Document: NRC Regulatory Guide
Document ID: cf98f778-626a-46c2-a526-aa8661195ab2
Document Type: regulatory_guide
Title: Qualification of Safety-Related Battery Chargers and Inverters for Nuclear Power Plants (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2216/ML22160A570.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.210
CFR Part: 
CFR Title: 

Content:
ment that would at no time be significantly more severe than the environment that would occur during normal plant operation, including anticipated operational occurrences,” which include loss of all offsite power.1 Specifically, 10 CFR 50 Appendix A, GDC 2, and Appendix S require that safety-related equipment including equipment in a mild environment be capable of withstanding the effects of natural phenomena such as earthquakes (seismic events). Additionally, in accordance with 10 CFR 50.55a(h)(3) and 10 CFR 50 Appendix A, GDC 4, 1 The reference to 10 CFR 50.49(c)(3) is being provided for definitional purposes. The environmental qualification of electrical equipment important to safety located in a mild environment is not within the scope of 10 CFR 50.49. DG-1412 Page 6 safety-related equipment, including equipment in a mild environment, is required to be qualified to perform its functions when subjected to environmental and natural phenomena associated with normal and abnormal conditions. Based on the above-mentioned requirements, safety-related battery chargers, inverters, and UPS systems in production and utilization facilities must be qualified to perform their functions in normal and abnormal environmental conditions, and design-basis seismic events, as these are typically located in a mild environment. IEEE Std. 650-2017 updated the qualification for the safety-related battery chargers, inverters, and UPS systems in accordance with the joint standard IEC/IEEE Std. 60780-323. Equipment qualification, as defined in IEEE Std. 650-2017, is the “generation and maintenance of evidence to ensure that equipment will operate on demand to meet system performance requirements during normal and abnormal service conditions and postulated design basis events.” IEEE Std. 650-2017 described an equipment qualification process that involves a combination of analysis and type testing methods and recommended that the analysis methods include a justification of the methods,