Abstract
Radiation shielding analyses were done for JT-60 Super Upgrade (JT-60SU) of JAERI in Japan, and are reported here. From a viewpoint of the operation and the maintenance, it is important how accurately to evaluate the nuclear heating rate in the superconducting magnet and the activation of components around the vacuum vessel by irradiation of fusion neutrons. A boot-strapped calculation step was applied to the analyses to reduce the redundancy of the conservative in the results. The nuclear heating rate in the superconducting magnets and the maximum γ-ray dose rate one month after shutdown in the cryostat were within the design limits of 2 mW/cc and 10 μSv/hr, respectively, in the nuclear shielding for a D-D neutron production rate of 1×1018 s−1.
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