Document: NUREG-0800
Document ID: 9fa7092c-7628-402d-9028-6601d5f5fdfb
Document Type: srp
Title: DC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550063.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
ms and features is the same as that discussed herein for the onsite systems. In essence, the reviewer first becomes familiar with the purpose and operation of each vital supporting system and feature, including its component arrangement as depicted on functional P&IDs. Subsequently, the reviewer evaluates the design criteria, analyses, and description and the implementation of the instrumentation, control, and electrical equipment, as depicted on electrical drawings, to verify that the design is consistent with satisfying the acceptance criteria for Class 1E systems. In 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. 8.3.2-17 Revision 3 - March 2007 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 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