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:
t 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 Regulatory Guides 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 the testing recommended in Regulatory Guide 1.129 (see also IEEE Std. 450). IEEE Std. 603, as endorsed by Regulatory Guide 1.153, also describes a method acceptable to the staff for reviewing the surveillance and testability of the safety-related aspects of the onsite dc power system. Compliance with IEEE Std. 603-1991 is only required for plants with construction permits issued after May 13, 1999. Operating nuclear power plants are encouraged, but not required, to comply with IEEE Std. 603 for future system-level modifications. The staff will review the descriptive information and design implementation, as depicted on electrical drawings, of the means proposed for automatically indicating at the system level a bypassed or deliberately inoperative status of a redundant portion of a safety-related system to ascertain that the design is consistent with Regulatory Guide 1.47 and Branch Technical Position 8-5. This position establishes the basis to consider in arriving at an acceptable design for the inoperable status indication system. 7. Station Blackout Events. To ensure that plant systems have the capability and capacity to withstand an SBO event of a specified minimum duration, the