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:
tance criteria and include performance of void transport analysis. The evaluation should document the rationale and determination that gas intrusion into the ECCS system would not adversely affect the ability of the system to perform its function. If noncondensable gases are vented through high-point vent valves, verify closure of the valves before starting the ECCS pumps. The test program should also include prerequisite tests for motor and steam operated pump capabilities and motor and air operated valve actuation times. This testing should be performed under the most limiting design basis conditions and may be verified by either testing or analyses. 1. System Testing The preoperational testing of the ECCS should include the tests described below. a. High-Pressure Safety Injection (Current Fleet of PWRs and US-APWR) The preoperational test program should test each train of the High Pressure Safety Injection (HPSI) under both cold and simulated hot operating conditions before fuel loading. The tests below should verify all critical parameter acceptance criteria that are required for HPSI to meet its design basis. (1) Flow Test—Cold Conditions. The reactor vessel may be open and flooded with the reactor coolant system (RCS) pressure at essentially atmospheric (zero gauge pressure) conditions. No attempt is made to control the temperature of the water in the storage tank or in the accumulators. This test demonstrates system and component capability by injecting water1 from the water storage tank into the reactor vessel through various combinations of injection legs and pumps. (a) This test should be initiated by the safety injection signal with affected auxiliary systems in their standard operating mode. (b) Testing should demonstrate that flow rates delivered through each injection flow path using all pump combinations are within the design specifications. Proper system activation time and sequencing should also be verified. Those plants that use this scheme to