ML23082A057

Proposal to Establish Alternate Requirements for Components Commensurate with Safety and Risk

ML23082A057
Person / Time
Site:	Nuclear Energy Institute
Issue date:	03/28/2023
From:	Basso T, Mckillop S ASME Board on Nuclear Codes and Standards, MPR Associates, Nuclear Energy Institute
To:	Office of Nuclear Reactor Regulation
References
Download: ML23082A057 (1)

Text

Proposal to Establish Alternate Requirements for Components Commensurate with Safety and Risk NRC Public Meeting March 28, 2023 Tom Basso, Nuclear Energy Institute Suzanne McKillop, MPR Associates

Introduction

Purpose:

Discuss the technical basis for proposed alternate requirements for the construction of ASME Section III nuclear items commensurate with an items contribution to safety or risk Selection of Propose Section III Categorization Construction Alternate Implementation

& Classification Code Requirements Approach 2

Introduction Desired Outcome:

Open and interactive discussion of viewpoints on technical basis and Section III approach to rules for these items, specifically focused on alternate examination and testing requirements Categorization Selection of Propose Section III

& Classification Construction Alternate Implementation Code Requirements Approach 3

Section III Approach Summary

• Section III is developing alternative requirements commensurate with an items contribution to safety and risk (e.g., NEI 18-04)

- Results in increased value for construction

- Aligned with the design needs of advanced reactors 4

Background

Categorization Selection of Propose Section III

& Construction Alternate Implementation Classification Code Requirements Approach 5

Categorization & Classification, Code Selections

• Paradigm shift in SSC Categorization advanced reactor safety Process (e.g., NEI 18-04) basis from traditional nuclear reactors Identify SSC Safety

• Categorization processes Classifications (e.g., RISC-3, developed, and some NSRST) endorsed, that recognize this paradigm shift Select Applicable Codes and Standards (e.g.,

Section III Class B,Section VIII Division 2, B31.1) 6

Categorization & Classification, Code Selections

• Paradigm shift in SSC Categorization advanced reactor safety Process (e.g., NEI 18-04) basis from traditional nuclear reactors Nuclear Codes andIdentify Standards do not yet fully SSC Safety recognize

• Categorization advancements processes in categorization Classifications (e.g., RISC-3, and developed,classification and some NSRST) structures, and of systems, endorsed, that recognize components this paradigm shift Select Applicable Codes and Standards (e.g.,

Section III Class B,Section VIII Division 2, B31.1) 7

Proposed Changes Categorization & Selection of Propose Section III Classification Construction Alternate Implementation Code Requirements Approach 8

Proposed Alternate Requirements

• Provide a new construction option commensurate with an items contribution to safety and risk via alternative requirements within Section III that:

Uses design rules developed specifically for nuclear applications AlignsSection III construction requirements with typical industrial codes Technical Basis:

- Nuclear design rules are already used in nuclear applications

- Construction of low safety significant items to industrial code requirements is already permitted (e.g., 10CFR50.69) 9

Proposed Alternate Requirements

• Materials, Fabrication, and Examination Requirements

- Code revisions for alternate material procurement

- Code Case to permit alternate methods for NDE and testing

• Quality Requirements

- Subsection NCA revision for alternate quality requirements 10

Implementation Approach

• Materials, Fabrication, and Examination Requirements

- Code revisions for alternate material procurement

- Code Case to permit alternate methods for NDE and testing

• Quality Requirements

- Subsection NCA revision for alternate quality requirements 2023 Edition Before 2025 2025 Edition Edition Alt. Material Code Case for NCA Revision Procurement Alt. NDE and Testing 11

Implementation Approach

• Materials, Fabrication, and Examination Requirements Code revisions for alternate material procurement

- Code Case to permit alternate methods for NDE and testing

• Quality Requirements

- Subsection NCA revision for alternate quality requirements 2023 Edition Before 2025 2025 Edition Edition Alt. Material Code Case for NCA Revision Procurement Alt. NDE and Testing 12

Implementation Approach

• Materials, Fabrication, and Examination Requirements Code revisions for alternate material procurement Code Case to permit alternate methods for NDE and testing

• Quality Requirements

- Subsection NCA revision for alternate quality requirements 2023 Edition Before 2025 2025 Edition Edition Alt. Material Code Case for NCA Revision Procurement Alt. NDE and Testing 13

Optional or Alternate Methods for NDE and Testing

• Record 23-15: Code Case to permit additional NDE and Testing Approaches

- Modified original code case from Record 21-1257

• Scope limited to only Division 5 technical requirements for alternate methods for NDE and testing

• Scope:

- Section III Division 5

• Class A Low Temperature and Elevated Temperature (Subsection HB)

• Class B Low Temperature and Elevated Temperature (Subsection HC)

• Supports, Low Temperature (Subsection HF) 14

Optional or Alternate Methods for NDE and Testing

• Examination rules

- Option to perform UT

• Permit UT as an option for NDE

- Extent of examinations for moderate energy piping

• Permit progressive random sampling for examinations

• Testing rules

- Alternate hold times for valve shell hydrostatic and valve closure tests

• Permit hold times consistent with B16.34 hold times

- Alternate hydrostatic test rules for moderate energy piping

• Permit service leak test as an option consistent with ASME B31.3 Category D fluid system 15

Optional or Alternate Methods for NDE and Testing Alt Extent of Valve Test Alt to Piping UT permitted Piping Exams Hold Times Hydro Class A, Low X X Temperature Class A, Elevated X Temperature X - limited to X - limited to Class B, Low moderate moderate and Elevated X X energy piping energy piping Temperature systems systems Supports X 16

Future Section III Engagement Code Case N-883 Updates to Seismic Rules Alternate QA Requirements Commensurate with an Items Contribution to Safety and Risk Ultrasonic Examinations During Construction Requirement for Code Case on Class 2/3 Small Piping Alternate 17