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:
Vs 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 3.9.6-7 DRAFT Rev. 3 - April 1996 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 MOV. All safety-related MOVs should be considered in the development of the program. Valve performance and maintenance should be monitored with appropriate adjustments to the program.65 (b) The surveillance interval for the inservice testing described in subsection II.2.c(2) should not exceed 5 years or three refueling outages, whichever is longer, unless a longer interval can be justified. (c) After testing, adjustments to control switch settings, as well as any other repairs, adjustments, and maintenance, should be made to the particular MOV, if necessary. The applicability of these repairs, adjustments, and maintenance to other MOVs should be considered. Common mode and common cause failure mechanisms should also be considered. (d) Remote position indication should be verified, if applicable. (e) A list of deficiencies, misadjustments, and degraded conditions that have been discovered in existing MOVs is attached as Appendix A to this SRP section. The applicant's inservice testing program and procedures for MOVs should be established and maintained to account for and minimize such deficiencies, misadjustments, and degraded conditions. (3) Acceptance criteria for successful completion of the preservice and inservice testing of MOVs described in subsection II.2.c(1) and (2) should include the following: (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