Chichibu Cement Co., Ltd.

Ozawa Concrete Industry Co., Ltd.

Ngk Insulators, Inc.

Kanjiro Ishizaki

Osamu Suzuki

Seiichi Ozawa

Shizuko Kushida

Yutaka Kanagawa

Mitsuzo Ozawa

Seiichi Ozawa, Deceased

Akira Asami

A solidification processing apparatus for radioactive waste materials comprises a tank for a solidifying agent for solidifying the radioactive waste materials, a waste material vessel connected to the tank for the radioactive waste materials, a pouring control unit for controlling pouring of the solidifying agent into the vessel, and a heating and curing chamber for heating the vessel by an indirect heating unit after pouring the solidifying agent onto the waste materials in the vessel to polymerize and set the solidifying agent, thereby solidifying the radioactive waste materials. With this arrangement, the solidifying agent superior in impregnation is poured into a vessel filled with radioactive waste materials, whose poured amount is controlled by the pouring control unit. After pouring the solidifying agent into the vessel, the vessel is heated indirectly by an indirect heating unit in order to avoid deflagration if the solidifying agent is combustible. The solidifying agent is polymerized and set in a relatively short time by promoting the polymerization reaction of the agent to solidify the radioactive waste materials with stability.

Solidification processing apparatus for radioactive waste materials

A pressure-regulating device for impact-resistant containers used for storage, transportation and disposal of hazardous waste materials, is herein disclosed, which comprises a vent fixed to the lid of said container to keep the gaseous phase pressure inside said container at a positive pressure of 50% or less of the pressure resistance of said container, the vent being columnar and made of an alumina-based sintered ceramic and having a porosity of 50% or less, a pore diameter range of 0.4 to 1.4 .mu. and a length (mm)/cross-sectional area (mm.sup.2) ratio of 2 to 10.

Pressure-regulating device for use in storage, transportation and

A high integrity container having a three-layered structure that is suitable as a container for use in storage and disposal of radioactive wastes or industrial wastes can be fabricated by casting a concrete lining as an inner layer on the inner surface of a metallic vessel as an outer layer, reinforcing the concrete lining with a reinforcing material and strengthening the concrete lining with an impregnant, and polymerizing and curing the impregnant layer that is formed as an intermediate layer between said metal drum and the concrete lining.

Process for producing a high integrity container

A multiplex design container, is herein disclosed, that comprises a metallic vessel as an outer layer, a concrete lining as an inner layer that is formed on the inner surface of the metallic vessel and which is reinforced with a reinforcing material and strengthened with an impregnant, and a polymerized and cured impregnant layer as an intermediate layer that is formed between said metallic vessel and the concrete lining.

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Saitama, Japan

Kanjiro Ishizaki