Groundwater path radiological impact assessment for the derivation of specific clearance levels for landfill disposed waste at Ignalina NPP

Abstract

Industrial waste generated from the operation of Ignalina NPP was disposed of in industrial waste dumps, the so-called “landfill facility”. At the time of disposal, the waste was considered as non-radioactive. Due to changes in the regulatory requirements, a part of the waste was reclassified to a very low-level radioactive waste. The Ignalina NPP final decommissioning plan foresees the development of specific clearance levels for the disposed of waste. Application of specific clearance would allow removal from regulatory control and conversion of the existing landfill into a conventional waste disposal facility.This paper focuses on the modeling of radionuclide release and dispersion by different groundwater pathways, calculation of associated radiological impacts and definition of specific clearance levels for the landfill facility disposed of waste. The radionuclides considered in the assessment are based on the waste specific and include 3H, 60Co, 94Nb, 137Cs and 241Am. Modeling is performed using GOLDSIM software.