Document: NUREG-0800
Document ID: 02f672d7-50e8-458f-90d4-e5eb19bd5a4d
Document Type: srp
Title: EMERGENCY DIESEL ENGINE COOLING WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550035.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.5
CFR Part: 
CFR Title: 

Content:
ent and system descriptions of mechanical and performance characteristics are reviewed for whether the seismic and quality group classifications are included and whether the piping and instrumentation diagrams (P&IDs) indicate any points of change at system or system component interfaces. B. Failure of a piping interconnection, as shown on system P&IDs, between subsystems does not cause total EDECWS degradation. Results of failure modes and effects analyses are bases of acceptance. C. Provisions are made for inspection of components as shown on system layout drawings. D. EDECWS performance and water chemistry complies with engine manufacturer recommendations. E. The engine "first try" starting reliability has been increased by an independent loop for circulating heated water while the engine is in the standby mode. F. A three-way bypass-type thermostatically-controlled valve controls water flow through the jacket water coolers or radiators to maintain proper coolant temperature at the engine inlet as specified by the manufacturer. G. Temperature sensors alert the operator when cooling water temperatures exceed the limits recommended by the manufacturer. The interfacing review branch reviews protective interlocks as indicated in subsection I of this SRP section. H. Adequate volume is available to maintain system water level and pump net positive suction head without refill, assuming expected water loss over a seven-day period of engine operation. 9.5.5-9 Revision 3 - March 2007 2. The reviewer verifies whether the EDECWS can be vented to fill all spaces with water. SAR statements to the effect that the system design satisfies this requirement are acceptable. 3. The reviewer verifies whether system function will be maintained in the event of adverse environmental phenomena and loss of offsite power. The reviewer evaluates the system for whether: A. Failure of nonessential EDECWS portions or of other systems not designed to seismic Category I requirements and located