Numerical prediction of the behavior of tritium accidentally released in fusion power plants

In the D-T fusion power plants, large amounts of tritium would be handled. Tritium is the radioisotope of protium, and is easily taken into the human body. Thus, the behavior of tritium accidentally released in the fusion power plants should be studied for the safety design and radioprotection of workers. The catalytic oxidation and adsorption is the most conventional and reliable method for removing tritium that is accidentally released into the working area of fusion power plants. Therefore, the author is developing a numerical calculation code to support the design of the air clean-up system used in the fusion power plants. It is being developed based on the hot and cold experimental database. In addition to this type of numerical calculation code, it is also necessary to develop a calculation code that predicts the tritium behavior released into large rooms, since complex flow fields should exist in such rooms and they could affect the ventilation of the air containing tritium released. Therefore, the author is developing a numerical computation code that predicts the tritium behavior in large rooms based on the flow field generated by the ventilation of air as well. With these numerical calculation codes, the behavior of tritium accidentally released into a large room was predicted. (author)