Document: NUREG-0800
Document ID: f9d2d9cb-1d13-407e-ad7a-523fff64de06
Document Type: srp
Title: DC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740391.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
of its primary review responsibility for SRP Sections 8.2 and 8.3.1. 2. In accordance with SRP Section 8.4, the organization responsible for onsite dc power systems reviews overall compliance with 10 CFR 50.63 requirements, including the adequacy of the SBO analysis; the length of time that the plant can either withstand or cope with, and recover from, an SBO event; and the adequacy of dc system power supplies that are not a part of the onsite dc power system reviewed under this SRP section regarding the specified SBO event/duration. 3. The organization responsible for onsite dc power systems reviews the adequacy of the environmental qualification of safety-related electrical equipment, as part of its primary review responsibility for SRP Section 3.11. This includes a review of the capability of safety-related electrical equipment to perform its intended safety functions when subjected to the effects of (a) accident environments such as loss-of-coolant accidents (LOCAs) and/or steamline breaks, (b) abnormal environments that may temporarily exceed equipment continuous-duty design parameters such as temperature and humidity, (c) abnormal environments caused by degradation or loss of heating, ventilation, and/or air conditioning systems, (d) seismic shaking, and (e) normal design environments on redundant safety-related electrical equipment that does not include design diversity (e.g., redundant components manufactured and designed by the same supplier). 4. The organization responsible for the review of plant ventilation systems evaluates the adequacy of those auxiliary supporting ventilation systems that are vital to the proper operation and/or protection of the dc power system, as part of its primary review responsibility for SRP Sections 9.4.1 through 9.4.5. This includes systems such as the heating and ventilation systems for load center, battery, battery charger, and inverter rooms. In particular, the organization responsible for the review of plant ventilation