Proposal of a vertical low temperature irradiation facility at the remodeled KUR

In the Research Reactor Institute, Kyoto University, the committee on making future plan was organized in June, 1989, and the subcommittee on examination of remodeling of KUR presented the first report of the examination on the remodeling of KUR on July 26, 1990. In the examination, the remodeling of the KUR is the premise, and the appropriate power output was set at about 5 MW. The new core tank is inserted in the existing reactor body, and high performance is aimed at by renewing the core part. In the report, the very low temperature irradiation facility is regarded as one of important experimental facilities in the remodeling plan. By installing a vertical, very low temperature irradiation facility in the hard spectrum field at the periphery of the core, the amount of fast neutron irradiation can be increased by about two figures as compared with the horizontal low temperature irradiation in the present KUR. The plan of the vertical, very low temperature irradiation facility was already reported. By giving sufficient cooling capacity, the irradiation at about 4K is feasible. (K.I.)