Document: NRC Regulatory Guide
Document ID: 08964ae0-0fa8-4e51-af44-0c6a1ee6e94c
Document Type: regulatory_guide
Title: Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1221/ML12216A011.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.108
CFR Part: 
CFR Title: 

Content:
Revision I August 1977 U.S. NUCLEAR REGULATORY COMMISSION REGULATORY GUIDE OFFICE OF STANDARDS DEVELOPMENT REGULATORY GUIDE 1.108 PERIODIC TESTING OF DIESEL GENERATOR UNITS USED AS ONSITE ELECTRIC POWER SYSTEMS AT NUCLEAR POWER PLANTS A. INTRODUCTION Criterion XI, "Test Control," of Appendix B, "Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants," to 10 CFR Part 50, "Licensing of Production and Utilization Facilities," requires that a test program be es- tablished to ensure that systems and components per- form satisfactorily and that the test program include operational tests during nuclear power plant opera- tion. Criterion 17, "Electric Power Systems," of Appen- dix A, "General Design Criteria for Nuclear Power Plants," to 10 CFR Part 50 requires that onsite electric power systems have sufficient independence, capacity, redundancy, and testability to perform their safety functions, assuming a single failure. Criterion 18, "Inspection and Testing of Electric Power Systems," of Appendix A to 10 CFR Part 50 requires that electric power systems important to safety be designed to permit appropriate periodic in- spection and testing to assess the continuity of the. systems and the coindition. of their components. This regulatory guide describes a method accep- table to the NRC staff for complying with the Com- mission's regulations with regard to periodic testing of diesel electric power units to ensure that the diesel electric power systems will meet their availability re- quirements. The Advisory Committee on Reactor Safeguards has been consulted concerning this guide and has concurred in the regulatory position. features if a loss of offsite power and an accident oc- cur during the same time period and (2) to provide power to equipment needed to maintain the plant in a safe condition if an extended loss of offsite power oc- curs. Diesel generator units are the most common source of onsite electric power. High reliability must be