Document: NUREG-0800
Document ID: 0d050def-90d0-4fd6-b15c-2396827c0fb4
Document Type: srp
Title: OFFSITE POWER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070497.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.2
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Power Systems Electrical Engineering Branch (PSBEELB)1 Secondary - None I. AREAS OF REVIEW The descriptive information, analyses, and referenced documents, including electrical single-line diagrams, electrical schematics, logic diagrams, tables, and physical arrangement drawings for the offsite power systems, presented in the applicant's safety analysis report (SAR), are reviewed. The objective of the review is to determine that this system satisfies the requirements of GDC General Design Criteria 5, 17, and 18, and will perform its design functions during all 2 plant operating and accident conditions. If/when provided, the alternate ac (AAC) power source for safe shutdown [non-design basis accident (non-DBA)] in the event of a station blackout is also reviewed with respect to its adequacy and independence from the offsite and onsite power systems. The AAC source may be located at or nearby the plant.3 The offsite power system is referred to in industry standards and regulatory guides as the "preferred power system." It includes two or more physically independent circuits capable of operating independently of the onsite standby power sources and encompasses the grid, transmission lines (overhead or underground), transmission line towers, transformers, switchyard components and control systems, switchyard battery systems, the main generator, and disconnect switches provided to supply electric power to safety-related and other equipment. DRAFT Rev. 4 - April 1996 8.2-2 The PSBEELB will review the following features of the preferred power systems during both 4 the construction permit (CP) and operating license (OL) stages of the licensing process: 1. The preferred power system arrangement is reviewed to determine that the required minimum of two separate circuits from the transmission network to the onsite distribution system is provided. In determining the adequacy of this system, the independence of the two (or more) circuits is