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:
orous than provided for high risk-significant valve assemblies. (7) Paragraph 5.4, “Evaluations,” of OMN-12, specifies evaluations to be performed of pneumatically and hydraulically operated valve assemblies categorized as low safety significant within the scope of the OM Code Case. Initial and periodic diagnostic testing must be performed to establish and verify the setpoints of these valve assemblies to ensure that they are capable of performing their design-basis safety functions. Methods for testing and establishing test frequencies may be less rigorous than applied to high risk-significant valve assemblies. (8) Paragraph 5.6, “Corrective Action,” of OMN-12 specifies that corrective action must be initiated if the parameters monitored and evaluated for pneumatically and hydraulically operated valve assemblies categorized as low safety significant within the scope of the OM Code Case do not meet the established criteria. Further, if the valve assembly does not satisfy its acceptance criteria, the operability of the valve assembly must be evaluated. Note 1: Applicants and licensees are cautioned that, when implementing OMN-12, the benefits of performing a particular test should be balanced against the potential adverse effects placed on the valves or systems caused by this testing. DG-1407, Page 13 Code Case Number Table 2 Conditionally Acceptable OM Code Cases Title/Condition Note 2: Paragraph 3.1 of OMN-12 states that “Valve assemblies shall be classified as either high safety significant or low safety significant in accordance with Code Case OMN-3.” This note as well as Note 2 to OMN-4 have been added to ensure the consistent consideration of risk insights. Note 3: The conditions are identical to those imposed on OMN-12 in previous revisions to RG 1.192. OMN-19 (2022 Edition) Alternative Upper Limit for the Comprehensive Pump Test Applicants or licensees who use this OM Code Case must implement a pump periodic verification test program. A pump