Impact of Updated OECD/NEA Thermodynamic Database on the Safety Assessment of Radioactive Waste Repository Studied Using RESRAD-OFFSITE Code

A RESRAD-OFFISTE computational code for the safety assessment model of a radioactive waste repository was utilized to evaluate influence updated OECD/NEA thermodynamic database on in terms exposure dose. The solubility data as input parameter RESRAD-OFFSITE obtained with two different sets chemical databases such JAEA-TDB and amended reflecting updates were calculated compared each other. As result, almost identical doses due remarkable similarity between various radionuclides both databases. In contrast, dramatic changes dose observed varying distribution coefficients. Thermodynamic calculations indicated that aqueous species can be significantly changed by selection thus relevant coefficient also influenced consequence. Accordingly, result present work (i) impact somewhat minor from viewpoint (ii) coefficient, which sensitively predominant species, produced change This provided an insight into precise calculation reliable estimation means surface complexation model, predict function groundwater composition coupled speciation based up date data.