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:
and Grinding (Hot Work) Work involving ignition sources such as welding and flame cutting should be carried out under closely controlled conditions. Persons performing such work should be trained and equipped to prevent and combat fires. In addition, a person qualified in performing hot-work fire watch duties should directly monitor the work and function as a fire watch. A hot-work permit system to control open flames, welding, cutting, and other hot work should govern the use of ignition sources. A separate permit should be issued for each area where work is to be done. If work continues over more than one shift, the permit should be valid for not more than 24 hours when the plant is operating or for the duration of a particular job during plant shutdown. NFPA 51B, “Standard for Fire Prevention During Welding, Cutting and Other Hot Work” (Ref. 63), includes guidance for protecting against the hazards associated with welding, cutting, and other hot-work operations. DG-1359, Page 43 2.2.2 Temporary Electrical Installations The use of temporary services at power reactor facilities is routine, especially to support maintenance and other activities during outages. In view of the magnitude and complexity of some temporary services, proper engineering and, once installed, maintenance of the design basis become significant. The temporary cables should be considered as transient combustibles and may represent ignition sources. Plant administrative controls should provide for an engineering review of temporary installations. These reviews should ensure that appropriate precautions, limitations, and maintenance practices are established for the term of such installations. The Institute of Electrical and Electronics Engineers (IEEE) Standard 835, “Standard Power Cable Ampacity Tables” (Ref. 64), and ANSI/IEEE C.2, “National Electrical Safety Code”® (Ref. 65), contain guidance on temporary electrical installations, including derating closely spaced cables. 2.2.3