Time dependent correlation between the criticality and short-half-life noble-gas fission products of fuel debris

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

The activity ratio of short half-life noble gas fission products, $^{88}$ Kr to $^{135}$ Xe (A( $^{88}$ Kr/ $^{135}$ Xe)), has close relationship with the criticality ( ${it k$_{eff}$}$ ) in the primary containment vessel (PCV) or fuel debris canister, in which fuel debris are accumulated. In this paper, we investigated the time-dependence of the A( $^{88}$ Kr/ $^{135}$ Xe) when the ${it k$_{eff}$}$ changes according to an incident such as the change of geometry in the PCV. Our calculation shows a slow change of the A( $^{88}$ Kr/ $^{135}$ Xe) value with the maximum or minimum values before settling in a new stable value after several hours from the ${it k$_{eff}$}$ change. The applicability and the suitability of the A( $^{88}$ Kr/ $^{135}$ Xe) time-dependent measurement is discussed for the monitoring of the ${it k$_{eff}$}$ in PCV.

Language	:	English
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Meeting title	:	International Topical Workshop on Fukushima-Daiichi Decommissioning Research 2024 (FDR2024)
Held date	:	2024/10
Location (city)	:	Naraha
Location (country)	:	Japan
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Keywords	:	福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident; Fuel Debris; Subcritical System; neutron multiplication factor; activity ratio of $^{88}$ Kr to $^{135}$ Xe
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Registration No. : BB20240700
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