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:
he extent that could adversely affect safe shutdown capabilities including operator actions. The control room is excluded because an alternative shutdown capability is provided which is physically and electrically independent of the control room. In the reactor containment, redundant shutdown systems must be provided with fire protection to ensure, to the extent practical, that one shutdown division be free of fire damage. Because of unique design layout, other areas may be accepted on an individual basis.154 (2) To meet the guidelines of Position C.5.b.1 , one of the following means of ensuring that 155 one of the redundant trains is free of fire damage should be provided: (a) Separation of cables and equipment and associated circuits of redundant trains by a fire barrier having a 3-hour rating. Structural steel forming a part of or As defined in the Standard Technical Specifications. * DRAFT Rev. 4 - April 1996 9.5.1-40 supporting such fire barriers should be protected to provide fire resistance equivalent to that required of the barrier (See Position 3 of Reference 46). ; 156 (b) Separation of cables and equipment and associated circuits of redundant trains by a horizontal distance of more than 6.1 m (20 feet) with no intervening 157 combustible or fire hazards. In addition, fire detectors and an automatic fire suppression system should be installed in the fire area; or (c) Enclosure of cable and equipment and associated circuits of one redundant train in a fire barrier having a 1-hour rating. In addition, fire detectors and an automatic fire suppression system should be installed in the fire area. For those areas relying on the criteria of (b) or (c) above, if full area detection and suppression is not installed, an evaluation must be performed to assess the adequacy of partial suppression and detection to protect against the hazards in the area. The evaluation must be performed by a fire protection engineer and, if required, a systems engineer (Reference