DEVELOPMENT OF EXPERIMENTAL RIGS FOR TEMPERATURE-CONTROLLED REACTOR IRRADIATIONS FOR FUNDAMENTAL-STUDY OF RADIATION EFFECTS ON FUSION MATERIALS

The accumulated results of radiation effects on materials have clearly shown that temperature history is very important for the evolution of microstructures induced by irradiation. The Japan Materials Testing R eactor has several preferable features for temperature-controlled irra diation. Two kinds of techniques were applied to control the irradiati on temperature. The control of thermal insulation along with heating b y the electrical heater, which is the other technique of the temperatu re control, permits us to control the temperature in the range of 360- 1100 K, regardless of whether the reactor is in the operation or out o f operation.