Abstract
This chapter presents a cost-effective approach to selection of the most diverse NPP Reactor Trip System (RTS) under uncertainty. The selection of a pair of primary and secondary RTS is named a diversity strategy. All possible strategies are evaluated on an ordinal scale with linguistic values provided by experts. These values express the expert's degree of confidence that evaluated variants of secondary RTS are different from primary RTS. All diversity strategies are evaluated on a set of linguistic diversity criteria, which are included in a corresponding diversity attribute. The generic fuzzy diversity score is an aggregation of the linguistic values provided by the experts to obtain a collective assessment of the secondary RTS's similarity (difference) with a primary one. This most rational diversity strategy is found during the exploitation stage, taking into consideration the fuzzy diversity score and cost of each strategy.
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