Document: NRC Regulatory Guide
Document ID: 848f45be-3c4b-4f6d-a9da-73ea5383e905
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:
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, theories, and assumptions used. IEEE Std. 650-2017 further incorporated a software analysis and a transient test into the qualification methods. Safety-related static battery chargers, inverters, and UPS systems may contain programmable digital devices. Section 5.1.2.1, “Software Analysis,” of IEEE Std. 650-2017 provides guidance for the qualification of these programmable digital devices to demonstrate that they can perform their safety functions. In addition, safety-related static battery chargers, inverters, and UPS systems in production and utilization facilities are designed to remain operable during anticipated transient events, such as a large electrical load rejection, a main turbine generator trip, a loss of offsite power with subsequent emergency diesel generator start and load, and a loss of ac power to UPS systems. Also, operating experience has indicated that asymmetric electrical transients are also possible. IEEE Std. 650-2017, Section 5.1.3.5, “Transient Test,” provides transient testing that will ensure the equipment is capable of functioning during transient events, if required. IEEE Std. 650-2017 incorporated regulatory positions in RG 1.210, Revision 0, regarding the criterion for ignoring mechanical cycling of connectors as an aging factor during the acceleration aging process and the functional performance monitoring during the environmental stress test, in Section 5.2.2.4, “Wire, cable, terminal blocks, and connections,” and Section 5.3.1.7, “Environmental Stress Test,” respectively. Furthermore, the regulatory position in RG 1.210, Revision 0, related to the qualification methods for seismic testing was clarified in Section 5.3.1.8, “Seismic Test,” of IEEE Std. 650-2017. Consideration of International Standards The