Document: NUREG-0800
Document ID: 2b0752f4-9104-408c-b400-d0ec931a3dbf
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350030.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
undant trains by a fire barrier having a 3-hour rating. Structural steel 9.5.1-31 Rev. 2 - July 1981 * forming a part of or supporting such fire barriers should be protected to provide fire resistance equivalent to that required of the barrier; (b) Separation of cables and equipment and associated circuits of redundant trains by a horizontal distance of more than 20 feet with no interven- ing combustible or' fire hazards. In addition, fire detectors and an automatic fire suppression system should be installed in the fire area; or (c) Enc'losure 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. (3) If the guidelines of Positions C5.b.1 and C5.b.2 cannot be met, then alter- native or dedicated shutdown capability and its associated circuits, independent of cables, systems or components in the area, room, or zone under consideration should be provided. c. Alternative or Dedicated Shutdown Capability (1) Alternative or dedicated shutdown capability provided for a specific fire area should be able to achieve and maintain subcritical reactivity condi- tions in the reactor maintain reactor coolant inventory achieve and maintain hot standby; conditions for a PWR (hot shutdown; for a BWR) and achieve cold shutdown* conditions within 72 hours and maintain cold shutdown conditions thereafter. During the postfire shutdown, the reactor coolant system process variables shall be maintained within those predicted for a loss of normal ac power, and the fission product boundary integrity shall not be affected; i.e., there shall be no fuel clad damage, rupture, or any primary coolant boundary, or rupture of the containment boundary. (2) The performance goals for the shutdown functions should be: (a) The reactivity control function should be capable of achieving and maintain- ing cold shutdown reactivity conditions. (b)