Document: NUREG-0800
Document ID: f673d9c7-5410-4f11-8c45-1935b546a77f
Document Type: srp
Title: EMERGENCY DIESEL ENGINE COOLING WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070570.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.5
CFR Part: 
CFR Title: 

Content:
verify that the above seismic and quality classification have been included and that the P&IDs indicate any points of change at the systems and/or systems components interfaces. 9.5.5-9 DRAFT Rev. 3 - April 1996 b. Failure of a piping interconnection, as shown on system piping and instrumentation diagrams (P&IDs), between subsystems does not cause total degradation of the EDECWS. The results of failure modes and effects analyses are used as a basis of acceptance. c. Provisions have been made to permit inspection of components, as shown on system layout drawings. d. The performance and water chemistry of the EDECWS is in conformance with the engine manufacturer's recommendations. e. The engine "first try" starting reliability has been increased by providing an independent loop for circulating heated water while the engine is in the standby mode. f. A three-way bypass-type thermostatically controlled valve has been provided to control water flow through the jacket water coolers or radiators so that proper coolant temperature is maintained at the engine inlet, as specified by the manufacturer. g. Temperature sensors have been provided to alert the operator when cooling water temperatures exceed the limits recommended by the manufacturer. The EELB reviews protective interlocks as indicated in subsection I of this SRP section. 47 Protective interlocks in this system are acceptable if the SAR indicates that the interlocks are in conformance with Branch Technical Position ICSB-17 (PSB).Position C.1.8 of Regulatory Guide 1.9.48 h. Adequate volume is available to maintain system water level and pump NPSH without refill assuming expected water loss over a 7-day period of engine operation.49 2. The reviewer verifies that the EDECWS can be vented to assure that all spaces are filled with water. Statements in the SAR to the effect that the system design satisfies the above requirement are acceptable. 3. The reviewer verifies that system function will be maintained in the event