Document: NUREG-0800
Document ID: 59c7531b-4cb1-436b-af66-a05bf36ba24f
Document Type: srp
Title: SAFE SHUTDOWN SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159B122.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.4
CFR Part: 
CFR Title: 

Content:
ipment comprising the safe shutdown systems, the reviewer should consider the safe shutdown functions at the system level. The safe shutdown systems design should be compatible with the SAR Chapter 15 design bases accident analyses. It is not sufficient to evaluate the adequacy of the safe shutdown systems only on the basis that the design meets the specific requirements of IEEE Std 279-1971 or IEEE Std 603-1991. Major portions of the systems required for safe shutdown are also used as ESF systems, as discussed in SRP Section 7.3. Therefore, the review under this SRP section includes those aspects of ESF systems that are unique to safe shutdown in addition to those systems required for safe shutdown, that are not classified as ESF systems. The safe shutdown systems review should address the topics identified as applicable by SRP Table 7-1. SRP Appendix 7.1-A describes review methods for each topic. Major design considerations that should be emphasized in the review of I&C for the safe shutdown systems are identified below. A. Independence - See SRP Appendix 7.1-B, Subsections 4.6 and 4.7 and SRP Appendix 7.1-C, Subsections 5.6 and 6.3. B. Use of digital systems, - See SRP Appendix 7.0-A and SRP Appendix 7.1-D. C. Periodic testing - See SRP Appendix 7.1-B, Subsection 4.10 and SRP Appendix 7.1-C, Subsections 5.7 and 6.5. D. Remote shutdown capability1 - Plant designs should provide for control in locations removed from the main control room that may be used for manual control and alignment of safe shutdown system equipment needed to achieve and maintain hot and cold shutdown. This control equipment should be capable of operating independently of (i.e., without interaction with) the equipment in the main control room. This equipment may include the remote shutdown station and other local controls. The design of remote shutdown stations should provide appropriate displays so that the operator can monitor the status of the shutdown. Typical parameters for PWR displays