Document: NRC Regulatory Guide
Document ID: 7d480029-59df-44fe-9db8-c1c86566dac9
Document Type: regulatory_guide
Title: Operation and Maintenance Code Case Acceptability, ASME OM Code (Rev. 5)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2219/ML22196A063.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.192
CFR Part: 
CFR Title: 

Content:
. OMN-2 (1998 Addenda) (2001 Edition) (2004 Edition) (2009 Edition) (2012 Edition) Thermal Relief Valve Code Case, OM Code-1995, Appendix I (Note: This OM Code Case was annulled in the 2017 Edition of the OM Code.) OMN-3 (1998 Edition) (2001 Edition) (2002 Addenda) (2004 Edition) (2009 Edition) (2012 Edition) (2015 Edition) (2017 Edition) (2020 Edition) Requirements for Safety Significance Categorization of Components Using Risk Insights for Inservice Testing of LWR Power Plants (1) In addition to those components identified in the ASME IST Program Plan, implementation of Section 1, “Applicability,” of the Code Case must include within the scope of a licensee’s risk- informed IST program non-ASME Code components categorized as high safety significant components (HSSCs) that might not currently be included in the IST Program Plan. (2) The decision criteria discussed in Section 4.4.1, “Decision Criteria,” of the Code Case for evaluating the acceptability of aggregate risk effects (i.e., for Core Damage Frequency [CDF] and Large Early Release Frequency [LERF]) must be consistent with the guidance provided in Regulatory Guide 1.174, “An Approach for Using Probabilistic Risk Assessment in Risk- DG-1407, Page 15 Code Case Number Table 3 OM Code Cases That Have Been Superseded by Revised OM Code Cases Title/Condition Informed Decisions on Plant-Specific Changes to the Licensing Basis.” (3) Section 4.4.4, “Defense in Depth,” of the Code Case must be consistent with the guidance contained in Sections 2.2.1, “Defense-in-Depth Evaluation,” and 2.2.2, “Safety Margin Evaluation,” of Regulatory Guide 1.175, “An Approach for Plant-Specific, Risk-Informed Decisionmaking: Inservice Testing.” (4) Implementation of Sections 4.5, “Inservice Testing Program,” and 4.6, “Performance Monitoring,” of the Code Case must be consistent with the guidance pertaining to inservice testing of pumps and valves provided in Section 3.2, “Program