Document: NRC Regulatory Guide
Document ID: 3b4c5897-7060-42e3-83a9-cf0790b7dc60
Document Type: regulatory_guide
Title: Acceptability of ASME Code, Section XI, Division 2, Requirements for RIM Programs for NPPs, for Non-LWRs
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2112/ML21120A185.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.246
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CFR Title: 

Content:
e, degradation mechanisms, and reliability targets for the in-scope SSCs; identification and evaluation of RIM strategies and uncertainties; program implementation; performance monitoring; and program updates to be applied for passive components to give assurance that the reliability will meet preestablished targets (developed from the PRA information for the facility). ASME Code, Section XI, Division 2, does not stipulate any specific strategies to be employed but calls for these to be developed by expert panels, considering types of examinations currently used for ASME Code, Section XI, Division 1, and known or potential degradation mechanisms for typical materials used in the construction of nuclear facilities. The acceptance criteria used in Appendix VII to ASME Code, Section XI, Division 2, are based on the acceptance criteria in ASME Code, Section XI, Division 1. The NRC staff reviewed the 2019 Edition of ASME Code, Section XI, Division 2, to determine whether the code is an acceptable approach to developing a RIM program for non-LWRs. Because ASME Code, Section XI, Division 1, provides requirements for a PSI and ISI program for an LWR, the scope of this RG focuses on non-LWRs. The discussions below summarize the NRC staff’s observations about ASME Code, Section XI, Division 2, and the potential issues or concerns that may arise through its implementation. These observations led to conditions that are identified in Section C of this RG that should be applied to the use of ASME Code, Section XI, Division 2 for non-LWRs. DG-1383, Page 6 Bases for NRC Staff Regulatory Guidance Positions The following items discuss the basis for the NRC staff’s positions stated in Section C of this RG on potential issues or concerns when implementing ASME Code, Section XI, Division 2 for non-LWRs. Basis for Regulatory Guidance Position 1 Since current regulations specifying standards to be used for preservice and inservice inspection programs are only applicable to light water