Document: NUREG-0800
Document ID: d6f7c640-9c89-4c04-a929-3caac89cdb95
Document Type: srp
Title: EMERGENCY DIESEL ENGINE COOLING WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350039.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.5
CFR Part: 
CFR Title: 

Content:
odes and effects analyses presented in the SAR to ensure the func- tioning of required portions of the system. 6. The performance requirements of the diesel engine are reviewed to deter- mine the time available to provide cooling water to the diesels and the other systems that have to operate to assure onsite power capability. 7. The reviewer verifies that the EDECWS and the diesel generator can per- form for extended periods when less than full electrical power generation is required without degradation of performance or reliability. A statement to the effect that operating procedures will be provided requiring loading of the engine up to a minimum of 25% of full load for I hour after 8 hours of continuous no-load operation or as recommended by the manufacturer will be acceptable. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and his review supports conclusions of the following type, to be included in the staff's safety evaluation report: The emergency diesel engine cooling water system (EDECWS) includes all piping, valves, heat exchangers, and pumps up to the points where the cooling water piping connects to the engine interfaces. The scope of review of the diesel engine cooling water system for the plant included layout drawings, process flow diagrams, piping and instrumentation diagrams, and descriptive information for the system and auxiliary supporting systems that are essential to its operation. The essential portions of the EDECWS that are necessary to mitigate the consequences of an accident are designed to seismic Category I and Quality Group C. 9.5.5-6 Rev. 2 - July 1981 The basis for acceptance of the EDECWS in our review was conformance of the designs, design criteria, and bases to the Commission's regula- tions as set forth in the General Design Criteria (GDC) of Appendix A to 10 CFR Part 50. The staff concludes that the plant design is accept- able and meets the requirements of GDC 2, 4, 5, 17, 44, 45, and