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廃棄物等の水分蒸発挙動解析コード開発に向けた取組み

Development status of drying simulation code for waste storage

寺田 敦彦  ; 山岸 功 ; 日野 竜太郎

Terada, Atsuhiko; Yamagishi, Isao; Hino, Ryutaro

福島第一原子力発電所の事故にて発生した使用済みセシウム吸着塔の安定保管にあたって、塔内に残留する水分挙動を把握することは容器健全性の観点から重要である。本研究では、崩壊熱等の発熱による水分の相変化や毛管圧力による水分移動をモデル化した、容器内の乾燥過程を予測する2次元水分蒸発挙動コードについて、そのコード概要と模擬実験を対象とした試解析結果で得られた課題等を報告する。

At the decommissioning of the Fukushima Daiichi Nuclear Power Station, it is necessary to store seawater containing spent radioactive wastes such as cesium adsorbents safely. Since the increased seawater concentration with temperature affects the corrosion rate of vessel materials as a part of drying phenomena, a two-dimensional drying-process simulation code which installed correlations of capillary action, evaporation rate etc. has been developed in order to predict above-mentioned momentary situations caused by drying. Trial analytical results obtained with the code agreed well with the experimental results obtained under simple experimental conditions using an electric heater and a zeolite packed bed.

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