Document: NUREG-0800
Document ID: f0fdf572-145b-48ca-b0eb-03ce5f350473
Document Type: srp
Title: Nearby Facilities
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0327/ML032740044.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.6
CFR Part: 
CFR Title: 

Content:
ystems and components by common power supply, common enclosure, or the potential to cause spurious operations that could prevent or adversely affect the capability to safely shut down the reactor as a result of fire- induced failures (i.e. hot shorts, open circuits, and short to ground). Automatic — Self-acting, operating by its own mechanism when actuated by some monitored parameter such as a change in current, pressure, temperature, or mechanical configuration. Backup Shutdown — See Alternative Shutdown. Combustible Material — Any material that will burn or sustain the combustion process when ignited or otherwise exposed to fire conditions. Common Enclosure — An enclosure (e.g., cable tray, conduit, junction box) that contains circuits required for the operation of safe shutdown components and circuits for non-safe shutdown components. Common Power Supply — A power supply that feeds safe shutdown circuits and non-safe shutdown circuits. Control Room Complex — The compartments served by the control room emergency ventilation system. Revision 4 - October 2003 38 Dedicated Shutdown — The ability to shut down the reactor and maintain shutdown conditions using structures, systems, or components dedicated to the purpose of accomplishing post-fire safe shutdown functions. Emergency Control Station — A location outside the main control room where actions are taken by operations personnel to manipulate plant systems and controls to achieve safe shutdown of the reactor. Exposure Fire — A fire in a given area that involves either in situ or transient combustibles and is external to any structures, systems, and components located in or adjacent to that same area. The effects of such fire (e.g., smoke, heat, or ignition) can adversely affect those structures, systems, and components important to safety. Thus, a fire involving one success path of safe shutdown equipment may constitute an exposure fire for the redundant success path located in the same area,