Secondary- None

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 5, 17, and 18, and will perform its design functions during all plant operating and accident conditions. 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. The PSB will review the following features of the preferred power systems during both 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 examined to see that both electrical and physical separation exists so as to minimize the chance of simultaneous failure. This includes a review of the assign-ment of power sources from the grid, location of rights-of-way, transmission lines and towers, transformers, switchyard interconnections (breakers an