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Report No.

Study on the criticality monitoring method by measurements of short-half-life noble-gas fission products for the criticality monitoring of fuel debris inside a primary containment vessel of Fukushima Daiichi Nuclear Power Stations

Riyana, E. S.   ; Sakamoto, Masahiro ; Matsumura, Taichi ; Terashima, Kenichi  ; Okumura, Keisuke 

We investigated the possibility of estimating the effective neutron multiplication factor (keff) of the fuel-debris inside the primary containment vessel (PCV) of unit-2 of Fukushima Daiichi Nuclear Power Station (1F) using remote gas-radioactivity measurement. Our calculation result demonstrates the correlation between keff and the activity ratio (AR) of $$^{88}$$Kr-to-$$^{135}$$Xe for various fuel debris compositions and geometry. We also show the time-dependent behavior of the AR of $$^{88}$$Kr-to-$$^{135}$$Xe when the keff changes suddenly in PCV.



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