Document: NRC Regulatory Guide
Document ID: 50995365-d97f-4101-970a-378af6b5374b
Document Type: regulatory_guide
Title: Qualification of Fiber-Optic Cables, Connections, and Optical Fiber Splices for Use in Safety Systems for Production and Utilization Facilities (Rev. 0)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2505/ML25052A253.pdf
Revision Date: 2025-08
Chapter: 
Section ID: RG-1.257
CFR Part: 
CFR Title: 

Content:
s an approach that is acceptable to the staff of the U.S. Nuclear Regulatory Commission (NRC) for use in complying with NRC regulations that address the environmental qualification (EQ) of fiber-optic cables, connections, and optical fiber splices in safety systems in production and utilization facilities. This RG endorses, subject to the conditions described in Section C of this RG, the Institute of Electrical and Electronics Engineers (IEEE) Standard (Std.) 1682-2023, “IEEE Standard for Qualifying Fiber Optic Cables, Connections, and Optical Fiber Splices for Use in Safety Systems in Nuclear Power Generating Stations” (Ref. 1). Applicability This RG applies to applicants and licensees subject to Title 10 of the Code of Federal Regulations (10 CFR) Part 50, “Domestic Licensing of Production and Utilization Facilities” (Ref. 2), or 10 CFR Part 52, “Licenses, Certifications, and Approvals for Nuclear Power Plants” (Ref. 3). Under 10 CFR Part 50, this RG applies to applicants for and holders of licenses, as defined in 10 CFR 50.2, “Definitions.” Under 10 CFR Part 52, this RG applies to applicants for and holders of combined licenses, standard design certifications, and standard design approvals. Applicable Regulations • 10 CFR Part 50 requires, among other things, that structures, systems, and components (SSCs) that are important to safety in a nuclear power plant must be designed to accommodate the effects of environmental conditions (i.e., remain functional under postulated design basis events (DBEs)). o 10 CFR 50.49, “Environmental qualification of electric equipment important to safety for nuclear power plants,” requires that holders or applicants for an operating license for a nuclear power plant issued under 10 CFR Part 50 shall establish a program for the RG 1.257, Rev. 0, Page 2 environmental qualification (EQ) of electric equipment as defined in 10 CFR 50.49. Under 10 CFR 50.49, holders of a combined license or a manufacturing license