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
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CFR Title: 

Content:
hen met, demonstrate and document the ability of equipment to perform safety function(s) under applicable service conditions, including design-basis events, reducing the risk of common-cause equipment failure. The regulatory positions delineated in this guide reflect the state of the art. NRC and industry research programs currently in progress are investigating such concerns as the effects of oxygen in a loss of coolant accident (LOCA) environment, the validity of sequential versus simultaneous applications of steam and radiation environments, and fission product releases following accidents. The staff recognizes that the results of research programs may lead to revisions of the regulatory positions contained herein. Consideration of International Standards The International Atomic Energy Agency (IAEA) works with member states and other partners to promote the safe, secure, and peaceful use of nuclear technologies. The IAEA develops Safety Standards and Safety Guides for protecting people and the environment from harmful effects of ionizing radiation. This system of safety fundamentals, safety requirements, safety guides, and other relevant reports reflects an international perspective on what constitutes a high level of safety. To inform its development of this RG, the NRC considered IAEA Safety Requirements and Safety Guides2 pursuant to the Commission’s International Policy Statement (Ref. 27) and Management Directive and Handbook 6.6 (Ref. 28). In development of this RG, the NRC considered IAEA Safety Report Series No. 3, “Equipment Qualification in Operational Nuclear Power Plants: Upgrading, Preserving, and Reviewing,” issued April 1998 (Ref. 29). Furthermore, IEC/IEEE Std. 60780-323, Edition 1, 2016-02, was created based on a collaborative international effort to harmonize standard qualification practices developed from IEC 60780:1998, “Nuclear Power Plants – Electrical Equipment of the Safety System – Qualification” (Ref. 30), and IEEE Std.