A COMMODITY APPROACH TO AGING MANAGEMENT REVIEW OF SUPPORTS FOR LICENSE RENEWAL

摘要

10CFR Part 54 requires that nuclear power plant licensees who seek renewal of their operating licenses for an additional 20 years of operation (i.e., for a total operating life of 60 years) perform an Integrated Plant Assessment (IPA) on all systems, structures and components (SSCs) within the scope of license renewal. The IPA must demonstrate that the effects of age-related degradation are being managed to ensure that the intended functions of these SSCs are maintained consistent with the plant's current licensing basis during the period of extended operation. One of the specific requirements of 10CFR §54.21, "Contents of application-technical information," is that an aging management review be performed for long-lived structures and components "that perform an intended function . . . without moving parts or without a change in configuration or properties." Such items include component supports. Baltimore Gas and Electric (BGE) and MPR Associates, Inc., have recently completed an aging management review of component supports for Calvert Cliffs Nuclear Power Plant (CCNPP). A commodity approach was used on the basis that component supports perform essentially the same function regardless of the system with which they are associated. This approach, i.e., treating component supports as commodities as opposed to performing the aging management review for each individual component support, resulted in a cost-effective approach for this portion of the IPA. An important feature of the aging management review of component support at CCNPP is the evaluation of the adequacy of existing programs to manage component support aging. Two major programs were included in the evaluation: the ASME Section XI In-Service Inspection (ISI) Program, and CCNPP's Seismic Verification Project to resolve USI A-46. The key role that these programs play in the overall aging management strategy for component supports, as well as the evaluation of other on-going activities which complete the aging management approach for component supports, are discussed.