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:
on 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 are pressurizer pressure, pressurizer level, reactor coolant temperature, steam generator pressure, steam generator level, source-range neutron flux, level indication for tanks involved in shutdown, and shutdown system diagnostic instrumentation. Typical parameters for BWR displays are reactor vessel water level and pressure, suppression pool level and 1Shutdown remote from the control room is not an event analyzed in the accident analysis in Chapter 15 of the SAR. Specific scenarios have not been specified upon which the adequacy of shutdown capability remote from the control room is evaluated. However, smoke due to a fire in the control room has long been recognized as the type of event that could force the evacuation of the control room and result in a need to shut down remote from the control room. Regulatory Guide 1.189, “Fire Protection for Operating Nuclear Power Plants,” establishes the bases for safe shutdown with respect to fire protection. Specifically, fire damage limits as they impact on safe shutdown have been established therein. These limits do not require consideration of an additional, random, single failure in the evaluation of the capability to safely shut down as a consequence of fires. The evaluation of conformance to Regulatory Guide 1.189 is addressed in SRP Section 9.5.1. Therefore, the application of the single-failure criterion to remote shutdown is only applicable only to for other events that could cause the control room to become uninhabitable. These events would not result in consequential damage or unavailability of systems required for safe shutdown. 7.4-7 Draft Revision 6 – August 2015 temperature, emergency or isolation condenser level indication for tanks involved in shutdown, and shutdown system diagnostic instrumentation. The