Method and apparatus for treatment of radioactive wastes
AssigneeHitachi, Ltd.
InventorsSusumu Horiuchi, Takashi Taniguchi, Masaki Takeshima, Mikio Hirano, Hideo Yusa
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Abstract
A radioactive waste discharged from a radioactive substance handling equipment is dried and powdered, and the powder is pelletized. The resulting pellets are stored in an inner vessel of a store vessel having a double structure for a predetermined period to attenuate the radioactivity of the pellets. Then, the pellets are taken out from the store vessel and packed into a sealing vessel. A binder is injected into the sealing vessel to effect solidification.
Claims16
An apparatus for the treatment of radioactive wastes, which comprises a drying device for drying and powdering a radioactive waste discharged from a source of wet radioactive waste material, a granulator for pelletizing the powder of the radioactive waste, a storage means for temporarily storing a large mass of the initially formed pellets for a predetermined period for attenuating the radioactivity of the pellets, said storage means including shielding means for preventing leakage of radioactivity into the atmosphere surrounding said storage means, a pellet transporting means for transporting the initially formed pellets from the granulator to the storage means, with the amount of pellets being transported being controlled so that the surface dose of radioactivity of the transported pellets is maintained at a predetermined allowable level, a sealing vessel for packing a smaller mass of the radioactivity-attenuated pellets together with a binder, and a pellet treating device for taking out the smaller mass of the pellets from the storage means and transporting the smaller mass of pellets into the sealing vessel.
A method for the treatment of radioactive wastes which comprises drying and powdering a radioactive waste discharged from a source of radioactive waste material, pelletizing the resulting powder, transporting the resulting pellets into a storage means, temporarily storing the pellets in the storage means for a predetermined period and preventing leakage of radioactivity from said storage means during said temporary storage, taking out the pellets from the storage means, packing the pellets in a sealing vessel and injecting a binder into the sealing vessel;
- the amount of pellets stored in the storing means being sufficient to supply a plurality of sealing vessels.
Dependencies are inferred from the claim text.