Speaker
Dr
Kotaro Nakata
(CRIEPI)
Description
Radiocarbon (C-14) is recognized as a radionuclide that includes significant impact on public exposure in safety assessment of radioactive waste disposal. Its origin, generation mechanism and chemical forms in the wastes are required to be understood for the reasonable and proper safety assessment of the radioactive waste disposal. Some previous studies have reported occurrence of insoluble C-14 in PWR, and suggested that ion-exchange resin could be its origin. However, this hypothesis has not been well evidenced yet, because information about the generation mechanism and chemical form of the insoluble C-14 is still limited.
In this study, alternation of the resin under heating and/or irradiation was investigated to understand the alternation of the resin in PWR. In addition, characteristics of CRUD on a coolant filter for the actual PWR were compared to those of the heated/irradiated resin. The results suggested that the insoluble C-14 arises from alternation of the ion-exchange resin.
Primary author
Dr
Kotaro Nakata
(CRIEPI)
Co-authors
Mr
Akira Sakashita
(Mitsubishi Heavy Industries, LTD)
Dr
Daisuke Minato
(Central Research Institute of Electric Power Industry)
Mr
Kenichiro Kino
(Nucler Development Corporation)
Dr
Koichiro Takao
(Tokyo Institute of Technology)
Dr
Michihiko Hironaga
(Central Research Institute of Electric Power Industry)
Mr
Tetsuro Sakahihara
(Shikoku Electric Power Co,INC)
