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:
urization system (ADS), and their associated piping and valves) to perform their intended safety function: (a) Verify design acceptance criteria are met for flow resistance of each CMT injection line, accumulator injection line, IRWST tank injection line, the ADS stage flowpaths and each of the flowpaths from the IRWST to each containment sump, as well as from each containment sump to the reactor. (b) Verify design acceptance criteria are met for operation of the vacuum breakers in the ADS discharge lines. (c) Verify design acceptance criteria are met for operation of at least one of each squib valve size and type including containment recirculation, IRWST injection, and a Stage 4 ADS squib valve. Verify that the squib valve receives a simulated signal at the valve electrical leads that is capable of actuating the valve. Verify, by analysis or other simulated test, that the squib valve flow resistance is consistent with the flowpath resistance. A test fixture with prototypical resistance may be used to simulate the squib valve in the flowpaths being tested. (d) Verify design acceptance criteria are met for operation of the containment sump instrumentation by simulating the containment flood-up water levels. 2 This regulatory guide does not include testing guidance for first-plant-only or first-three-plant-only tests for the AP1000 design. DG-1253, Page 7 (e) Verify design acceptance criteria are met for operation of the CMT level instrumentation during draindown testing of the CMTs. (2) Flow Tests—Hot Conditions. Any planned or unplanned actuation of the PCCS that results in the injection of cold fluid into the hot RCS should be documented in the preoperational test records discussed in Regulatory Position C.3 of this RG. During hot functional PCCS testing, the following should be verified: (a) Verify design acceptance criteria are met for operation of the ADS Stage 1, 2, and 3 components, including the spargers, by blowing down the RCS to the IRWST. (b) Verify