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A large amount of T is used as a fuel in a fusion reactor, but its release to the environment is rigidly regulated to be quite low by law. In order to protect workers , the public, and the environment from radiation of T, it is very important to confine T safely. The first section explains basics of radiation protection and indicates specified values relating to T safety confinement such as dose limit. T has a property of permeating easily through even metals. Therefore, the T release to the environment is suppressed by multiple confinements system based on the concept of defense in depth. The multiple-confinement system has been adopted in many T handling facilities in the world and operated successfully for many years. The second section explains the concept and practical configuration of the multiple confinements system in the present T handling facilities and a fusion power plant. In the fusion power plant, various kinds of wastes contaminated by T would be generated. It is necessary to pay careful attention in handling of these T contaminated wastes . The third section explains the management and processing of the T contaminated wastes. |
