燃料デブリの臨界管理技術の開発,54; 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試験概要

Criticality control technique development for Fukushima Daiichi fuel debris, 54; Outline of study on the drying behavior of fuel debris covered with water glass based neutron absorber

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

Arai, Yoichi; Suzuki, Seiya; Okamura, Nobuo; Watanabe, Masayuki; Kawano, Shohei*; Kawaharada, 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(以下、水ガラス吸収材)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影響を評価するために実施した模擬試験体を用いた試験概要や予備検討に関して報告する。

The water glass type neutron absorber has been developed as a measure to precaution of re-criticality during fuel debris retrieval from nuclear reactor, etc. Since the surface of the fuel debris is covered with the neutron absorber, the coating of the neutron absorber was suggested to inhibit the evaporation of water in the debris during the drying process of fuel debris. 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. The outline and basic study of the drying test will be reported in this presentation.