ON THE NEED OF THE COORDINATED OPTIMIZATION OFTECHNICAL SPECIFICATIONS AND MAINTENANCE

摘要

Optimization of Technical Specification requirements and Maintenance (TS&M) has beenrnfound interesting from the very beginning at Nuclear Power Plants (NPPs). However, the resolutionrnof such a kind of optimization problem has been limited to focus only on individual TS&M-relatedrnparameters (STI, AOT, PM frequency, etc.) and/or adopting an individual optimization criterionrn(availability, costs, plant risks, etc.). Nevertheless, a number of reasons exist (e.g. interaction,rnsimilar scope, etc.) that justify the interest to focus on the coordinated optimization of TS&M. Thernpurpose of this paper is on demonstrating the need of the coordinated optimization of TSrnrequirements and Maintenance at NPPs. The objective function and constraints for the simultaneousrnand multi-criteria optimization of TS&M activities based on risk and cost functions at system levelrnare derived (unavailability of the safety-related system and the associated cost respectively), whichrndepend on relevant TS&M-related parameters. A case of application is provided for a stand-byrnsafety-related system, which demonstrates how the optimized values depend on the particularrnTS&M-related parameters being involved in the optimization process.