Document: NRC Regulatory Guide
Document ID: 8e45dce1-e1e7-4415-b1dd-7e2a610e545b
Document Type: regulatory_guide
Title: Fire Protection for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2023/ML20231A835.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.189
CFR Part: 
CFR Title: 

Content:
endurance test period. If this method is used to satisfy the hose stream test criteria, any one of the following hose stream applications is acceptable: a. The stream applied at random to all exposed surfaces of the test specimen through a 64-mm (2.5-in.) national standard playpipe with a 38-mm (1.5-in.) orifice at a pressure of 207 kPa (30 psi) at a distance of 6.1 m (20 ft) from the specimen (durations of the hose stream applications should be 1 minute for a 1-hour barrier and 2.5 minutes for a 3-hour barrier). b. The stream applied at random to all exposed surfaces of the test specimen through a 38-mm (1.5-in.) fog nozzle set at a discharge angle of 30 degrees with a nozzle pressure of 517 kPa (75 psi) and a minimum discharge of 284 liters per minute (L/min) (75 gallons per minute (gal/min)) with the tip of the nozzle at a maximum of 1.5 m (5 ft) from the test specimen (duration of the hose stream application should be 5 minutes for both 1-hour and 3-hour barriers). c. The stream applied at random to all exposed surfaces of the test specimen through a 38-mm (1.5-in.) fog nozzle set at a discharge angle of 15 degrees with a nozzle pressure of 517 kPa (75 psi) and a minimum discharge of 284 L/min (75 gal/min) with the tip of the nozzle at a maximum of 3 m (10 ft) from the test specimen (duration of the hose stream application should be 5 minutes for both 1-hour and 3-hour barriers). B-3. Demonstrating Functionality of Cables Protected by Raceway Fire Barrier Systems during and after Fire Endurance Test Exposure During fire tests of raceway fire barrier systems, thermal damage to the cables has led to cable jacket and insulation degradation without the loss of circuit integrity as monitored using ANI criteria DG-1359, Appendix B, Page B-6 (applied voltage of 8–10 volts (V) direct current (DC)). Since cable voltages used for ANI circuit integrity tests do not replicate cable operating voltages, loss of cable insulation conditions can exist during the fire test