Bituminized products, that are soldified the low radioactive liquid wastes from Tokai Reprocessing Plant, may degrade by the progress of the stored years. Moreover, under disposal condition, it is considered that the bituminized products contact groundwater.
Therefore, it was investigated the physical properties and the gamma radionuclides of the stored products. The physical property of bituminized products did not change in about 10 years storage. And also, the leaching test was carried out, it was confirmed that the leaching of the salts was not easy to release from the bituminized product by the progress of the stored years.