Studies of leakage of radionuclides from the radioactive waste reservoir and evaluation of possible internal irradiation

Abstract

In addition, MOC3D code was used for modelling 3H transport in groundwater. Results of modelling show that volumetric activity decreases receding from the reservoir, while volumetric activity of tritium will be about 10000 Bq[...] in the location near the reservoir, and will be comparable to background values at ~500 m from the reservoir. Volumetric activity of 137Cs in groundwater ranges from negligible values to 64 Bq[...]. It can fluctuate by the order of magnitude in the same borehole year by year. 90Sr and 239,240Pu activity concentrations in soil were measured in 1997. The results imply the leakage of some radionuclides stored in the repository. Calculated hypothetical average annual dose in the period are 0.088 mSv[...] due to ingestion of 3H, 0.14 mSv[...] due to 137Cs and 0.00087 mSv[...] from 90Sr.