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:
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 10 cm (4 inches) in diameter 116 should be sealed at the fire barrier penetration. Openings inside conduit 10 cm (4 inches) or less in diameter should be sealed at the fire barrier unless the conduit 117 extends at least 1.5 m (5 feet) on each side of the fire barrier and is sealed either at 118 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. Structural fire barriers (e.g.,walls, floors, ceilings), including Ppenetration designs, should utilize only noncombustible materials and should be qualified by tests in accordance with the applicable sections of NFPA 251 and ASTM E119 (Reference 56). The penetration qualification tests should use the time-temperature exposure curve 119 specified by ASTM E-119., "Fire Test of Building Construction and Materials." The 120 acceptance criteria for the test should require that: (a) The fire barrier penetration design has withstood the fire endurance test without passage of flame or the ignition of cables cotton waste on the unexposed side 121 for a period of time equivalent to the fire resistance rating required of the barrier. (b) The temperature levels recorded for the unexposed side of the fire barrier are 122 analyzed and demonstrate that the maximum temperature does not exceed 163 C (325 F) or 139 C (250 F) above ambient . 123 124 (c) The fFire barrier penetrations remains intact and does not allow projection of 125 water beyond the unexposed surface during the hose stream test. The stream shall be delivered through a 3.8 cm (1-1/2-inch) nozzle set at a discharge angle of 126 30% with a nozzle pressure of 517 kPa