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:
nd 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. The basis for acceptance of the EDECWS in our review was conformance of the designs, design criteria, and bases to the Commission's regulations 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 acceptable and meets the requirements of GDC 2, 4, 5, 17, 44, 45, and 46. This conclusion is based on the following: 1. The applicant has met the requirements of GDC 2, "Design Bases for Protection Against Natural Phenomena," with respect to the ability of structures housing the EDECWS and the system itself to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, and floods, and GDC 4, "Environmental and MissileDynamic Effects Design Bases," with respect to 54 structures housing the system and the system itself being capable of withstanding the effects of externally and internally generated missiles, pipe whip, and jet impingement forces associated with pipe breaks. The EDECWS is housed in a Seismic Category I structure which provides protection from the effects of tornado, tornado missiles, turbine missiles, and floods. This meets the positions of Regulatory Guide 1.115, "Protection Against Low-Trajectory Turbine Missiles," Position C.1, and 1.117 "Tornado Design Classification," Appendix Position 13. 2. The applicant has met the requirements of GDC 5, "Sharing of Structures, Systems, and Components," with respect to capability of shared systems and components important to safety to perform required safety functions. Each unit DRAFT Rev. 3 - April 1996 9.5.5-12 of the plant has its own emergency diesel generators whose EDECWS is not shared between the diesel generators. 3.