysis Analysis Information Mode Analysis Volume 1 Analysis TSPA Model

Limited Water Climate (4.2.1) Post-I0,000-year Climate Model X 3.3.1 X X Entering Net Infiltration (4.2.1) Infiltration for post-10,000-year 3.3.2 X X Emplacement Climate Model Drifts Unsaturated Zone Flow in PTn x _3.3.3

Flow (4.2.1) 3-D flow fields for cooler design;

flow fields for post-i0,000 yr climate, lateral flow; variable x X 3.3.4 thickness of PTn; fault property uncertainty

Effects of lithophysal properties on x 3.3.5 thermal properties

Coupled Effects on Mountain-scale Thermal- x X 3.3.5 UZ Flow (4.2.2) Hydrologic effects

Mountain-scale Thermal- x x 3.3.6 Hydrologic-Chemical effects

Mountain-scale Thermal- x x 3.3.7 Hydrologic-Mechanical effects

Seepage into Flow-focussing within 4.3.1, Emplacement Drifts heterogeneous permeability field; X X 4.3.2, X X (4.2.1) episodic seepage 4.3.5

Effects rock bolts and drift X 4.3.3, degradation on seepage 4.3.4

Coupled Effects on Thermal effects on seepage X X 4.3.5 X X Seepage (4.2.2) Thermal-Hydrologic-Chemical x X 4.3.6

effects on seepage

Thermal-Hydrologic-Mechanical X 4.3.7 effects on seepage_ x

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink_08/02/01 .pptYUCCA MOUNTAIN PROJECT

9BSC Graphics PresentationsYMBlink_08/02/01 .pptYucca Mountain Proj ect/Prelimi nary Predecisional Draft Materials


(Continued) Performance Assessment

Treatment of Supplemental Process Model Reason for Supplemental Scientific Scientific Model or Analysis

(Section of Yucca Model or Analysis (Discussed in Volume 2) Mountain Science Unquantified Update in Cooler Thermal TSPA Included in

Key Attributes and Engineering Topic of Supplemental Uncertainty Scientific Operating Mode Section of Sensitivity Supplemental of System Report) Scientific Model or Analysis Analysis Information Analysis Volume 1 Analysis TSPA Model

Long-Lived Water Diversion Multiscale thermal-hydrolic Waste Package Performance of EBS model, including effects of X X 5.3.1 X and Drip Shield (4.2.3) rock dryout

Thermal property sets X X 5.3.1 X

Effect of in-drift convection on temperatures, humidities, invert x X 5.3.2 saturations, and evaporation rates

Composition of liquid and gas entering drift x x 6.3.1 x x

Evolution of in-drift chemicalxx 6.3.3 X X environment

Thermo-Hydro-Chemical model comparison to plug-flow reactor X 6.3.1 and fracture plugging experiment Rockfall X 6.3.4

In-Drift Moisture Environment on surface of drip X 5.3.2 Distribution (4.2.5) shields and waste packages

Condensation under drip shields X 8.3.2 X

Evaporation of seepage X X 8.3.1 X X 5.3.2

Effect of breached drip shields x X 8.3.3 X X or waste package on seepage

Waste package release flowx8.34 x geometry (flow-through, bathtub)

Drip Shield Local chemical environment on Degradation and surface of drip shields (including Performance (4.2.4) Mg, Pb) and potential for X 7.3.1

initiating localized corrosion

Blink 34 ai

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/0 1 .ppt YUCCA MOUNTAIN PROJECT 10Yucca Mountain Project/Preliminary Predlecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt


(Continued)Performance Assessment

Treatment of Supplemental

Process Model Reason for Supplemental Scientific Scientific Model or Analysis

(Section of Yucca Model or Analysis (Discussed in Volume 2)

Mountain Science Unquantified Update in Cooler Thermal TSPA Included in Key Attributes and Engineering Topic of Supplemental Uncertainty Scientific Operating Mode Section of Sensitivity Supplemental

of System Report) Scientific Model or Analysis Analysis Information Analysis Volume I Analysis TSPA Model

Long-Lived Waste Package Local chemical environment on Waste Package Degradation and surface of waste packages and Drip Shield Performance (4.2.4) (including Mg, Pb) and potential X 7.3.1

for initiating localized corrosion

Aging and phase stability effects x x 7.3.2 X on A-22

Uncertainty in weld stress state X 7.3.3 X X following mitigation

Weld defects X 7.3.3 X X

Early failure due to improper x X 7.3.6 X X heat treatment

General corrosion rate of A-22: X x 7.3.5 X X Temperature dependency

General corrosion rate of A-22:. X 7.3.5 X X Uncertainty/variability partition

Long-term stability of passive X 7.3.4 films on A-22

Stress threshold for initiation of x x 7.3.3 X X stress corrosion cracking

Probability of non-detection of X 7.4.3 X X manufacturing defects

Number of defects X 7.3.5 X X

Distribution of crack growth x x 7.3.7 X X exponent (repassivation slope)

Limited In-Package Effect of HLW glass degradation Release of Environments (4.2.6) rate and steel degradation rate X X 9.3.1 X X Radionuclides on in-package chemistry from the Engineered Cladding Effect of initial perforations, Barriers Degradation creep rupture, stress corrosion X X 9.3.3 X X

and Performance cracking, localized corrosion, (4.2.6) seismic failure, rock overburden

failure, and unzipping velocity on cladding degradation

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink 08/02/01 .ppt YUCCA MOUNTAIN PROJECT 11Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt

I


(Continued)

Performance Assessment Treatment of Supplemental

Process Model Reason for Supplemental Scientific Scientific Model or Analysis (Section of Yucca Model or Analysis (Discussed in Volume 2) Mountain Science Unquantified Update in Cooler Thermal TSPA Included in


Limited DHLW Degradation HLW glass degradation rates Release and Performance x x x 9.3.1 of (4.2.6) Radionuclides Dissolved Solubility of neptunium, thorium, from the Radionuclide plutonium, and technetium X X X 9.3.2 X X Engineered Concentrations Barriers (4.2.6)

Colloid-Associated Colloid mass concentrations Radionuclide x 93.4 x Concentrations (4.2.6)

EBS (Invert) Diffusion inside waste package X X 10.3.1 X x Degradation and Transport pathway from inside Transport (4.2.6, waste package to invert x x 10.32 4.2.7) Sorption inside waste package X X 10.3.4 X X

Sorption in invert X X 10.3.4 X X

Diffusion through invert X 10.3.3 X X

Colloid stability in the invert X 10.3.5

Microbial transport of colloids X X 10.3.6

Blink 36.ai

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01 .ppt YUCCA MOUNTAIN PROJECT 12Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt


(Continued)


Process Model Reason for Supplemental Scientific Scientific Model or Analysis (Section of Yucca Model or Analysis (Discussed in Volume 2)


of System Report) Scientific Model or Analysis Analysis Information Analysis Volume I Analysis TSPA Model

Delay and Unsaturated Zone Effect of drift shadow zone - X X 11.3.1 X X Dilution of Radionuclide advection/diffusion splitting Radionuclide Transport (Advective Effect of drift shadow zone Concentrations Pathways; concentration boundary X 11.3.1 by the Natural Retardation; Barriers Dispersion; Dilution) condition on EBS release rates

(4.2.8) Effect of matrix diffusion X 11.3.2, 11.3.3

3-D transport X 11.3.2

Effect of coupled ThermoHydrologic, Thermo-HydroChemical, and Thermo-Hydro- X X 11.3.5 Mechanical processes on transport

Saturated Zone Groundwater specific discharge X X 12.3.1 X Radionuclide Flow and Transport Effective diffusion coefficient in X 12.3.2 X (4.2.9) volcanic tuffs

Flowing interval spacing 12.3.2 X

Flowing interval (fracture) X 12.3.2 X porosity Effective porosity in the alluvium X 12.3.2 X

Correlation of the effective diffusion coefficient with matrix X 12.3.2 X porosityII

Bulk density of the alluvium X X _12.3.2 X X

Blink_37.ai

Yucca Mountain ProjectfPreliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink_08/02/01 .ppt YUCCA MOUNTAIN PROJECT 13Yucca Mountain Project/Preli mi nary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt


(Continued) Performance Assessment

Treatment of Supplemental Process Model Reason for Supplemental Scientific Scientific Model or Analysis

(Section of Yucca Model or Analysis (Discussed in Volume 2) Mountain Science Unquantified Update in Cooler Thermal TSPA Included in


Delay and Saturated Zone Retardation for radionuclides Dilution of Radionuclide irreversibly sorbed on colloids X X 12.3.2 X Radionuclide Transport (4.2.9) in the alluvium Concentrations No matrix diffusion in volcanic 1252 X by the Natural tuffs case Barriers Presence or absence of alluvium 12.5ý2 X

Sorption coefficient in alluvium X 123.2 X for I, Tc

Sorption coefficient in alluvium X X 12.32 X for Np, U

Sorption coefficient for Np in X 12.3.2 X volcanic tuffs Kc model for groundwater colloid concentrations Pu, Am X 12.5.2 X

Enhanced matrix diffusion in 1252 X volcanic tuffs

Effective longitudinal dispersivity X X 12.3.2 X New dispersion tensor X 12.3.2 Flexible design X 12.3.2 Different conceptual models of the large hydraulic gradient and X 12.3.1 their effects on the flow path and specific discharge Hydraulic head and map of X 12.3.1 potentiometric surface

Biosphere (42.10) Receptor of interest X 13.3.1 Comparison of dose X 13.3.2 assessment methods Radionuclide removal from soil X 13 3 3 by leaching Uncertainties not captured by X 13.3.4 GENII-S Influence of climate change on X 13.3.5 groundwater usage and BDCFs 13.37 BDCFs for groundwater and 1336. X X igneous releases 13.38.

X__ _13.438

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01 .ppt

Blic~k-38 a,

YUCCA MOUNTAIN PROJECT 14BSC Graphics PresentationsYMBiink_08/02/01 .pptYucca Mountain Project/Preliminary Predlecisional Draft Materials


(Continued)


Process Model Reason for Supplemental Scientific Scientific Model or Analysis

(Section of Yucca Model or Analysis (Discussed in Volume 2)


of System Report) Scientific Model or Analysis Analysis Information Analysis Volume 1 Analysis TSPA Model

Low Mean Volcanism/Igneous Probability of dike intersection of Annual Dose Activity (4.3.2) repository for the operating X 14.3.3.1 X Considering mode described in S&ER Potentially Scaling factors to evaluate Disruptive impacts of repository design X 14.3.3.2 Events changes

Contribution to release of Zones 1 and 2 X 14.3.3.3 X

Sensitivity to waste particle size 14.3.3.4 X distribution X_14.3.3.4_X

New wind speed data X 14.3.3.5 X X

Explanation of method for handling ash/waste particle size X 14.3.3.6 and density Volcanism inputs for Supplemental TSPA Model X 14.3.3.7

New aeromagnetic data X 14.3.3.8 X .,;", '3. i

NOTE: S&ER = Yucca Mountain Science and Engineering Report a Performance assessment treatment of supplemental scientific model or analysis discussed in SSPA Volume 2

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink_08/02/01 .ppt YUCCA MOUNTAIN PROJECT 15

IBllnK ,3.al

BSC Graphics PresentationsYMBlink_08/02/01 .pptYucca Mountain Proj ect/Prel imi nary Predecisional Draft Materials

Subsystems, UZ flow , Thermal seepage

, In-drift thermal hydrology

0 Thermal-hydrologic-mechanical (THIM) effects

- Thermal-hydrologic-chemical (THC) effects, in-drift water and gas chemistry

0 Waste package (WP) corrosion

0 Water diversion in the engineered barrier system (EBS)

* Waste form mobilization

* EBS transport

* Unsaturated zone (UZ) transport

* Saturated Zone (SZ) transport

* Biosphere

• Disruptive events YUCCA MOUNTAIN PROJECT

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt 16

0 0.4

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* Examined lateral flow in the PTn

* Expanded 3-D flow fields

* Included lithophysae in thermal properties

° New Thermal Hydrologic Chemical (THC) model development-addressed processes beyond scope of drift-scale THC models

* New Thermal Hydrologic Mechanical (THM) model development-addressed multi-phase flow and calculated stress-induced permeability changes


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• Expanded seepage model to include Tptpll

* Reduced conservatism in flow focusing factor

* Used a more realistic 3-D drift degradation seepage model

* TH, THC, THM-Examined range of thermal operating modes

* THM-Developed a fully coupled THM Continua Model and improved the THM Distinct Element Model


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Key Thermal-Hydrologic Environment Uncertainties Evaluated in SSPA Vol. 1

* Model (Conceptual) Uncertainty * Process * Input Data

- Use of effective thermal conductivity Uncertainty Uncertainty and thermal radiation approaches - Hysteresis - Invert

- Neglecting dryout during ventilation of imbition properties

- Coupling of submodels - THM & THC - Host rock changes to bulk

- Localized effects of seepage hydrologic permeabil

- Neglecting fracture heterogeneity properties - Host rock impacts on seepage thermal conductiv

- Neglecting effects of mountain-scale (wet & dry gas-phase convection

-Host rock - Effects of lithophysal porosity on heat capak

vapor storage

NOTE:

DKM = dual permeability model

THM = thermal-hydrologic-mechanical

THC = thermal-hydrologic-chemical

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBIink 08/02/01 .ppt

ity

ity r)

city

Host rock lithophysal porosity

WP thermal output

Ventilation duration and eficiency

YUCCA MOUNTAIN PROJECT 22BSC Graphics PresentationsYMBlink-08/02/01 .pptYucca Mountain Project/Preliminary Predlecisional Draft Materials

The LTOM Thermal History is Similar to theHTOM after a

w 100

(D 80

E 6) a

Few Thousand LTOM 2600 yr Shifts (Optimal)

H TOM _LTOM + 2600-yr shift

U -102 103 104 105 106

Time (yr) 8,,0m_ a0

* HTOM models include the LTOM environments

* High temperature parts of the models could increase HTOM uncertainty compared to LTOM

HTOM and L TOM performance are similar because the HTOM thermal pulse does not significantly affect the EBS or Natural Barrier System

Yucca Mountain ProjectfPreliminary Predecisional Draft Materials BSC Graphics PresentationsYMBIink 08/02/01.ppt YUCCA MOUNTAIN PROJECT 23

Years

BSC Graphics PresentationsYMBlink_08/O2/01.pptYucca Mountain Project/Preliminary Predlecisional Draft Materials

WP Temperature Sensitivity to Location and WP Type

Location in Footprint Waste Package Type

104 105 10

Time (yr) Blink lb.ai

* The variability range for location and WP type ~200C

is

* The variability range for operating mode is ~9 00C

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC GraUhics Presentations YMBlink 08/02/01. ot 24

180

160

140

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Sensitivity of WP Relative Humidity (RH) to Infiltration Rate and Operating Mode

(All WP Types and Locations)Location in Footprint

102 10 3

LTOA

Waste Package Type

104 105 106 102 103 104 105 106

Time (yr) Time (yr) Blink_28a.ai

4 low RH duration is similar to HTOM

Yucca Mountain ProjectlPreliminary Predecisional Draft Mate�aIs BSC Graphics PresentationsYMBlink 08/02/0 1 .ppt YUCCA MOUNTAIN PROJECT 25

-4

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Yucca Mountain Project/Preli mi nary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt

C) 0 'A

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(All Waste Package Types and Locations)

1.0 -", j,.. • WPs in the HTOM

0.8 - Exhibit larger SLMNtemperature LTOM ICN01

co - variability S0.60.6 \Stronger

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M 0.4- infiltration flux

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................. Lower Infiltration Flux - - - - Upper Infiltration Flux

01 60 80 100 120 140 160 180 200

Peak Waste Package Temperature (1C) Blink-7c.ai

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01.ppt 28. .

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Supplemental Engineered Barrier System Chemical Environment Model

* Main improvement for the TSPA-SR supplemental chemical environment model is the propagation of uncertainty associated with the composition of water and gas entering the emplacement drifts

Different PCO2 soil horizon starting conditions (high PCO2

and low PCO2 cases)

- HTOM versus LTOM


Key Chemical Environment Uncertainties

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink 08/02/01 .ppt

Blink_32.ai


Key Uncertainty Not Included in Model Improvements Included in Supplemental S&ER Models Discussed in SSPA TSPA Model

Volume 1

Composition of liquid and gas Yes Yes entering drifts

Seepage/Invert mixing and interactions Yes No

Trace elemental compositions and Yes No effects on chemistry

Radionuclide sorption onto corrosion Yes Yes products

Cement leachate effects on in-drift Yes No chemistry

Generation of colloids from corrosion Yes No products

Yucca Mountain Project/Prelimi nary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt

E

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II I-I . I - I L 10,000

1 100 10,000 1,000,000 Time (yr) Blink_17.ai

HTOM and LTOM are similar after a few 1000 years


Yucca Mnountain Pro•ict/Preliminarv Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01.ppt 33

LTOM

HTOM

S........ r -- -- I II . . . . . .... .....La i ..I F .I j . . . ..I ..........I . . . . . ......... .... .... ......

Invert Evaporation Sensitivity to Location

30

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20

15

10

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0102 10 3 104 105

Time (yr)

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01 .ppt

106

Blink 4b.ai

YUCCA MOUNTAIN PROJECT 34Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt

pH for Higher CO2 Case Pore Water - Type Seepage

8

7

I6

5

4

0.01 0.1

1 - Qe/Qs (also known as 1 - Res)

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYM Blink 08/02/0 1 .ppt

10 Blink_30.ai


0.001

Yucca Mountain Project/Preli mi nary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt

Waste Package Corrosion Developments Since TSPA-SR

* Range of water chemistries affect salt development

- The WP Critical RH Model in TSPA-SR considered only carbonate base brines

- The SSPA considered near-neutral pH brines, and the possibility of soluble calcium and magnesium halides

* Considered potential effect of soluble Pb and other minor constituents in natural systems

* Also considered other sources of soluble salts

- Entrained matter in ventilation air

- Rock dust

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01.DPt 36

a I • m I g

Alloy 22 Phase Stability in SSPA

* New data increases confidence in TSPA-SR - Theoretical modeling of base metal does not show phase

instabilities under repository conditions

- Long-range ordering (LRO) not expected below 3000C

- Preliminary weld data do not indicate instabilities below approximately 2000C

• Alternative lines of evidence

- Degradation in mechanical and corrosion properties due to aging does not appear likely at temperatures below 3000C

- Two-phase metastable structures in Josephinite stable for more than 100 million years


BSC Graphics PresentationsYMBlinkO8/O2/Ol.ppt 37Yucca Mountain Project/Preliminary Predecisional Draft Materials

- ~~General Corrosion Rate(mlr

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WP Temperature-Humidity Trajectories and the Crevice Corrosion Initiation Window of

Susceptibility 100 0 Crevice corrosion initiates by

IPE HTOM breaching the passive film 80-E 8aC_ The process model crevice

60 y O corrosion initiation window

60- includes T, [Cl] and pH =3 -3000 yr/ 1I

STOM - The pH dependence dominates T 40- and [CI-]

The TSPA crevice corrosion 2 MgC,2 initiation is based on pH

Window

0 410 80I,,iII I I I , ,0 Both LTOM and HTOM avoid 020040 60 80 100 120 140 160 180 200 crevice corrosion

Temperature (1C) Blink-9f.ac

- LTOM: Temperature criterion

- HTOM: Chemistry (pH) criterion


WF Mobilization Developments Since TSPA-SR

• In-Package Chemistry

- Effects of HLW glass and steel degradation rates (on pH-time trajectories and actinide dissolution)

• Dissolved Concentrations of Th, Np, Pu and Tc

- Effects of thermodynamic data uncertainties, oxygen fugacity, concentration-limiting solid

- Updated solubilities have lower means and wider ranges

• Cladding

- Effects of creep rupture and stress corrosion cracking, localized corrosion rate uncertainty, seismic failures, rock overburden failure, unzipping velocity uncertainty

* Colloids

- Simplified model with expanded range, includes reversible and irreversible Pu attachment


Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01.ppt 41

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* Main improvements for the TSPA-SR supplemental EBS flow and transport model are

- Seepage evaporation at the DS

- DS and WP flux models

- In-package diffusion

- Radionuclide sorption


Yucca Mountain Proiect/Preliminarv Predecisional Draft Materials BSC Graohics Presentations YMBlink_08/02/01 .ppt 43I. . . . . - -. . . .. . . .- j -. .. . .-.. ....... ..- . . . . . . . -- _ . ,

Key Flow and Transport Uncertainties

Blink 33.ai

YUCCA MOUNTAIN PROJECT 44Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBIink 08/02/01 .ppt

Key Uncertainty Not Included in Model Improvements Included in Supplemental S&ER Models Discussed in SSPA TSPA Model

Volume 1

Seepage evaporation Yes Yes

Drip shield and waste package fluxes Yes Yes

Drip shield condensation Yes No

Bath-tub flow Yes No

Diffusion in waste package Yes Yes

Diffusion from waste package to invert Yes No

Diffusion through invert Yes Yes

Microbial sorption and transport Yes No

Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt

Impact of Thermal Operating Mode on Engineered Barrier System Transport

* EBS Flow

- Evaporation rates are a function of thermal response

* EBS transport

- Diffusion coefficient is a direct function of temperature

- Diffusion coefficient is a function of the time-dependent saturation

- Adsorption of water vapor is a function of RH


Yucca Mountain Proiect/Preliminarv Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt 45I.. ... .J- . I - I . . . .y • _ _ . ,

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- Absorption of water vapor (condensate thickness)

- Evaporation/condensation fluxes

Negligible difference between HTOM and L TOM because very few WPs fail when temperatures are different

YUCCA MOUNTAIN PROJECT V.,,, . M Iintn n Proiec--f/Preliminanr Pree, n Iio aIDraft IMaxterials R RC .CG ranhics Pr•entation . YMR~link 08/02/101 _nt 47Yucca mouniain rrOjeGTJrrellMlrlaFy r-FeUeL;JblUFldl Uldit IVIULUF]Ulb 00%., %;11 CLPI I JUO F I týWll I LCXLIVIIO- I IVIWII I IRVVIVý/V I PFL

UZ Transport Developments Since TSPA-SR

* Transport times in the drift shadow are orders of magnitude longer than predicted by the existing PA model. The transport times in the drift shadow model are significant relative to the 10,000 year regulatory time frame

* Process model representation of matrix diffusion is conservative due to matrix discretization effects, resulting in shorter predicted breakthrough times. The PA model is conservative relative to the process models over most of the breakthrough curve

* Including the southern extension to the potential repository block results in slightly longer transport times to the water table

* Local dryout from TH processes will delay or reduce radionuclide transport immediately beneath potential waste emplacement drifts for 2000 to 3000 years. Other thermally-driven coupled process effects are expected to have minimal effects on transport


Unsaturated Zone Transport

• Calico Hills peak temperature (~750C HTOM)

- Is not high enough

- For long enough

- For significant zeolite alteration which could change flow patterns or sorption


Yrucca Mntant~in Proi•ct/Preliminarv Predrecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01.pDt 490

S....... r -- i i IT . . .. . .... ........ I . ..7 1 jV U. ... .... l.I.I ... a • .F.I . ......... ................ I

SZ Developments Since TSPA-SR

* New Data

- Lithology of Nye County wells

- Hydraulic head and water level elevations

* New Field Test Results

- Alluvial Testing Complex (ATC) hydraulic measurements

- Preliminary ATC single-well tracer test results

• New Model Analyses (Process model level)

- Alternate conceptual model for Large Hydraulic Gradient

- Alternate representation of Solitario Canyon Fault

YUCCA MOUNTAIN PROJECT Yucca Mountain Proiect/Preliminarv Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01.pot 50

I - -. . - . . . i - . . . I -- -- I I

SZ Developments Since TSPA-SR (Continued)

* New Model Analyses (total system level)

-Dispersion and matrix diffusion analyses

- Sensitivity to flow path length in alluvium

- Sensitivity to reversible colloid model uncertainty

- Location of accessible environment (EPA final rule)

* New Values Used in SSPA

- Bulk density of alluvium

- Sorption coefficients (Tc and I)


Yucca Mountain Proiect/Preliminarv Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01.ppt 51. "- -- -j- I

Biosphere Developments Since TSPA-SR

0 Updated FEPs

0 Relative exposures to receptor groups

• Improved distributions for input factors in External and Inhalation exposure analyses

• Climate effects on water usage & ingestion exposure

0 Improved transfer coefficients (soil to plant, etc.) for Pb, Bi and Po

0 Revised BCDFs

0 Increased GENII-S sample size

• Revised volcanic eruption BDCF analysis

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01 .ot 52I.. . . . . i . . . . . . . . . . . . . . . . . . . . . . .

S........ r ..................... • ........... • ........ rr-

Disruptive Events Developments Since TSPA-SR

* Use of wind speed data that extend to the height of the eruptive column

* New analyses of the probability of dike intrusion, considering changes in layout parameters and alternate models of eruptive center development

* Characterization of uncertainty associated with emplacement drift damage zones due to igneous intrusion

* Evaluation of dose sensitivity to waste particle size distribution in an igneous eruption

YUCCA MOUNTAIN PROJECT Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics Presentations YMBlink 08/02/01 .pot 53o

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• Updated Np solubility- l Ox peak dose decrease

• 1,000,000 year climate model - 1Ox dose variation

* Temperature-dependent general corrosion

- 700,000 year delay in peak dose

- -350,000 year delay in 1 mrem/yr dose rate

* Early failure of a few WPs - dose rate -10-4 mrem/yr


Yucca Mountain Project/Preliminary Predecisional Draft Materials BSC Graphics PresentationsYMBlink_08/02/01 .ppt


Documents

Summary Highlights of NRC/DOE Technical Exchange and ... · DRAFT AGENDA DOE/NRC MEETING ON REPOSITORY THERMAL MANAGEMENT 10:00 A.M. -4:45 P.M. (EDT) August 2, 2001 Room 03B-4 11555