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:
enerally not serviceable (i.e., not able to be accessed to replace or maintain) after the onset of a design basis event. For the purposes of this guide, the primary objective of “qualification” is to demonstrate that equipment important to safety can perform its safety function(s) without experiencing common-cause failures before, during, and after applicable design-basis events. Chapter 11 and Appendix A to the Electric Power Research Institute’s (EPRI’s) “Plant Support Engineering: Nuclear Power Plant Equipment Qualification Reference Manual,” Revision 1, issued September 2010 (Ref. 26), provides a detailed regulatory history of electrical and mechanical equipment qualification. While the agency has not officially endorsed this EPRI document, the NRC staff has reviewed Chapter 11 and Appendix A and found that it reflects an accurate representation of the regulatory history of electrical and mechanical equipment qualification. IEC/IEEE 60780-323, Edition 1, 2016-02, was prepared by Subcommittee 45A, “Instrumentation, control and electrical systems of nuclear facilities,” of IEC Technical Committee 45, “Nuclear instrumentation,” in cooperation with the Nuclear Power Engineering Committee of the Power & Energy Society of the IEEE, under the IEC/IEEE Dual Logo Agreement between the IEC and the IEEE. The international standard describes principles, methods, and procedures for qualifying equipment, DG-1361, Page 8 maintaining and extending qualification, and updating qualification for Class 1E equipment and interfaces that are to be used in nuclear power plants, including components or equipment of any interface whose failure could adversely affect any Class 1E equipment. The qualification specifications in IEC/IEEE 60780-323, Edition 1, 2016-02, when 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