[3B01-04] Decommissioning of Fukushima Daiichi NPP 5

[3B03] 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

*Yoichi Arai^1,2, Seiya Suzuki^1,2, Nobuo Okamura^1,2, Masayuki Watanabe^1,2, Shohei Kawano^1,3, Yoshiyuki Kawaharada^1,3 (1. IRID, 2. JAEA, 3. TOSHIBA ESS)

Keywords:non-soluble adsorbent, fuel debris, drying curve

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.