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:
testing should be performed under temperature and flow conditions which 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. 3.9.6-11 DRAFT Rev. 3 - April 1996 (c) Test results should identify the flow required to open the valve to the full-open position. (d) Testing should include the effects of rapid pump starts and stops, as required for expected system operating conditions. The testing should include any other reverse flow conditions which may be required by expected system operating conditions. (2) In addition to the inservice testing described in subsection II.2.b, nonintrusive (diagnostic) techniques. as described in subsection II.2.e(1)(a) should be used to periodically assess degradation and the performance characteristics of check valves. (3) Acceptance criteria for successful completion of the preservice and inservice testing of check valves described in subsections II.2.e(1) and (2) should include the following: (a) During all test modes which 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) Leaktightness of the valve, when fully closed, should be within established limits. (c) Valve disk positions should be determinable without disassembly. (d) Testing should verify that there is free disk movement to and from the seat. (e) The valve disk should be stable in the open position under normal and other required system operating fluid flow conditions. (f) The valve should be correctly sized for the flow conditions specified (i.e., the disk is in full open position at normal full flow operating condition). (g) Valve design features, material, and surfaces should accommodate nonintrusive diagnostic testing methods available in the industry or as specified. (h) Piping system design features