Improvement of bitumen-waste product in leachability—Leachability of bitumen product containing BWR's evaporator concentrate |
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Authors: | Noboru Moriyama Hideo Matsuzuru Shigeru Dojiri |
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Affiliation: | Division of Environmental Safety Research, Reactor Safety Research Centre, Japan Atomic Energy Research Institute, Tokai, Ibaraki, 319-11 Japan |
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Abstract: | The method has been developed to improve the bitumen product which incorporates an evaporator concentrate from a BWR, with respect to the swelling and leaching. The leachability of the product has been measured by the method recommended by the IAEA. The swelling of the product is successfully prevented by the addition of calcium chloride. The specimen containing the waste up to Wa/B (Weight ratio of Na2SO4 + CaCl2 and bitumen) = 60:40 shows no pronounced swelling, when it is immersed in water. The cumulative fractions of 137Cs and 60Co leached from a specimen which does not contain CaCl2 are 0.65 and 0.2 at the leaching time of 30 days. On the hand, the corresponding value at 100 days for the specimen with calcium chloride addition is 5 × 10?4 for 137Cs and 1 × 10?4 for 60Co. The coating of the specimen surface with a fresh bitumen (5 mm thickness) reduces the leachability further. These results indicate that this method is effective to improve the bitumen product incorporating BWR's evaporator concentrate. |
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