Dismantling method of fuel cycle facilities obtained by dismantling of the JRTF

Kanayama, Fumihiko 

With the development of researches and investigations for atomic energy in Japan, various nuclear institutes have been built since 1960s. Today, large numbers of nuclear institutes became old and should be dismantled near future. Necessities for dismantling technology for atomic institutes became large. To dismantle atomic institutes, many cost and time are required. By choosing appropriate method, the cost and time for dismantling can be decreased. To choose appropriate method, it is important to collect the dismantling data of each kind of method, and understand advantages and disadvantages of each dismantling method accurately. To plan the nuclear facility which can be dismantled easily, and to promote setting up and dismantling efficiently, it is important to understand advantages and disadvantages of each dismantling method accurately, too. In JAEA, JPDR was dismantled to get experience of dismantling method of nuclear reactor. But, JAEA did not have experience of fuel cycle facility. Dismantling cost of fuel cycle facilities are more than that of nuclear facilities due to the contamination by TRU nuclide in fuel cycle facilities, In this report, to find appropriate method for dismantling fuel cycle facility, we dismantled liquid waste storage tank and wall-penetrating pipings in JRTF, which was one of the reprocessing facilities in JAEA. Number of man-days and occupational dose required were estimated to reveal advantages and disadvantages of two dismantling methods in each component. Moreover, appropriate conditions to select these dismantling methods are introduced.