Conceptional study of remodeling of the heavy water facility of the Kyoto University reactor

The heavy water facility of the Kyoto University reactor is required to be remodelled in order to improve the safety of the whole facility. The main objectives of the remodeling are: 1) easy maintenance, 2) no leakage of heavy water or light water for cooling of the heavy water tank, and 3) to enable medical irradiation during continuous operation of the reactor. Improvement of the performance as a thermal neutron irradiation field is also intended. The outline of the present heavy water thermal neutron facility is described, and conceptional study of the remodeling is presented. A shutter system enabling the use during continuous operation is mentioned. The method and procedure of the remodeling is examined and outlined. (T.H.)