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:
engineered safety features actuation • reactor protection • containment isolation • steam line isolation • main feedwater shutdown and isolation • emergency power • emergency core cooling • containment heat removal • containment fission product removal • containment combustible gas control • auxiliary feedwater • containment ventilation • containment radiation monitoring • control room habitability system (e.g., heating, ventilation, and air conditioning; radiation filters) • ventilation for areas containing safety equipment • component cooling • service water • emergency systems to achieve safe shutdown 9 In Title 10 of the Code of Federal Regulations (10 CFR) section 50.49(b)(1), the NRC identifies safety-related electric equipment as a subset of electric equipment important to safety and defines it as the equipment that is relied upon to remain functional during and following design-basis events to ensure (1) the integrity of the reactor coolant pressure boundary, (2) the capability to shut down the reactor and maintain it in a safe-shutdown condition, or (3) the capability to prevent or mitigate the consequences of accidents that could result in potential offsite exposures comparable to the guidelines in 10 CFR Part 100, “Reactor Site Criteria.” DG-1361, Appendix B, Page B-1 APPENDIX B TYPICAL EXAMPLES OF NONSAFETY-RELATED EQUIPMENT The equipment identified in Examples 1, 2, and 3 of this Appendix has typically been classified as safety related. However, the U.S. Nuclear Regulatory Commission licensed some operating plants using less definitive safety classification criteria, and these plants may contain nonsafety-related equipment, such as that in Examples 1, 2, and 3. The provisions of Title 10 of the Code of Federal Regulations (10 CFR) section 50.49, “Environmental qualification of electric equipment important to safety for nuclear power plants,” require that the licensee provide appropriate EQ for equipment