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Report No.

Development of instruments for improved safety measure for LWRs

Takeuchi, Tomoaki   ; Shibata, Akira ; Nagata, Hiroshi ; Miura, Kuniaki*; Sano, Tadafumi*; Kimura, Nobuaki ; Otsuka, Noriaki ; Saito, Takashi; Nakamura, Jinichi ; Tsuchiya, Kunihiko 

In-pile instrumentation systems in present LWR's are indispensable to monitor all situations during reactor operation and reactor shut down. However, those systems did not work sufficiently under the conditions of the severe accident at the Fukushima Dai-ichi (F1) Nuclear Power Plant. Based on instrumentation and irradiation experiences accumulated in JMTR, the developments of reactor instrumentation systems to prevent severe core damage accident in advance have been started. The development objects are water level gauge utilizing $$gamma$$ heating, self-powered $$gamma$$-ray detector, hydrogen concentration gauge, and analysis system for imaging and quantification of in-reactor information using Cherenkov light.



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