Accelerated leach test for low-level radioactive waste forms in the Hungarian NPP Paks

摘要

An accelerated leach test method was used for low-level radioactive evaporator residue waste forms in the Hungarian NPP Paks. Experiments were performed using cylinders prepared form Hungarian cement type CEM I 32, 5 LH and CEM III/B 32, N-LH/SR. Each cylinder was made using cement or cement plus additive using radioactive evaporator residue waste water. The cemented radioactive material was evaporator bottom residue, containing 134Cs, 137Cs and 60Co as main radioactive components. Leach tests were performed according to ASTM C 1308-08 standard. A computer program (ILT15) associated with the accelerated leach test was developed based on the ASTM C 1308-08 standard. Literature test and measured leaching data were analysed to assess whether the model for diffusion from a finite cylinder describes leaching from cement based waste forms. In this paper some of the experimental and modelling works used to validate the test method are presented.