Risk Profile Methodology of Plant Configurations and Pilot Applications: Lessons211 Learned

摘要

A summary is presented of (1) a risk-based methodology for developing time-211u001edependent risk profiles of plant operational configurations (both retrospective 211u001eand prospective profiles) and (2) lessons learned from visits to pilot plants. 211u001eThe methodology focuses on the determination of plant configuration-risk profiles 211u001eusing plant operating records or actual real-time equipment unavailabilities due 211u001eto operational activities. This methodology employs state-of-the-art 211u001eProbabilistic Risk Assessment methods and risk models, and uses available 211u001ecomputer codes and various quantification techniques. The risk profile emphasizes 211u001ethe risk changes with respect to a reference risk level that is defined on the 211u001ebasis of the plant baseline configuration. The limitations (1) of risk models and 211u001esensitivity to risk contributors and (2) of computation methods are discussed 211u001ewithin the scope of developing risk profiles. Results and lessons learned from 211u001ethe trial applications at six pilot plant sites are also presented.