ML23082A057
| 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 Section III Implementation Approach Propose Alternate Requirements Selection of Construction Code Categorization
& Classification 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 requirementsSection III Implementation Approach Propose Alternate Requirements Selection of Construction Code Categorization
& Classification 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===
Section III Implementation Approach Propose Alternate Requirements Selection of Construction Code Categorization Classification 5
Categorization & Classification, Code Selections Paradigm shift in advanced reactor safety basis from traditional nuclear reactors Categorization processes developed, and some endorsed, that recognize this paradigm shift 6
SSC Categorization Process (e.g., NEI 18-04)
Identify SSC Safety Classifications (e.g., RISC-3, NSRST)
Select Applicable Codes and Standards (e.g.,
Section III Class B,Section VIII Division 2, B31.1)
Categorization & Classification, Code Selections Paradigm shift in advanced reactor safety basis from traditional nuclear reactors Categorization processes developed, and some endorsed, that recognize this paradigm shift 7
SSC Categorization Process (e.g., NEI 18-04)
Identify SSC Safety Classifications (e.g., RISC-3, NSRST)
Select Applicable Codes and Standards (e.g.,
Section III Class B,Section VIII Division 2, B31.1)
Nuclear Codes and Standards do not yet fully recognize advancements in categorization and classification of systems, structures, and components
Proposed ChangesSection III Implementation Approach Propose Alternate Requirements Selection of Construction Code Categorization &
Classification 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 11 2023 Edition Alt. Material Procurement Before 2025 Edition Code Case for Alt. NDE and Testing 2025 Edition NCA Revision
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 12 2023 Edition Alt. Material Procurement Before 2025 Edition Code Case for Alt. NDE and Testing 2025 Edition NCA Revision
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 13 2023 Edition Alt. Material Procurement Before 2025 Edition Code Case for Alt. NDE and Testing 2025 Edition NCA Revision
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
- 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 UT permitted Alt Extent of Piping Exams Valve Test Hold Times Alt to Piping Hydro Class A, Low Temperature X
X Class A, Elevated Temperature X
Class B, Low and Elevated Temperature X
X - limited to moderate energy piping systems X
X - limited to moderate energy piping 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