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Report No.

Fundamental study on immobilization of sludge generated from treatment of remaining water used for cooling of the stricken power reactors

Amamoto, Ippei; Kobayashi, Hidekazu ; Yokozawa, Takuma; Yamashita, Teruo ; Nagai, Takayuki ; Suzuki, Yoshikazu*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*

The great amount of water used for cooling the stricken reactors at Fukushima Dai-ichi Nuclear Power Plant following the earthquake and tsunami of 11 March 2011 had resulted in accumulation of "remaining water" in some buildings. From public announcements, it seems likely the decontamination process of La Hague reprocessing plant would be employed as one of the treatment processes for the remaining water contaminated by FPs such as Cs, Sr, etc.. Based on literature study, Cs would precipitate with ferrocyanide compound as well as Sr with BaSO$$_{4}$$ by applying the above-mentioned process. In this study, BaSO$$_{4}$$ as the simulated sludge was loaded into the iron phosphate glass (IPG) medium under different melting temperature. Based on the results, the performance of IPG containing BaO (decomposed from BaSO$$_{4}$$) improved with increase loading of BaO up to 48 mol% at lower melting temperature.



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