NRC Activities for

Aging Management and

Storage Renewals

Aladar Csontos, Ph.D

Chief, Renewals & Materials Branch

January 13, 2016

1

2

Storage Renewal Surge

Peak

17 S

ites

35 S

ites

2 S

ites

3 S

ites

3 S

ite

s

1S

ite

Steady

2021-2025

Updated Guidance Infrastructure

Key to Managing Workload

• Staff experience with storage renewal reviews

• Established NRC team to assess guidance needs

• Operations-focused approach for renewals and aging

management, that is learning, proactive, and responsive

– Based on achievable operational methodologies

– Condition based monitoring and/or inservice inspections (ISI)

based on technically defensible criteria

– Assessment of monitoring and ISI findings and data

– Criteria for action (no action, repair, replace, other mitigation)

– Aggregate, trend, and report operating experience (OpE)

– Learning AMPs that consider and respond to OpE

3

Updated Storage Renewal

Guidance Framework

RG

NEI 14-03

TI / IP

Inspections

Infrastructure for Updated Storage

Renewal Guidance Framework

DOE/ANL

Report

MAPS

NUREG

SRP 1927R1

NEI

14-03

Storage/

Reactor

OpE

Technical

Issue

Resolution

Managing Aging

Processes in Storage

(MAPS) Report

NUREG-###Staff consideration of

Stakeholder inputs

SRP

NUREG-

1927R0

Consensus

Codes

Temporary

Instructions &

AMA

Inspection

Procedures

Regulatory

Guide

For Possible

NEI 14-03

Endorsement

• Stable, predictable, reliable, and consistent NRC reviews

• Clear, open, and transparent regulatory expectations

• Efficient review process

NUREG-1927R1

Staff Guidance

MAPS: AMPs/TLAAs

NEI-14-03: Operations-

based Aging Management

Operational Experience

Inspection Findings

Relevant Research Results

Consensus CodesIn

form

Updated Storage Renewal

Guidance Infrastructure Goals

High Quality

LR Applications

• Stable, predictable, reliable, and consistent NRC reviews

• Clear, open, and transparent regulatory expectations

• Efficient review process

NUREG-1927R1

Staff Guidance

MAPS: AMPs/TLAAs

NEI-14-03: Operations-

based Aging Management

Operational Experience

Inspection Findings

Relevant Research Results

Consensus CodesIn

form

Updated Storage Renewal

Guidance Infrastructure Goals

High Quality

LR Applications

Learning, Proactive,

Responsive,

Operations-based

Aging Management

• Stable, predictable, reliable, and consistent NRC reviews

• Clear, open, and transparent regulatory expectations

• Efficient review process

NUREG-1927R1

Staff Guidance

MAPS: AMPs/TLAAs

NEI-14-03: Operations-

based Aging Management

Operational Experience

Inspection Findings

Relevant Research Results

Consensus CodesIn

form

Updated Storage Renewal

Guidance Infrastructure Goals

High Quality

LR Applications

NRC Regional

Oversight Inspections:

Aging Management

Implementation

• NRC guidance infrastructure development:– NUREG-1927, Rev. 1 (SRP for Storage Renewals)

– Managing Aging Processes for Storage (MAPS)

– Inspector guidance of licensees’ aging management activities

– Regulatory Guide that discusses guidance framework and is a

vehicle for potential endorsement of industry guidance

• External stakeholder infrastructure development:

– Consensus ASME Boiler and Pressure Vessel Code Section XI

Code Case for ISI of dry cask storage canisters

– Consensus ACI Guide for ISI of concrete storage overpacks

– NEI 14-03, Rev.1 “Format, Content & Implementation Guidance

for Dry Cask Storage Operations-Based Aging Management”

– Development of in-situ NDE capabilities8

Infrastructure for Updated Storage

Renewal Guidance Framework

• Operations-Focused Aging Management Framework:

– Inspections/Surveillance

– Assessments to Acceptance Criteria

– No Action or Corrective Action (Repair/Replace/Mitigate)

– Collection, assessment, & dissemination of operational experience

• Example AMPs in NUREG-1927 Revision 1 Appendix B:

– Localized Corrosion and Stress Corrosion Cracking of Welded

Stainless Steel Dry Storage Canisters

– Reinforced Concrete Structures

– High Burnup Fuel Monitoring Program

• Revised guidance on Lead System Inspection for

Storage Renewals in Appendix C

9

Updated Storage Renewal

Framework NUREG 1927 Rev. 1

• Path Forward:

– Published draft guidance for public comment (July 2015)

– Address public comments and finalize guidance

– Engage ACRS on final guidance (March & April 2016)

– Publish final guidance (Summer 2016)

– Continue stakeholder engagement with public meetings

– Continued engagement on NEI 14-03

• Download Availability:

– http://www.nrc.gov/reading-rm/doc-

collections/nuregs/staff/sr1927/r1/

1

0

Updated Storage Renewal

Framework NUREG 1927 Rev. 1

Managing Aging Processes for

Storage (MAPS) Report

• Provide an acceptable generic approach to the

identification of credible aging effects in dry storage

systems and appropriate aging management activities

– Descriptions of storage systems

– Technical bases for determining credible aging effects

– System-specific tables of subcomponents, their environments,

and aging effects

– Example aging management programs

• Comparable to NUREG-1801 (Generic Aging Lessons

Learned Report) for the renewal of reactor licenses

• Increase efficiency by allowing the staff to focus review in

areas where applicants propose an alternative approach

11

MAPS, Inspection Guidance, and

Regulatory Guide for Endorsements

• Path Forward for MAPS:

– Draft Rev. 0 deliverable December 31, 2015

– Engage ACRS on draft guidance (May 2016)

– Publish draft guidance for public comment (June 2016)

– Address public comments and finalize guidance

– Engage ACRS on final guidance (Summer 2017)

– Publish final guidance (Summer 2017)

– Stakeholder engagement: public meetings

• Path Forward for TI/IP and Reg Guide:

– Under development12

ASME Section XI

Code Development

• NRC requested ASME to develop consensus code case

• Leverage extensive experience to develop methodology to inspect,

assess, & require corrective actions (repair, replace, and/or mitigate)

• ASME Section XI created a new Task Group on ISI of Spent Fuel

Storage and Transportation Containments

– Inaugural Meeting April 27, 2015

– All 4 vendors participated along with licensees and DOE

• NDE ISI technical criteria, frequency, & protocol development

– Applicable techniques ‒ Sampling/frequency protocol

– Qualification requirements ‒ Demonstration methodology

• Acceptance Criteria/Aging Assessment Methodologies:

– Flaw Evaluation procedures (CISCC)

– General / localized / crevice corrosion assessment methodologies

13

IAEA Guidance Development

• Coordinated Research Project on “Ageing Management Programmes for Dry Storage Systems”

– Share international operating experience and best practices for managing aging effects (3 yearly meetings)

– Outcome: IAEA guidance document for the development of aging management programs for dry storage systems

– Organized by a “consultancy” made up of representatives from the U.S. (NRC, Sandia, NWTRB), Germany, Japan, and the UK

– Status: Call for participants is open

– Proposals due Spring 2016

• Point of Contact:

– Paul Standring, International Atomic Energy Agency

– Email: P.Standring@iaea.org

– (+43-1) 2600-22470

14

References

• NUREG-1927, Rev. 1, Standard Review Plan for Renewal of Specific Licenses and

Certificates of Compliance for Dry Storage of Spent Nuclear Fuel,

http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1927/r1/

• Format, Content and Implementation Guidance for Dry Cask Storage Operations

Based Aging Management, NEI 14-03, September 2015. (NRC ADAMS Accession

No.: ML15272A332) – NOTE: Not yet endorsed by NRC.

• 2015 Regulatory Information Conference: http://www.nrc.gov/public-

involve/conference-symposia/ric/past/2015/docs/abstracts/sessionabstract-12.html

– Darrell Dunn: Incorporating Inspection Data and Operating Experience into Aging

Management Programs

– Ricardo Torres: NUREG-1927, Rev. 1, SRP for Renewal of Specific Licenses and Certificates

of Compliance for Dry Storage of Spent Nuclear Fuel

• 2014 Division of Spent Fuel Management Regulatory Conference:

http://www.nrc.gov/public-involve/conference-symposia/dsfm/dsfm-reg-conf-2014.html

– Ricardo Torres: NUREG-1927, Rev. 1

– Darrell Dunn: Aging Management Programs

– Marlone Davis: Storage System Inspection for Renewals

– Brian Gutherman: NEI 14-03

References

• Susceptibility Assessment Criteria for CISCC of Welded Stainless Steel Canisters for

Dry Cask Storage Systems, EPRI-3002005371, September 2015.

• Failure Modes and Effects Analysis (FMEA) of Welded Stainless Steel Canisters for

Dry Cask Storage Systems, EPRI-3002000815, December 2013.

• Literature Review of Environmental Conditions and Chloride-Induced Degradation

Relevant to Stainless Steel Canisters in Dry Cask Storage Systems, EPRI-

3002002528, May 2014.

• Flaw Growth and Flaw Tolerance Assessment for Dry Cask Storage Canisters, EPRI-

3002002785, October 2014.

• NRC Information Notice 2011-04: Contaminants And Stagnant Conditions Affecting

Stress Corrosion Cracking In Stainless Steel Piping In Pressurized Water Reactors

(ML103410363) February 23, 2011.

• NRC Information Notice 2012-20: Potential Chloride-Induced Stress Corrosion

Cracking Of Austenitic Stainless Steel and Maintenance Of Dry Cask Storage System

Canisters (ML12319A4400) November 14, 2012.

• NRC Information Notice 2013-18: Refueling Water Storage Tank

Degradation (ML 13128A118) September 13, 2013.

References

• A. Kosaki, “Evaluation method of corrosion lifetime of conventional stainless steel

canister under oceanic air environment,” Nuclear Engineering and Design Vol. 238,

pp. 1233–1240, 2008.

• Identification and Prioritization of the Technical Information Needs Affecting Potential

Regulation of Extended Storage and Transportation of Spent Nuclear Fuel -

ML14043A402

• Assessment of Stress Corrosion Cracking Susceptibility for Austenitic Stainless Steels

Exposed to Atmospheric Chloride and Non-Chloride Salts - ML14051A417

• Cladding Stress during Extended Storage of High Burnup Spent Nuclear Fuel -

ML15180A411

• Thermal Analysis of Horizontal Storage Casks for Extended Storage Applications -

ML14352A098

• Extended Storage and Transportation: Evaluation of Drying Adequacy - ML13169A039

• Overview of Vacuum Drying Methods and Factors Affecting the Quantity of Residual

Water after Drying - ML13192A125

• Vacuum Drying Test Plan - ML13192A127

• Available Methods for Functional Monitoring of Dry

Cask Storage Systems - ML14323A067