Research project implementation of a risk-based performance monitoring system for nuclear power plants: Phase II - Type-D indicators. Final report

摘要

This study has established the basis for incorporating a meaningful set of Type-D performance indicators into an overall performance monitoring system based on a PSA framework. The relationships developed as part of this study enable various organizational, maintenance, and operational influences, that are manifested through key events that can be identified and reported at a plant, to be accounted for in terms of their impacts on safety. The relationships and the capability they pose are significant new and unique developments. The relationships require that plant-specific data on the key performance indicators be acquired and analyzed. This, in turn, necessitates that a regular and systematic supplementary data collection program be implemented. Hence, it is recommended here that such a data program be developed and undertaken, specifically within the context of an overall PSA- based safety monitoring system. Plant licensees should be responsible for the supplemental data collection effort; however, the data collection requirements should not pose an undue burden on the licensees. To the extent possible, the data collection program should be coordinated, and possibly integrated, with existing licensee data collection and event reporting efforts. This study was undertaken to help verify whether or not it would be feasible to proceed with a PSA-based performance monitoring program. Research performed for Part-1 investigation has resulted in the development of a systematic and structured approach for monitoring safety performance based on all types of plant events. The Type-D relationships were earlier identified as a key element of the proposed performance monitoring system, and if it would be discovered that the Type-D relationships could not be practically developed and implemented, then it would have lead to the recognition that the performance monitoring system might have little practical value. On the other hand, if the Type-D relationships could be efficiently developed and implemented in a practical manner, then it would lead to the recognition that there would be a positive basis for proceeding with investigation of subsequent aspects of the performance monitoring system. These subsequent aspects have been identified as consisting of the two remaining parts of the overall performance monitoring research investigation, described as follows. Part 3 is intended to demonstrate the detailed implementation of the overall PSA-based performance monitoring approach, including application of the Type-D quantitative relationships to a case-study plant; and Part 4 is intended to develop programmatic and decision making guidelines, as well as needed software, for implementing the performance monitoring system at all Swedish NPPs, and for making regulatory use of the system. Since success has been achieved in the present Part-2 investigation (as well as in the earlier Part-1 study), it can be concluded that there is indeed a positive basis for pursuing subsequent development of the performance monitoring system. Consequently, it is recommended that the subsequent aspects of the research investigation be undertaken. Since the effort has broad applicability to plant operators and regulators, and the potential for significant benefits with respect to safety management and related decision making, it is also recommended that opportunities for colla