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:
tem remained intact during the fire exposure and water hose stream test without developing any openings through which the cable tray, raceway, or component (e.g., cables) is visible. NFPA 251 and ASTM E-119 allow flexibility in hose stream testing. The standards allow the hose stream test to be performed on a duplicate test specimen subjected to a fire endurance test for a period equal to one-half of that indicated as the fire resistance rating, but not for more than 1 hour (e.g., 30 minute fire exposure to qualify a 1-hour fire rated barrier). For duplicate electrical cable tray or raceway and component fire barrier test specimens that have been exposed to the 1/2-duration test fire exposure, the hose stream application specified by NFPA 251 is acceptable. NFPA 251 requires the stream of water to be delivered through a 6.4 cm (2 1/2-inch) hose discharging through a standard 2.9 cm (1 1/8-inch) playpipe nozzle onto the test specimen after the fire exposure test. The stream is applied with the nozzle orifice positioned 6.1 meters (20 feet) away from the center of the test specimen at a pressure of 207 kPa (30 psi). The application of the stream is to all exposed parts of the specimen for a minimum duration of 1 minute for a 1-hour barrier and 2 1/2 minutes for a 3-hour barrier. As an alternate for electrical raceway fire barrier test specimens, the application of the hose stream test can be performed immediately after the completion of the full fire endurance test period. If this method is used to satisfy the hose stream test criteria, the following hose stream applications are acceptable: The stream applied at random to all exposed surfaces of the test specimen through a 6.4 cm (2 1/2-inch) national standard playpipe with a 2.9 cm (1 1/8-inch) orifice 9.5.1-37 DRAFT Rev. 4 - April 1996 at a pressure of 207 kPa (30 psi) at a distance of 6.1 meters (20 feet) from the specimen. (Duration of the hose stream application - 1 minute for a 1-hour barrier and 2 1/2 minutes