燃料デブリの臨界管理技術の開発,55; 水ガラス系中性子吸収材を被覆した燃料デブリの乾燥挙動の評価

Criticality control technique development for Fukushima Daiichi fuel debris, 55; Evaluation for the drying behavior of fuel debris covered with water glass based neutron absorber

鈴木 誠矢 ; 荒井 陽一  ; 岡村 信生 ; 渡部 雅之; 川野 昌平*; 川原田 義幸*

Suzuki, Seiya; Arai, Yoichi; Okamura, Nobuo; Watanabe, Masayuki; Kawano, Shohei*; Kawarada, Yoshiyuki*

福島第一原子力発電所の燃料デブリ取出し時の臨界防止用に、水ガラスを主成分として酸化ガドリニウムを混合した固化型非溶解性中性子吸収材の開発を進めている。燃料デブリ表面に水ガラス吸収材を被覆した状態での乾燥挙動への評価を評価するため、模擬試験体を用いて実施した試験結果を報告する。

The water glass type neutron absorber has been developed as a measure to precaution of re-criticality during fuel debris retrieval. Since the neutron absorber covers the surface of the fuel debris, the drying of the water content of the fuel debris was suggested to be hindered. The drying test using the mock test piece was carried out in order to evaluate the effect on the drying behavior when the surface of the fuel debris is covered with the neutron absorber. We investigate the drying characteristic curve of the mock test piece by thermogravimetric analysis, and report the evaluation of drying behavior.