Expansion of Passive Safety Function

Abstract

Expansion of passive safety function is proposed. Two notions are presented. One is that in the design of passive safety nuclear reactors where aversion of active components is stressed, some active components are purposely introduced, through which a system is so built as to behave in an apparently passive manner. The second notion is that instead of using passive safety function in its sole way, passive safety function is combined with some active components, leaving the passivity in safety action with the enhanced controllability in normal operation. "Non-Dormant System" which we propose is one example to the former. In this system, standby safety system is turned portion of the normal operation system let worked non-dormantly. Interpretation to Non-Dormant System via Synergetics-wise viewpoint is made. As an example to the latter, PIUS Density Lock aided with active components is proposed and is discussed.