Refine your search:     
Report No.

Estimation of Ra concentration in high-level radioactive waste disposal system

Yoshida, Yasushi*; Yoshikawa, Hideki

Ra is one of the important radionuclide for performance assessment of HLW. Concentration of Ra in groundwater is limited by an interaction with calcite. Incorporation of Ra can be evaluated by partition coefficient. In addition to this parameter, a number of surface layers which contribute ion substitution reaction is also necessary for calculation. Therefore experiments were carried out. As a result, a number of surface layers of calcite is estimated as 15to 44. Those values are consistent with estimated value in literature. With this number of layers, the migration analysis of 4n+2 series radionuclides were performed with reaction of calcite. This effect can be evaluated with partition coefficient. As a result, release rates of Ra was largest in their series on an outer surface of engineered barrier and about one order magnitude lower than that for radionuclide of highest release rate at the point of 100 m in rock.



- Accesses





[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.