Secondary- None

The descriptive information, analyses, and referenced documents, including functional logic diagrams, functional piping and instrument diagrams, electrical single-line diagrams, tables, physical arrangement drawings, and electrical schematics, for the a-c onsite power system presented in the applicant's safety analysis report (SAR) are reviewed. The intent of the review is to determine that the a-c onsite power system satisfies the requirements of General Design Criteria 2, 4, 5 17, 18 and 50 and will perform Its intended functions during all plant operating and accident conditions. The a-c onsite power system includes those standby power sources, distribution systems, and vital supporting systems provided to supply power to safety-related equipment. Diesel generator sets have been widely used as the standby power source for the a-c onsite power system and will be covered in this SRP section. Other standby. power sources such as nearby hydroelectric, nuclear, or fossil units including gas turbine-generator sets will not be addressed herein. These sources, when proposed, will be evaluated on an individual case basis. In addition, those interface areas between the onsite and offsite power systems at the station distribution system level are within the scope of review of this SRP section insofar as they relate to the independence of the onsite power system. The PSB will review the following features of the a-c onsite power system during both the construction permit (CP) and operating license (OL) stages of the licensing process: 1. System Redundancy Requirements The onsite power system is reviewed to determine that the required redundancy of safety-related components and systems is provided. This Rev. 2- July 198