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:
ies. 5. General Plant Guidelines a. Building Design (1) Fire barriers with a minimum fire resistance rating of 3 hours should be provided to: I I (a) Separate safety-related systems from any potential fires related areas that could affect their ability to perform function; (b) Separate redundant divisions or trains of safety-related each other so that both are not subject to damage from a (c) Separate individual units on a multiple-unit site unless ments of General Design Criterion 5 are met with respect in nonsafety- their safety systems from single fire; the require- to fires. (2) Appropriate fire barriers should be provided within a single safety division to separate components that present a fire hazard to other safety-related 9.5.1-28 Rev. 2 - July 1981 components or high concentrations of safety-related cables within that division. (3) Openings through fire barriers for pipe, conduit, and cable trays which separate fire areas should be sealed or closed to provide a fire resistance rating at least equal to that required of the barrier itself. Openings inside conduit larger than 4 inches in diameter should be sealed at the fire barrier penetration. Openings inside conduit 4 inches or less in diameter should be sealed at the fire barrier unless the conduit extends at least 5 feet on each side of the fire barrier and is sealed either at both ends or at the fire barrier with noncombustible material to prevent the passage of smoke and hot gases. Fire barrier penetrations that must maintain environmental isolation or pressure differentials should be qualified by test to maintain the barrier integrity under such conditions. Penetration designs should utilize only noncombustible materials and should be qualified by tests. The penetration qualification tests should use the time-temperature exposure curve specified by ASTM E-119, "Fire Test of Building Construction and Materials." The acceptance criteria for the test should require that: (a) The fire barrier penetration