Document: NRC Regulatory Guide
Document ID: c256f223-ee35-43e0-82e7-aa7b14469259
Document Type: regulatory_guide
Title: Preoperational Testing of Emergency Core Cooling Systems for Pressurized Water Reactors + HISTORY - HISTORY DG-1253 , Proposed Revision 2 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1101/ML110110480.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.79
CFR Part: 
CFR Title: 

Content:
mal shock to the piping and reactor vessel as a result of the hot injection test of the HPSI. (b) This test should verify the capability of all HPSI pumps to deliver water as required under postulated accident conditions, based on as-built HPSI pumps and system head-capacity curves. In addition, proper operation of the motor operated valves and check valves should be verified. b. Medium-Pressure Safety Injection (Westinghouse Four-Loop PWRs, U.S. EPR) The preoperational test program should test the performance of critical components of the medium-pressure safety injection (MPSI) system (for those plants so equipped) under cold and simulated hot operating conditions before fuel loading. (1) Flow Test—Cold Conditions. Flow testing of the MPSI system should be conducted in a manner similar to that for the HPSI system (see Regulatory Position C.1.a(1) above). (2) Recirculation Test—Cold Conditions. If MPSI can be used to directly take suction from the containment sump, the recirculation test discussed in Regulatory Position C.1.c(2) below should be performed. (3) Flow Test—Hot Conditions. Flow testing of the MPSI system should be conducted in a manner similar to that for the HPSI and LPSI system (see Regulatory Positions C.1.a(2) and C.2.c.(2)). c. Low-Pressure Safety Injection (LPSI) (Current Fleet of PWRs, US-APWR, U.S. EPR) (1) Flow Test—Cold Conditions. Flow testing of the LPSI system should be conducted in a manner similar to that for the HPSI system (see Regulatory Position C.1.a(1) above). (2) Recirculation Test—Cold Conditions. This test should demonstrate the ability of the injection pumps to recirculate cooling water from the containment floor or sump into the RCS and should cover any aspects of the design where both ECCS trains utilize a common component such as a containment emergency sump. This test should also demonstrate the capability to realign the valves for recirculation mode. (a) Testing should verify proper vortex control in the suction