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:
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 RG 1.129 (see also IEEE Std. 450). IEEE Std. 603, as endorsed by RG 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 RG 1.47 and BTP 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 review of the onsite dc power systems should confirm that the requirements of 10 CFR 50.63 regarding onsite dc system capability and capacity are met. The reviewer verifies, as applicable for portions of the onsite dc power system that are required for SBO, that the guidelines of Regulatory Positions C.3.2.2 and/or C.3.3.1 and C 3.3.5 of RG 1.155 have been implemented. 8. For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the final safety analysis report (FSAR) meets the acceptance criteria. DCs