Abstract
A conceptual approach is proposed to determining the minimum achievable number of control organs in the safety and control system and the minimum effectiveness of emergency shielding of VVER reactors. This approach includes a new probabilistic method of determining the effectiveness of emergency shielding with failures of different numbers of control organs and a decrease in the excess conservatism in performing thermohydraulic analysis. The modern safety ideology is used. For VVER-1000, it is shown that emergency shielding with 49 control organs is sufficient for the determining anticipated accident with steam-pipe rupture.
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