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概要

A new risN monitor system has been under development which can be applied not only to prevent severe accident in daily operation but also to serve to mitigate radiological hazard just after severe accident happens. The system is composed by plant DiD (Defence-in Depth) risN monitor and reliability monitor. The plant DiD risN monitor can describe versatile scenarios of human-machine interaction in accident situation by utilizing UML (Unified Modeling Language) so as to serve as a useful tool of accident management. The employed methods in the plant DiD risN monitor are briefly explained first and then typical applications of the plant DiD risN monitor are introduced: one is the simulation of emergency procedure for managing severe accident in conventional PWR plant in Japan, and the other is the designing of digital HIS to monitor plant state in SBLOCA in passive safety PWR of AP1000.

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