LOW AND INTERMEDIATE LEVEL RADIOACTIVE WASTE DISPOSAL IN FR YUGOSLAVIA ENGINEERED TRENCH SYSTEM TYPE

摘要

As a concept for final disposal of low and intermediate level radioactive waste materials in FR Yugoslavia, shallow land burial system in a form of engineered trenches is adopted. Radioactive waste materials that are collected till nowadays, originated from research reactor and radionuclide applications in industry, medicine and universities, are placed in two interim storages. Either solid and liquid radioactive waste materials, after certain pretreatment and treatment steps, will be immobilized by cementation process, dominantly. Immobilized waste forms should solidified in the 200 litre and 300 litre metal drums or in the concrete containers of approximately 3m3 volume. Radioactive waste materials that are already immobilized and solidified and brought to the disposal facility in the ISO standardized transport and disposal containers, should be placed in the trench directly. Disposal facility is designed as an engineered trench system, divided in a honeycomb form. Each honeycomb cell will have its own independent drainage system and cover, during the operational phase. Pipe-line network will collect any drained liquids from trench cells to a central pipe-line, wherefrom drained liquid should be inspected on radionuclide presence. Trench cells will be filled in sequences, with the movable cover above them, in aim to prevent any contact of radioactive waste forms in inactive containers and rainwater and snow. As each part of trench is fulfilled, it should be covered with the several layers of inactive, low permeable materials. Area provided for final disposal facility with all auxiliary facilities is approximately 1 km2, having a designed capacity of 30,000 drums of 200 litre and 5,000 drums of 300 litre. Due to the specific activity bonded in certain immobilized forms, drums with the highest contact doses will be placed in the central parts of the disposal facility. Two metre wide layer of pressed clay is going to be used as a buffer material in the surroundings of the disposal facility. Inclination of the terrain should be 1 percent. Meteorological station will be placed at the disposal site, as well as on-line system for the detection of any air-bore radionuclides, that might occurred on the site (volatile radionuclides, such as: ~(226)Ra,~(222)Rn). On the site, facility for concrete containers preparation, facility for immobilization of the row radioactive waste materials brought for disposal, facility for solid radioactive waste materials volume reduction and auxiliary facilities will be built. Since FR Yugoslavia does not have nuclear programme established, expectations are that the designed disposal facility should conform all the needs in disposing radioactive waste materials for at least 300 years.