Document: NUREG-0800
Document ID: f0ec8180-bdec-47b1-b10f-926bce888716
Document Type: srp
Title: FUNCTIONAL DESIGN, QUALIFICATION, AND INSERVICE TESTING PROGRAMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1613/ML16134A116.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.6
CFR Part: 
CFR Title: 

Content:
d be used, if practical, for preoperational testing and later during IST. The equipment and its operating principles should be described and the techniques justified. The operation and accuracy of the test equipment and techniques should be verified during preoperational testing. (b) To the extent practical, testing should be performed under temperature and flow conditions that would exist during normal operation as well as cold shutdown. Testing at temperature and flow conditions that may exist in other modes should also be conducted if such conditions are significant. 3.9.6-23 Revision 4 – March 2017 (c) Test results should identify the minimum flow that will open the valve to the full-open position. (d) Testing should include the effects of rapid pump starts and stops, as expected for system operating conditions. The testing should include any other reverse flow conditions that may occur during expected system operating conditions. (2) Nonintrusive techniques should be used to periodically assess degradation and the performance characteristics of check valves. (3) Acceptance criteria for the successful completion of the preservice and inservice testing of check valves should include the following: (a) During all test modes that simulate expected system operating conditions, the valve disk should fully open or fully close as expected based on the direction of the differential pressure across the valve. (b) Valve disk positions should be determinable without disassembly. (a) Testing should verify that there is free disk movement to and from the seat. (b) The valve disk should be stable in the open position under normal and other minimum system operating fluid flow conditions. (c) For passive plant designs, testing should verify that the valve disk moves freely off the seat under normal and other minimum expected differential pressure conditions. (4) In 10 CFR 50.55a(b)(3)(iv), the regulations specify conditions for the voluntary application of Appendix II,