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:
proper control room indication. (2) Valve operation under maximum expected differential pressure conditions (consistent with system test limitations). (3) Operability at maximum expected pressure and temperature (consistent with system test limitations). c. Pumps and Motors (1) Proper operation of injection pumps and motors in all design operating modes. (2) Verify design acceptance criteria are met for NPSH performance under maximum system flow and temperature conditions. The test should also verify, by inspection, that no foreign material has entered into the pump to ensure that performance degradation does not occur and verify that the pump suction strainer is not clogged with debris so that pump failures or other system degradation does not occur. (3) Verify design acceptance criteria are met for individual pump capacity and discharge head. (4) Verify design acceptance criteria are met for pump response time (time to reach rated flow conditions) under minimum design voltage and frequency. DG-1253, Page 9 (5) Verify design acceptance criteria are met for pump motor start sequence, overspeed protection, and adequate margins between motor running currents and protective breaker ratings. National Fire Protection Association (NFPA) Standard 805, “Performance-Based Standard for Fire Protection for Light Water Reactor Electric Generating Plants,” 2001 Edition (Ref. 5), provides additional guidance for the coordination of protective breakers. (6) Verify design acceptance criteria are met for vibration levels. Direct contact accelerometers or noncontacting vibration measurement methods are acceptable. d. Controls (1) Verify design acceptance criteria are met for operation of controls, including controls that transfer pump suction. The tests should also verify separately and independently each channel or bus to identify any failures or losses of redundancy. Testing should include all backup and redundant controls. (2) Verify design acceptance criteria are met for