Photographic monitoring system for observing heavy free-falling objects: Multi-stage design packages of radioactive waste |
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| Authors: | Akihiko Ito Koki Ouchi Isamu Hisa Susumu Seki Yoshio Seto Shoji Kurashina |
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| Institution: | (1) Division of Environmental Safety Research, Tokai Research Establishment, Japan Atomic Energy Research Institute, Tokai-mura, 319-11 Ibaraki, Japan;(2) Hydrographic Department, Maritime Safety Agency, Tsukiji, Chuo-ku, 104 Tokyo, Japan |
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| Abstract: | In the consideration of safety it is required that packages containing radioactive wastes when dumped at sea should keep their
integrity and retain their contents until they reach the seabed. Packages containing simulated radioactive wastes (non-radioactive)
were tested by a free-fall method at depthsca. 4,300 m in an area for dumping industrial waste off Shikoku Island. Since the weight of the largest package was 4,300 kg,
special attention was paid to the connection of a buoyancy system with mooring rope. Descent and ascent velocities of the
free-fall system were calculated prior to the experiment. A free-fall experiment with an extremely heavy object, heavier than
ever previously reported, was accomplished without trouble by using the free-fall system. Recovery of a camera, flash-light,
and other components was successful in each of the three experiments. Successive photographing of the package during descent
was made and its integrity was observed using the photographs taken by the recovered camera. The packages remained intact
during descent and at least for a short time after arrival on the seabed. |
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