Document: NUREG-0800
Document ID: eb1d19c1-686c-42f5-ba0a-c417c7b12b8e
Document Type: srp
Title: DC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070499.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
tablishes the basis to be considered in arriving at an acceptable design for the inoperable status indication system.103 7. Station Blackout Events To ensure that plant systems have the capability and capacity to withstand a station blackout event of a specified minimum duration, the review of the onsite dc power systems should determine 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 station blackout, that the guidelines of Regulatory Guide 1.155 Positions C.3.2.2 and/or C.3.3.1 have been implemented.104 For standard design certification reviews under 10 CFR Part 52, the procedures above should be followed, as modified by the procedures in SRP Section 14.3 (proposed), to verify that the design set forth in the standard safety analysis report, including inspections, tests, analysis, and acceptance criteria (ITAAC), site interface requirements and combined license action items, meet the acceptance criteria given in subsection II. SRP Section 14.3 (proposed) contains procedures for the review of certified design material (CDM) for the standard design, including the site parameters, interface criteria, and ITAAC.105 IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and that the review supports conclusions of the following type, to be included in the staff's safety evaluation report (SER).106 The dc power system includes power supplies, distribution systems, and load groups arranged to provide dc electric power to safety-related dc loads and for control and switching of the safety-related power systems. The dc power system also provides dc electric power to inverters. The inverters convert the dc to ac and are arranged to provide a dependable power supply for 107 safety-related instrumentation and control loads. The review of the dc power system for the ________ plant covered the