US 2014/0228612 A1Published application

Process and device for reducing radioactive material of object containing radioactive material to safe level in living environment

AssigneesRadwaste and Decommissioning Center, Cdm Consulting Co., Ltd.

InventorsShigeto Hayafuji, Takeshi Kamaya, Hiroshi Hayakawa, Yasuhiro Jinbo, Kaname Mogami, Kenji Takeshita, Masanori Aritomi, Kunio Yoshikawa, Saburo Kikuchi, Akio Ishido

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Abstract

Provided are a process and device for reducing radioactive material of an object containing the radioactive material to a safe level in a living environment. Included are a step of performing at least a step of carrying out a heating process on the object, into which radioactive material is absorbed and/or adsorbed from an environment or which absorbs and/or adsorbs radioactive material from an environment, in a state where temperature is less than or equal to the critical temperature of water and pressure is greater than or equal to the saturated vapor pressure of water, or a step of abruptly releasing the pressure; and a step of separating, after the above step, into liquid and solid.

Claims30

Dependent claims

A process for reducing radioactive material of an object containing the radioactive material to a safe level in a living environment, comprising:

the object being at least one selected from the group consisting of an organism, a sewage sludge, a soil and an incineration ash, or which absorbed and/or adsorbed the radioactive material from an environment,
a heating/pressurizing/pressure release step selected from the group consisting of a step of carrying out a heating process on the object in a state where temperature is less than or equal to the critical temperature of water, water-soluble liquid, or a mixture of water and water-soluble liquid (Hereinafter, “water, water-soluble liquid, or mixture of water and water-soluble liquid” is referred to as “aqueous liquid”) and pressure is greater than or equal to the saturated vapor pressure of the aqueous liquid when the object is being immersed in the aqueous liquid to such a degree that the object is covered or to a greater degree and then releasing the pressure, a step of placing the object under pressure and abruptly releasing the pressure when the object is being immersed in the aqueous liquid to such a degree that the object is covered or to a greater degree, and a step of carrying out a heating process on the aqueous liquid and the object in a state where temperature is less than or equal to the critical temperature of the aqueous liquid and pressure is greater than or equal to the saturated vapor pressure of the aqueous liquid when the object is being immersed in the aqueous liquid to such a degree that the object is covered or to a greater degree and then abruptly releasing the pressure;
and
a separation step of separating, after the heating/pressurizing/pressure release step, the mixture of the object and the aqueous liquid into liquid and solid.

1 more element

A processing device for reducing a radioactive material of an object containing the radioactive material to a safe level in a living environment, comprising:

a heating processing device includes a container in which the heating process is carried out, a heating heater which heats the container, an inlet hopper through which an aqueous liquid and the object being at least one selected from the group consisting of an organism, a sewage sludge, a soil and an incineration ash, are put into the container, and a valve being located between the inlet hopper and the container;
a pressure relief device that communicates with the container and has a space that enables the pressure to be released;
a valve being opened or closed between the pressure relief device and the container;
a separation device that separates the mixture of the object and the aqueous liquid into liquid and solid;
the container being hermetic sealed with closing the valve being located between the inlet hopper and the container, and closing the valve being opened or closed between the pressure relief device and the container, and heating the object and the aqueous liquid in a state where temperature is less than or equal to the critical temperature of the aqueous liquid and pressure is greater than or equal to the saturated vapor pressure of the aqueous liquid when the object is covered or to a greater degree.

2 more elements

Dependencies are inferred from the claim text.