A Basic study for immobilization of radioactive polluted water derived from the Accident at Fukushima Nuclear Power Stations of Tokyo Electric Power Company using borate glass

Matsushima, Ryotatsu* ; Arai, Tsuyoshi*; Horiguchi, Kenichi ; Sugaya, Atsushi 

A mass of radioactive polluted water that arisen from the Accident at Fukushima Nuclear Power Stations is just stored on the sites. We presume the polluted water contains sodium chloride and boric acid; therefore, developments of new immobilization matrices suitable for these chemicals are required. In this study, it was focused attention on borate glass based immobilization with the use of boric acid in the polluted water. In our previous work, it was confirmed that a borate glass is formed when boric acid and sodium chloride powder were used in a molar ratio 1:0.5 and they were melted at 1100C for three hours. A borate glass will be formed if chlorine is volatilized from the glass. In this time, we studied on thermal behaviors during forming a glass to make sure that chlorine is volatilized from the glass.