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:
ive Valve Position Verification Approach to Satisfy ISTC-3700 DG-1407, Page 9 2. Conditionally Acceptable OM Code Cases The OM Code Cases listed in Table 2 are acceptable to the NRC for application in applicant’s or licensee’s IST programs within the conditions indicated by the NRC. The OM Code uses two approaches to list revisions of OM Code Cases. The first approach lists OM Code Cases according to edition or addenda (e.g., OMN-6, 2020 Edition). The second approach uses a numbering system (e.g., OMN-1, Revision 1) that states the latest revision number of a Code Case. Thus, the tables below show either the latest edition or addenda in which an OM Code Case was published or the latest revision number of an OM Code Case, in accordance with the requirement in 10 CFR 50.55a that licensees or applicants implement the most recent version of an OM Code Case. The edition and addenda are listed in addition to the revision number because the OM Code in some cases reaffirms OM Code Cases with minor changes. Listing both the revision number and edition or addenda ensures that the latest version of the OM Code Case is implemented. To assist users, new and revised OM Code Cases are shaded in grey to distinguish them from those approved in previous versions of this guide. In Table 2, where an OM Code Case is specified as acceptable for application at nuclear power plants with a Code of Record of any edition or addenda of the OM Code incorporated by reference in 10 CFR 50.55a(a)(1)(iv), applicants and licensees should verify that the OM Code Case is applied to the proper paragraphs in the OM Code edition or addenda specified as the Code of Record for the specific nuclear power plant, because paragraphs might be re-numbered in newer editions or addenda of the OM Code. Table 2. Conditionally Acceptable OM Code Cases Code Case Number Table 2 Conditionally Acceptable OM Code Cases Title/Condition OMN-1 Revision 2 (2022 Edition) Alternative Rules for Preservice and Inservice