Document: NUREG-0800
Document ID: c1650863-1de1-414d-af2a-3303c5a3d208
Document Type: srp
Title: FUNCTIONAL DESIGN, QUALIFICATION, AND INSERVICE TESTING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070720041.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.6
CFR Part: 
CFR Title: 

Content:
-Operated Valves (1) In addition to the IST program requirements in the ASME OM Code incorporated by reference in 10 CFR 50.55a(f), 10 CFR 50.55(b)(3)(ii) requires establishment of a program to ensure that the safety-related MOVs continue to be capable of performing their design-basis safety functions. GL 96-05 provides additional guidance for the periodic verification of MOV design-basis capability. Furthermore, ASME Code Cases OMN-1 and OMN-11, as accepted by the NRC staff with conditions in RG 1.192, provide an alternative method to MOV stroke-time testing that also satisfies the requirement in 10 CFR 50.55a to supplement the OM Code IST provisions with a program to ensure that safety-related MOVs continue to be capable of performing their safety functions. (2) Periodic testing should be conducted that objectively demonstrates continuing MOV capability to perform its safety functions to open and close, as applicable, under design-basis conditions. Where testing is not conducted under design-basis conditions (e.g., under environmental conditions), an analysis combined with test results should demonstrate the continued design-basis capability of the MOV. (3) The interval between testing demonstrating continued design- basis capability should not exceed 5 years or three refueling outages, whichever is longer, unless a longer interval can be justified. Longer design-basis verification intervals may be justified through implementation of ASME Code Case OMN-1, as accepted in RG 1.192. (4) Acceptance criteria for successful completion of the preservice and inservice testing of MOVs should include the following: (a) Consistent with the safety function, the valve should fully open and/or the valve fully close or both. Diagnostic equipment should indicate hard seat contact. 3.9.6-11 Revision 3 - March 2007 (b) The testing should demonstrate adequate margin with respect to the design basis, including consideration of diagnostic equipment inaccuracies, degraded voltage,