Document: NUREG-0800
Document ID: b351c30f-74b4-4d36-833e-939d23abae4e
Document Type: srp
Title: D-C POWER-SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350494.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
The.means proposed for monitoring the status of system operability are reviewed. Periodic onsite testing capability is reviewed. 7. Other Review Areas The d-c system is reviewed to determine that: (a) The system and its components have the appropriate seismic design classification. 8.3.2-2 Rev. 2 - July 1981 (b) The system and its components are housed in a structure with seismic Category I classification. (c) The system and its components are designed to withstand environmental conditions associated with normal operation, natural phenomena, and postulated accidents. (d) The system and its components have a "Class IE" quality assurance classification. In the review of other areas associated with the d-c onsite power system, the PSB will coordinate other branches' evaluations that interface with the overall review of the system as follows: The Auxiliary System Branch (ASB) evalutes the adequacy of those auxiliary systems that are vital to the proper operation and/or protection of the d-c power system as part of its primary .review responsibility for' SRP Section 9.4. This includes such systems as the heating and ventilation systems for load center, battery, battery charger, and inverter rooms. In particular, the ASB determines that the piping, ducting, and valving arrangements of redundant vital auxiliary supporting systems meet the single failure criterion. In addition, the ASB examines the physical arrangement. of the d-c power system and its supporting auxiliary system components and associ- ated structures to determine that single events and accidents will not disable redundant features as part of its primary review responsibility for SRP Section 3.4.1, 3.5.1.1, 3.5.2, and 3.6.1. The ASB determines those system components requiring electric power as a function of time for each mode of reactor operation and accident conditions as part of its primary review responsibility for SRP Sections 6.7, 9.1.3, 9.1.4, 9.2, 9.3, 9.4, 9.5.1, 10.4.7, and 10.4.9. The Containment