Preliminary study of the criticality monitoring method based on the simulation for the activity ratio of short half-life noble-gas fission products from fuel debris

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

We investigated the possibility of estimating the effective neutron multiplication factor ( ${it k$_{eff}$}$ ) of the fuel debris inside the canister and primary containment vessel (PCV) of Unit 2 of the Fukushima Daiichi Nuclear Power Station (1F) using remote gas-radioactivity measurement via simulation-based calculations. Our results demonstrate an almost linear correlation between ${it k$_{eff}$}$ and the $^{88}$ Kr-to- $^{135}$ Xe activity ratio with respect to various fuel debris compositions. This correlation is maintained regardless of geometries such as the fuel debris canister and the PCV.

Language	:	English
Journal	:	Journal of Nuclear Science and Technology
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Pages	:	8 Pages
Publication Year/Month	:	2024/00
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Paper URL	:	https://doi.org/10.1080/00223131.2023.2300773
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Keywords	:	福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident; Subcritical System; Depletion calculation; Spontaneous fission; Short half-life fission product; Monte Carlo Calculation; Activity ratio; Criticality
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Registration No. : AA20230175
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