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

[3B04] 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

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

Keywords:non-soluble absorbent, 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. 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.