Document: NUREG-0800
Document ID: 6cf2fb95-08c8-493a-b5b1-4d05d609e5c4
Document Type: srp
Title: STATION SERVICE WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070512.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.1
CFR Part: 
CFR Title: 

Content:
quipment. 6. General Design Criterion 46, as related to design provisions to permit operational functional testing of safety-related systems and components. Technical Rationale The technical rationale for application of the above acceptance criteria to the station service water system is discussed in the following paragraphs.36 1. Compliance with GDC 2 requires that the SWS structures, systems and components, which provide essential cooling for safety-related equipment, be designed to withstand the effects of natural phenomena without loss of capability to perform their safety functions. Based on reviewing a number of safety analysis reports, a seismic design classification system was developed for identifying those plant features that should be designed to withstand the effects of the safe shutdown earthquake (SSE). Regulatory Guide 1.29 describes an acceptable method for identifying and classifying those features of light-water reactor nuclear power plants that should be designed to withstand the effects of the SSE. Those structures, systems and components that should be designed to remain functional if the SSE occurs have been designated as Seismic Category 1. Position C.1 of the Regulatory Guide states that systems required for safe shutdown, including their foundations and supports, are designated as Seismic Category I and should be designed to withstand the effects of the SSE and remain functional. Position C.2 of the Regulatory Guide states that structures, systems, or components whose continued function is not required but whose failure could reduce the functioning of any seismic Category I plant feature to an unacceptable safety level, or could result in incapacitating injury to occupants of the control room, should be designed and DRAFT Rev. 5 - April 1996 9.2.1-6 constructed so that the SSE would not cause such failure. Compliance with Regulatory Guide 1.29, Positions C.1 and C.2, assures that the SWS will remain functional during a SSE and provide