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:
Case, to establish an additional reference curve or set of curves, these new curves must be determined in accordance with Section 3. OMN-11 (2001 Edition) (2003 Addenda) (2004 Edition) (2006 Addenda) (2009 Edition) (2012 Edition) (2015 Edition) (2017 Edition) (2020 Edition) Risk-Informed Testing for Motor-Operated Valves Where a licensee is implementing OM Code Case OMN-1 as a justified alternative to the requirements for stroke-time testing of MOVs in Subsection ISTC of the OM Code, the licensee may apply risk insights to its MOV program as indicated in Paragraph 3.7, “Risk-Based Criteria for MOV Testing,” of OMN-1 and as supplemented by OM Code Case OMN 11 with the following conditions: (1) In addition to the IST provisions of Paragraph 3 of OMN-11, MOVs within the scope of OMN-1 that are categorized as LSSCs must satisfy the other provisions of OMN-1, including determination of proper MOV test intervals as specified in Paragraph 6 of OMN-1. (2) Paragraph 3(a) of OMN-11 must be interpreted as allowing the provisions of Paragraphs 3.5(a) and (d) of OMN-1 related to similarity and test sample, respectively, to be relaxed for the grouping of LSSC MOVs. The provisions of Paragraphs 3.5(b), (c), and (e) of OMN-1, related to evaluation of test results for MOVs in the group, sequential testing of a representative MOV, and analysis of test results in accordance with Paragraph 6 of OMN-1 for each MOV in the group, respectively, continue to be applicable to all MOVs within the scope of OMN-1. DG-1407, Page 17 Code Case Number Table 3 OM Code Cases That Have Been Superseded by Revised OM Code Cases Title/Condition (3) When extending exercise test intervals for high-risk MOVs beyond a quarterly frequency, the licensee must ensure that the potential increase in CDF and risk associated with the extension is small and consistent with the intent of the Commission’s Safety Goal Policy Statement. Note 1: The condition on allowable methodologies for MOV risk ranking specified