Document: NRC Regulatory Guide
Document ID: e16da529-b6b4-4fdf-bc3f-7490180363f3
Document Type: regulatory_guide
Title: Environmental Qualification of Certain Electric Equipment Important to Safety for Nuclear Power Plants (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2018/ML20183A423.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.89
CFR Part: 
CFR Title: 

Content:
uirements for environmental qualification (EQ) of certain electric1 equipment important to safety for nuclear power plants. It endorses, with clarifications, the “English” portion of the dual logo International Electrotechnical Commission (IEC)/Institute of Electrical and Electronic Engineers (IEEE) Standard (Std.) 60780-323, “Nuclear Facilities—Electrical Equipment Important to Safety—Qualification,” Edition 1, 2016-02 (Ref. 1). Applicability This RG applies to licensees and applicants subject to Title 10 of the Code of Federal Regulations (10 CFR) Part 50, “Domestic Licensing of Production and Utilization Facilities” (Ref. 2), and 10 CFR Part 52, “Licenses, Certifications, and Approvals for Nuclear Power Plants” (Ref. 3). With respect to 10 CFR Part 50, this RG applies to holders of or an applicant for an operating license. With respect to 10 CFR Part 52, this RG applies to applicants and holders of combined licenses, standard design certifications, standard design approvals, and manufacturing licenses. This RG does not apply to nuclear power plants that have submitted certifications as required by 10 CFR 50.82(a)(1) and by 52.110(a). 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)). 1 For this document, the terms “electric”, “electronics” and “electrical” are considered synonymous. DG-1361, Page 2 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 issued under Part 50 shall establish a program for the EQ of electric equipment as defined in 10 CFR 50.49. o 10 CFR 50.55a(h), “Protection and safety systems,” states that protection systems must