Hitachi, Ltd.

Hitachi Engineering Services Co., Ltd.

Hitachi Nuclear Engineering Co., Ltd.

Ryozo Kikkawa

Susumu Horiuchi

Masaki Takeshima

Tatsuo Izumida

Hiroyuki Tsuchiya

Yoshimasa Kiuchi

Yasuo Hattori

Keishi Monden

The present invention relates to a method for treating radioactive laundry waste water generated from a nuclear power plant, nuclear fuel reprocessing plant, or radioactive nuclides handling facilities, and provides a method for treating the waste water safely and for reducing the volume of generated radioactive waste to a minimum. Radioactive laundry waste water containing a detergent of which major contents are a nonionic surface active agent and inorganic builders is concentrated by an evaporating concentrator, the concentrated waste water is dried and pulverized to dry powder by a rotary centrifugal thin film dryer, and the dry powder is incinerated. By using the above detergent, foaming at the concentration can be reduced, and the concentrated waste water can be easily dried and pulverized. Further, the dried powder can be incinerated stably and safely without influencing undesirable effect on the body of the incinerator. In accordance with the present invention, laundry waste water can be treated simply and safely, and the final volume of radioactive waste can be reduced to minimum.

Method for treating radioactive laundry waste water

A system for disposing radioactive waste by solidifying the waste. The system has a lifting/lowering device for causing a relative vertical movement to bring a thin-walled container made of an inorganic material and a filling cap into contact with and away from each other. Supplying means are provided for supplying the container with the radioactive waste, solidifier and the post-filling solidifier, respectively, through the filling cap when the latter is held in contact with the container. The system further has a capping means for capping the container after filling with the radioactive waste and the solidifier. According to the invention, it is possible to conduct the essential steps such as the filling with the radioactive waste, filling with the solidifier, capping and the post-filling with minimal equipment and space.

Solidifying disposal system for radioactive waste

Liquid wastes from atomic power plants are treated in an apparatus comprising a low electroconductivity liquid waste concentrator for evaporating a low electroconductivity liquid waste with outside steam as a heat source, and another liquid waste concentrator for evaporating another liquid waste with steam generated by evaporation of the low electroconductivity liquid waste in the low electroconductivity liquid waste concentrator as a heat source.

Apparatus for treating radioactive liquid wastes

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Hitachi, Japan

Ryozo Kikkawa