Safety assessment of the low and intermediate level radioactive waste near-surface repository for Stabatiškė site (Lithuania)

Abstract

A computer code FEFLOW 5.0 was applied for simulating transport of the most mobile radionuclides ( 3 H, 14 C, and 129 I) with groundwater from the designed low and intermediate level radioactive waste near-surface repository at Stabatiškė site. An analysis of the variability of the model parameters of hydrogeological system such as dispersivity, hydraulic conductivity, porosity, and radionuclide solid / liquid distribution coefficient (K d ) has been made. The obtained results show that the activity concentration of the most mobile radionuclides in aquifer will remain low for a long time after the repository closure and the conservatively predicted maximal annual effective dose (8.9·10−3 mSv/y) to the inhabitant will be much lower than the dose constraint (0.2 mSv/y).

Background and anthropogenic radionuclide derived dose rates to freshwater ecosystem – Nuclear power plant cooling pond – Reference organisms

“…The level of detail in the characterization of parameter uncertainty depends on the availability of site-specific data presented in Table 2. For example, the site-specific hydrological and meteorological data (Mazeika, 2002;LEI, 2006;Jakimaviciute-Maseliene et al, 2007) have been applied in the modelling of the three infiltration scenarios. The initial activity concentration is assumed to be the value expected at the time of closure of this class A facility (IAEA, 2003;LEI, 2006).…”

Assessment of Tritium Activity in Groundwater at the Nuclear Objects Sites in Lithuania

“…A confined low permeable layer from below occurs at altitude of 124 m a.s.l. and represents continuous aquitard [16].…”