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:
ity tests is to justify observed deviations in fire barrier performance. For fire barrier specimens that are tested without cables, an engineering analysis justifying internal fire barrier temperature conditions greater than allowed can be based on a comparison of the fire barrier internal temperature profile measured during the fire endurance test to existing cable-specific performance data, such as environmental qualification (EQ) tests. DG-1359, Appendix B, Page B-2 c. The cable tray, raceway, or component fire barrier system remains 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. The test specimen should represent the construction for which the fire rating is desired in terms of materials, workmanship, and details, such as dimensions of parts, and should be built under representative conditions. Raceway fire barrier systems being subjected to qualification fire endurance tests should represent their end use. For example, if the licensee intends to install a cable tray fire barrier system in the plant without protecting the cable tray supports, the test program should duplicate these field conditions. In addition, the fire test program should encompass or bound raceway sizes and the various configurations for those fire barrier systems installed in the plant. Several test specimens will be required to qualify various sizes of horizontal and vertical runs of cable trays and conduits, junction boxes and pull boxes, and similar configurations. The cable tray or raceway design used for the tests should be constructed with materials and configurations representative of in-plant conditions (e.g., the mass associated with typical steel conduits and cable trays, representative internal and external penetration seals). If the raceway fire barrier test specimen includes cables, these cables should represent the installed plant-specific cables. Measuring