Document: NUREG-0800
Document ID: 16c1145e-ffe2-48c4-bd44-0ccaeb83dc99
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070563.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
ccording to the safety function of the structure, system, or component: Safety Function Fire Damage Limits Hot shutdown One train of equipment necessary to achieve hot shutdown from either the control room or emergency control station(s) must be maintained free of fire damage by a single fire, including an exposure fire. Cold shutdown Both trains of equipment necessary to achieve cold shutdown may be damaged by a single fire, including an exposure fire, but damage must be limited so that at least one train can be repaired or made operable within 72 hours using onsite capability. For new applications, the equipment in any one fire area is assumed to be rendered inoperable by the fire and re-entry into the fire area for repairs and operator actions is not possible. The control room is excluded from this approach provided an independent alternative shutdown capability physically and electrically independent of the control room is provided.101 Design basis Both trains of equipment necessary for mitigation of accidents consequences following design basis accidents may be damaged by a single exposure fire. The most stringent fire damage limit should apply for those systems that fall into more than one category. Redundant systems used to mitigate the consequences of other design basis accidents but not necessary for safe shutdown may be lost to a single exposure fire. However, protection DRAFT Rev. 4 - April 1996 9.5.1-24 shall be provided so that a fire within only one such system will not damage the redundant system. The fire hazards analysis should separately identify hazards and provide appropriate protection in locations where safety-related losses can occur as a result of: (1) Concentrations of combustible contents, including transient fire loads due to combustibles expected to be used in normal operations such as refueling, maintenance, and modifications; (2) Continuity of combustible contents, furnishings, building materials, or combinations thereof in