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Level of Detail for Piping Stress AnalysesPiping Stress Analyses

Pre-Application Review Meeting

May 02, 2014

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Non-ProprietaryTable of Contents

I. Introduction

II C t D i A hII. Current Design Approach

III Proposed Design Approach

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III. Proposed Design Approach

IV. Open Discussion

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I I t d tiI. Introduction

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Non-ProprietaryPurpose of Meeting

KHNP needs to better understand the intent of NRC’s recent communications and clarify the scopeNRC s recent communications and clarify the scope of piping design work to be completed for the APR1400 DC application.

NRC has recently revealed its position on the level of detail for piping design in DC application: a heavy

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reliance on DAC may no longer be valid for the APR1400 DC application.

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No comments were identified during the acceptance review of the APR1400 DCD.

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Non-ProprietaryPiping Design Work Flow

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Non-ProprietaryPiping Stress Analysis Work Flow

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II C t D i A hII. Current Design Approach

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Non-ProprietaryApplication of DAC to Piping Stress Analysis KHNP has applied DAC to piping stress analysis based on the following

NRC guidance: SECY 92-053 “Use of design acceptance criteria during 10 CFR Part 52 design

tifi ti i ”certification reviews” RG 1.206 C.III.5 “Design Acceptance Criteria” RG 1.215 “Guidance for ITAAC Closure Under 10 CFR Part 52” NEI 08-1 “Industry Guideline for the ITAAC Closure process Under 10 CFR Part

52”52

Completion of piping design based on the reference plant(SKN3&4) design is impractical due to the following reasons: Higher Seismic Loads

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Higher Seismic Loads Unavailability of Vendor Information Change of General Arrangement Change of ASME Code Edition

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To enable NRC safety determination, DAC & ITAAC has been identified in DCD Tier 1, Table 2.3 & 2.4 with two sample calculations.

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Non-ProprietarySummary of Piping Design Level of Detail

Class Scope DesignC l ti

Sample C l l ti

DAC Cl ITAACClass Scope Completion Calculation Closure ITAAC

RCS Piping Primary Stress

ASME Class 1 RCS

Branch DAC One S b t COL

Tier 1 Table 2.4.2-4,

2 4 4 7 4

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Branch Piping

DAC Subsystem COL 2.4.4~7-4

ASME

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All Piping DAC One Subsystem COL Tier 1 Table

2.3-1

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Non-ProprietarySample Calculation

Two representative piping systems were selected for sample calculations.

Di t l i j ti t f t l t Direct vessel injection system from reactor vessel to containment penetration – SI101(Class 1&2)

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Non-ProprietarySample Calculation (Cont’d)

Feedwater system from steam generator to containment penetration – FW101(Class 2)p ( )

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Non-ProprietarySample Calculation Conformance Table with regard to DCD 3.12g

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Non-ProprietarySample Calculation Conformance Table with regard to DCD 3.12 (Cont’d)g ( )

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Non-ProprietarySample Calculation Conformance Table with regard to DCD 3.12 (Cont’d)g ( )

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III P d D i A hIII. Proposed Design Approach

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Non-ProprietaryApplication of Graded ApproachKHNP would like to suggest a graded approach as follows:

High Safety Significant Piping High Safety Significant Piping All class 1 piping MS & FW lines to the first 6-way rigid restraint beyond the isolation valves Piping systems design and stress analyses will be completed except for

i t l f ti l tienvironmental fatigue evaluation

Lower Safety Significant Piping Class 2&3 piping selected by Expert Panel through the failure mode &

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Class 2&3 piping selected by Expert Panel through the failure mode & effect analysis(FMEA) based on pipe hazard analysis of SKN 3&4 and safety significance of each piping.

• Detailed method and procedure of selecting class 2&3 piping will be proposed in the next PARM. A li f Cl 2&3 i i k dd h i i DAC ill b id d i

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• The selected packages provide NRC with sufficient information to make a safety determination for resolving DAC.

Design documents and drawings will be prepared.

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Design documents and drawings will be prepared. Piping stress analyses will be performed by COL applicants

Non-ProprietaryPiping Design Scope of Work to be Completed

DescriptionDocuments/ D i

CurrentS

Forecast d

Class 1 Class 2&3Description / Drawings Status date >1” ≤2” ≥2.5”

Functional design criteria for mechanical systems andcomponents

System DesignCriteria (SDC)

Issued for DC Completed x x x

components

Preliminary system design description

System FunctionalDescription (SFD)

Issued for DC Completed x x x

Piping design methodology

DCD Tier 2, ch3.12 Issued for DC Completed x x x

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Simplified piping & instrumentationdiagrams

Piping & Instrument Diagram (P&ID)

Issued for DC Completed x x

Process flow diagrams DCD Tier 2 Issued for DC Completed x x

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Key piping parameters Piping Design Table (PDT)Line Index

Issued for DC

Not issued

Completed

12/2014

x

x

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Non-ProprietaryPiping Design Scope of Work to be Completed (cont’d)

DescriptionDocuments Current Forecast Class 1 Class 2&3

( )

Description / Drawings Status date >1” ≤2” ≥2.5”

Plant layout and arrangement information

• GA Drawings

• Piping Isometric d i

Issued for DC

27 piping S b t

Completed

12/2015 (for th )

x

x

x

x1

drawing Subsystems connected to major components

others)

Design specifications • Valve specification Not issued 12/2014 x

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for major components connected to piping systems

• Pump specification

12/2014 x

Preliminary piping stress analyses

• Summary report for class 1, 2&3

Two sample calculations

12/2015 x x2

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• Design report for Class 1

12/2015(excluding environmental fatigue)

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1. For Lower Safety Significant piping2. For MS & FW piping to the first 6-way rigid restraint beyond the isolation valves

Non-ProprietaryDocuments/Drawings Development

For For Class 1 Class 2&3 Documents/ Drawings For

reviewFor

audit&

>1” ≤2” ≥2.5”

Design reports for Class 1 piping1 x xg g

Summary report s of stress analysis results for class 1, 2&3 piping (TeR) 1 x x x2

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Piping isometric drawings x x x3

Line Index x x x2

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1. Excluding environmental fatigue evaluation2. For MS & FW piping to the first 6-way rigid restraint beyond the isolation valves

Valve/Pump Specifications x x

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3. For Lower Safety Significant piping

Non-ProprietaryClarification Items

In the class 1 piping analysis can the In the class 1 piping analysis, can the environmental fatigue evaluation be left as a COL item ? NUREG/CR-6909(RG 1.207) is under revision. ASME Codes & Standards have not been developed

yet

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IV O Di iIV. Open Discussion

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THANK YOUTHANK YOUTHANK YOUTHANK YOU

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