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:
the dc power system is to determine whether this system satisfies the acceptance criteria in Subsection II and will perform its design functions during normal plant operations, anticipated operational occurrences, accident conditions, and SBO events. To ensure that the acceptance criteria in Subsection II are satisfied, the review is performed as detailed below. The primary reviewer will coordinate this review with the other branch areas of review, as stated in Subsection I. The primary reviewer obtains and uses such input as required to ensure that this review procedure is complete. 8.3.2-13 Revision 4 - May 2010 The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant=s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. Although IEEE Std. 946, IEEE Std. 1375, and IEEE Std. 1184 furnish additional technical supporting information related to the design of onsite dc power systems, a RG has not formally endorsed these standards. Therefore, they are included here as additional sources of information only. 1. System Redundancy Requirements. GDCs 33, 34, 35, 38, 41, and 44 set requirements regarding safety-related systems that must be supplied by the onsite ac and dc power systems. In addition, these criteria state that safety-related system redundancy shall be such that, for onsite power system operation (assuming offsite power is not available), the system safety function can be accomplished, assuming a single failure. The acceptability of the onsite dc power system with regard to redundancy is based on conformance to the same degree of redundancy as that needed for safety-related components and systems required by these criteria. As endorsed by RG 1.153,