複数個の輸送容器を積載した使用済核燃料輸送船内の放射線量率分布測定

概要

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Radiation dose rates were measured on board of the spent fuel shipping vessel HINOURA MARU loaded with two HZ-75 casks and one NH-25 cask. The spent fuels contained in these casks were BWR type. The burn up was about 19,700 MWD/MTU, and the cooling time was about 300 days.Thermoluminescence dosimeters, an ionization chamber, and a neutron rem-counter were used as the detectors, and 181 measuring points were selected in the holds and on the hatch covers.On the surface of the HZ-75 cask, the maximum gamma-ray dose rate was observed near the head, especially on the side surface. It is considered that gamma-rays from the activated cobalt-60 in the structure of a fuel assembly contribute to the dose rate. On the hatch cover, the gamma ray dose rates of the port side were higher than those of the starboard side. This indicates that the gamma rays in the port side were mainly due to the radiations from the heads of the casks which were placed toward the port side in the hold.
独立行政法人海上技術安全研究所の論文
1982-09-30