Document: NUREG-0800
Document ID: a2680f96-0e15-402d-89ab-688ff09806a8
Document Type: srp
Title: with respect to the specified station blackout event/duration.13
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070497.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
layout drawings (CP and OL) and schematic diagrams (OL) , and descriptive 83 information. The basis for acceptance of the offsite power system in our review was conformance of the design criteria and bases to the Commission's regulations as set forth in the General Design Criteria (GDC) of Appendix A to 10 CFR Part 50. The staff concludes that the 84 plant design is acceptable and meets the requirements of GDC General Design Criteria85 5, 17, and 18; and [where applicable] also meets the requirements of 10 CFR 50.63 with regard to the alternate ac (AAC) power source provided for station blackout. This 86 conclusion is based on the following: 1. The applicant has met the requirements of GDC 5, "Sharing of Structures, Systems, and Components," with respect to sharing of circuits of the preferred 8.2-15 DRAFT Rev. 4 - April 1996 power system between units. Each circuit has sufficient capacity to operate the engineered safety features for a design basis accident on one unit and those systems required for concurrent safe shutdown on the remaining units. 2. The applicant has met the requirements of GDC 17, "Electric Power Systems," with respect to the offsite power system's (a) capacity and capability to permit functioning of structures, systems, and components important to safety; (b) provisions to minimize the probability of losing electric power from any of the remaining supplies as a result of, or coincident with, the loss of power generated by the nuclear power unit or loss of power from the onsite electric power supplies; (c) physical independence of circuits; and (d) availability of circuits. The preferred power system consists of at least two physically independent 87 circuits routed from the electrical grid system by transmission lines to the onsite power distribution system. At least one circuit will be available within a few seconds following a loss of coolant accident and is considered an immediate access circuit. Each circuit is designed and located so as to