Document: NUREG-0800
Document ID: 217aa53e-c4ac-4a8f-b1b6-968ad75d68ab
Document Type: srp
Title: INSERVICE TESTING OF PUMPS AND VALVES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070368.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.6
CFR Part: 
CFR Title: 

Content:
in subsection II.2.d(2). A risk-based approach may be used to prioritize valve test activities, such as frequency of individual valve tests and selection of valves to be tested. The valve test program should ensure that safety-related POVs will remain operable until the next scheduled test. The importance of the valve should be considered in determining an appropriate mix of exercising and diagnostic testing. In establishing the mix of testing, consideration should be given to the benefits (such as identification of decreased thrust output and increased thrust requirements) and potential adverse effects (such as accelerated aging or valve damage) when determining the appropriate type of testing for each safety-related POV. All safety-related POVs should be considered in the development of the program. Valve performance and maintenance should be monitored with appropriate adjustments to the program.67 (b) The surveillance interval for the inservice testing described in subsection II.2.d(3) should not exceed 5 years or three refueling outages, whichever is longer, unless a longer interval can be justified. (c) After testing, adjustments and maintenance should be made to the particular POV, if necessary. The applicability of these repairs, adjustments, and maintenance to other POVs should be considered. Common mode and common cause failure mechanisms should be considered. (d) Remote position indication should be verified, if applicable. (4) Acceptance criteria for successful completion of the preservice and inservice testing of POVs described in subsections II.2.d(2) and (3) should include the following: DRAFT Rev. 3 - April 1996 3.9.6-10 (a) As required by the safety function, the valve must fully open and/or the valve must fully close. Diagnostic equipment must indicate hard seat contact. (b) The POV testing must demonstrate adequate margin to achieve design requirements, including consideration of diagnostic equipment inaccuracies, margin for degradation, degraded