Reliability analysis of the system for continuous cleanup of WWER-440 nuclear power plant primary circuit water

A new potential for the practical use of the CAT-PREP-KITT computer code in reliability analysis of nuclear power plant components is outlined. The procedure is demonstrated on the primary circuit water continuous cleanup system of a WWER-400 nuclear power plant. Variant calculations were performed for the two loops, TC 10 and TC 50; the loops were found equivalent with respect to reliability. The calculated reliability characteristics of the TC 10 loop indicate that with an 80% probability at least one loop failure can be expected within a year of operation. One failure of the facility (which need not imply failure of the loop) can be expected roughly in 8 months of operation. The expected number of failures is low but any failure is significant with respect to loop failure. (Z.S.). 5 tabs., 4 figs., 8 refs