BWR pilot plant life extension study at the Monticello Plant: Phase 1: Final report

The purpose of the Phase 1 BWR pilot plant life extension program is to examine, in greater detail than previously accomplished, the major components in a BWR with extensive operating history, and to identify the primary degradation parameters with an attempt to establish degradation rates and useful life goals. This was accomplished by developing the methodology to prioritize and select ''Critical Components'' representing a variety of diverse equipment and structures. For each of the 27 selected components, detailed assessments were conducted, by reviewing design and records data, evaluating operational history, interrogating national equipment data bases, conducting in-plant condition assessments and testing, and identifying specific actions necessary to achieve projected life goals. The recommendations concentrate on early preventive actions, operational records, maintenance, inspection, testing, surveillance and monitoring activities. Research and development subjects are identified as necessary to support and verify the technical conclusions. This project also provides a methodology and procedures for a systematic initial life extension assessment for other BWRs, and presents the economic and planning strategies associated with extended operation. The Phase 1 report should be considered as a first step towards a larger industry effort to achieve a comprehensive license renewal policy