Evaluation of HLW glass dissolution/alteration kinetics by using micro-channel flow-through test method; Initial glass dissolution rate as a function of pH and temperature

Inagaki, Yaohiro*; Sakatani, Keiichi*; Yamamura, Yuki*; Mitsui, Seiichiro; Noshita, Kenji*; Miura, Yoshiyuki*; Kanehira, Norio*; Ochi, Eiji*; Mukunoki, Atsushi*; Chiba, Tamotsu*

Dai-7-Kai Saishori, Risaikuru Bukai Semina Tekisuto, p.136 - 137, 2011/01

Conventional static test methods are not appropriate to evaluate glass dissolution behavior at an arbitrarily-fixed condition due to compositional change of the solution with glass dissolution. In this study, we applied a newly-devised micro-channel flow-through test method to measurement of the initial dissolution rates of Japanese simulated waste glasses, JAEA-P0798 and JNFL-KMOC, at arbitrarily-fixed conditions and we evaluated temperature and pH dependence of glass dissolution. The results showed that the initial dissolution rate increased with temperature and had "V-shaped" pH dependence at each temperature.

Conceptual Design Phase II of Disposal Facility below the Generaly used Depth for RI Laboratory and so on

Kobayashi, Wataru*; Nakagawa, Tatsuo*; Mukunoki, Atsushi*; Goto, Kikuji*

JNC TJ8400 2003-043, 168 Pages, 2003/02

JNC-TJ8400-2003-043.pdf:4.08MB

Radioisotopes, nuclear fuel materials, and so on have been used in the various fields such as the research activities of universities and research institutes or the treatment and diagnosis of the medical institutes. It is necessary to treat and dispose of radioactive wastes safely and economically. A fundamental examination was carried out in the Conceptual Design Phase I of Disposal Facility below the generally used Depth for RI Laboratory Wastes and so on in last year. Based on the latest wastes data, the reevaluation of the facility design and the safety evaluation were enforced toward the examination result in last year. And it was examined about the operation procedure that includes wastes reception and disposal place closing. Furthermore, economic evaluation about the disposal was enforced.