Document: NRC Regulatory Guide
Document ID: 9e5c28ce-3a04-491c-8c21-07d90622ba1b
Document Type: regulatory_guide
Title: Guide for Assessing, Monitoring, and Mitigating Aging Effects on Electrical Equipment Used in Production and Utilization Facilities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2128/ML21288A115.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.248
CFR Part: 
CFR Title: 

Content:
period (e.g., initial 40 years) as well as extended operations under license renewal and subsequent license renewal periods of operation (60 to 80 years). Background Nuclear power generating stations licensed under 10 CFR Part 50 and 10 CFR Part 52 are required, under 10 CFR 50.65, to monitor the performance or condition of SSCs against licensee- established goals, in a manner sufficient to provide reasonable assurance that these SSCs are capable of fulfilling their intended functions. These goals shall be established commensurate with safety and, where practical, take into account industrywide operating experience. When the performance or condition of SSCs does not meet established goals, appropriate corrective action shall be taken. The integrity of SSCs is monitored, in part, through periodic surveillance testing and performance monitoring at a system level. However, surveillance testing and performance monitoring may not specifically focus on each component and may not be sufficient to detect all the aging and degradation mechanisms to which a particular piece of equipment or component is susceptible. Also, while surveillance tests can demonstrate the function and current performance of the equipment and components under test conditions, the tests do not verify the continued successful performance of equipment and components when they are called upon to operate under their worst case design loading conditions for extended periods when aging phenomena can appear (e.g., years of future service), as they would under anticipated normal service operating conditions or under design-basis accident conditions. Therefore, periodic surveillance testing of associated equipment may not provide specific information on the status of aging degradation processes or physical integrity of the aggregate parts and components. Consequently, a component with undetected damage or degraded condition could pass a system functional test but still fail unexpectedly when called upon to