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:
n that could occur given single random failure of circuit overload protective devices located in circuits of the onsite Class 1E and non-Class 1E dc power systems.70 8. 10 CFR 50.63, as related to the ability of the onsite dc power system to support the plant in withstanding or coping with, and recovering from a station blackout event, and the guidelines of Regulatory Guide 1.155, as related to the capability and the capacity of the onsite dc power system for an event of specified duration.71 Branch technical positions and regulatory guides that provide information, recommendations, and guidance and in general describe a basis acceptable to the staff that may be used to implement the requirements of General Design Criteria 2, 4, 5, 17, 18, and 50 are identified in SRP Section 8.1, Table 8.1, and Appendix 8-A. Technical Rationale72 The technical rationale for application of these acceptance criteria to reviewing spent fuel storage is discussed in the following paragraphs:73 1. Compliance with GDC 2 requires that nuclear power plant structures, systems, and components important to safety be designed to withstand the effects of natural phenomena such as earthquake, tornado, hurricane, flood, tsunami, or seiche without loss of capability to perform their intended safety functions. 8.3.2-9 DRAFT Rev. 3 - April 1996 With regard to the dc power system, this criterion requires that capability for the onsite dc power system to perform its functions be retained during the most severe natural phenomena that have been historically reported for the site and surrounding area. Therefore, the dc power system and its components must normally be located in seismic Category I structures that provide protection from the effects of tornadoes, tornado missiles, and floods. Equipment and components comprising the onsite dc power system must also generally be seismically designed and/or qualified to perform their functions in the event of an earthquake. Meeting this requirement will