In situ characterization of a small sized motor under neutron irradiation

In order to conduct the integrated irradiation experiment of fusion blanket with testing reactor, it is indispensable to develop a small motor with high radiation resistance as the irradiation device. Therefore, the small motor was irradiated at the Japan Materials Testing Reactor. From this result of the irradiation test of a small motor, it became clear that the small motor was rotating normally up to the gamma-ray dose of 3.1×107 Gy, the fast neutron fluence of 2.8×1020 n/m2 and the thermal neutron fluence of 5.2×1021 n/m2 at 50 °C. The conductor resistance and the insulation resistance of polyimide coated wire, which did not change until the total gamma-ray dose of 3.1×108 Gy, the fast neutron fluence of 2.8×1021 n/m2 and the thermal neutron fluence of 5.2×1022 n/m2 at 50 °C, were 12 Ω and 1×108 Ω, respectively.