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:
n addition, the reviewer verifies that the vital supporting system redundant instrumentation, control devices, and loads are powered from the same redundant distribution system as the system that they support. The reviewer will also verify that the vital supporting systems that are associated with the emergency diesel engines, such as the provisions for dc control power, are in accordance with the acceptance criteria. The organization responsible for the review of plant ventilation systems evaluates the other aspects of the vital supporting systems to verify that the design, capacities, and physical independence of these systems are adequate for their intended functions. This review includes an assessment of the heating, ventilation, and air conditioning (HVAC) systems identified as necessary to Class 1E systems, such as the HVAC systems for the electrical switchgear, battery, charger, and inverter rooms. The organization responsible for the review of plant ventilation systems will verify the adequacy of the HVAC system design to maintain temperature and relative humidity in the room as required for proper 8.3.2-17 Revision 4 - May 2010 operation of the safety equipment during both normal and accident conditions. This organization will also verify that redundant HVAC systems are located in the same enclosure as the redundant unit they serve or are separated in accordance with the same criteria as those for the systems they support. 6. System Testing and Surveillance. To ensure that the proposed periodic onsite testing capabilities of the safety-related dc power system satisfy the requirements of GDC 18 and the positions of RGs 1.32 and 1.118, the staff will review the descriptive information, functional logic diagrams, and electrical control and schematics to verify that the design has the built-in capability to permit integral periodic testing of safety-related dc systems when the reactor is in operation. The reviewer will also verify the built-in capability for