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• W206805572 abstract "In case of disposing radioactive wastes into the sea the container has to reach the deep-sea floor safely and exactly and to remain in safe conditions without being destroyed for an extremely long time. In order to attain this purpose the container must remain at a depth of 2, 000 m, and accordingly it must withstand the hydraulic pressure and other oceanic conditions at this depth. For the purpose of acquiring basic data for determining the standard of economical and safe container we have carried out the investigations on form, strength, corrosion resistance, etc. of the container.Above all things a cylindrical container made of concrete and covered with thin metal plates may be considered to be suitable as economical and practical one for disposing radioactive wastes. Consequently in the present studies we constructed containers of cylindrical form like an oil drum, which have three different sizes and are made of mortar; we carried out collapse tests. Among the results of the tests the value of wall thickness / mean radius (t/r) against collapse pressure of these three kinds of containers are similar to each other. The value of t/r of the cylindrical con tainer corresponding to the critical collapse pressure of 200 kg/cm2 is 0.25. This shows that the cylindrical part of container will be able to be designed dependent only upon the value of t/r, if the size of the cylinder be not so extremely different from that of the body to be tested. From. the results of similar experiments on the end-plate of the container it became clear that the container will be able to withstand the hydraulic pressure of 200 kg/cm2, if the end-plate thickness/ inner diameter of the cylinder (t/d) be 0.26.Various kinds of metallic material may be considered to be suitable as metal used in the cover of the container, however, the steel plates of drums are not only economical in case of using large numbers at a time, but also now used as containers for disposing radioactive wastes.We constructed the apparatus capable of reproducing oceanic conditions such as temperature of sea water, dissolved oxygen and current velocity within the laboratory and using this apparatus we carried out the corrosion test of the steel plates of drum in an artificial sea water. From the test we obtained the result that the weight loss by corrosion during 168 days was about 15× 10-3 g/cm2 in conditions, where the temperature of the artificial sea water was 2°C, the dissolved oxygen was 2.65 ml/l and the current velocity was 1.5 cm/sec.It is found that not only the dissolved oxygen is a primary factor of the corrosion of steel plate in the artificial sea water, but also the current velocity will play an important role in the corrosion, even if it be very slow." @default.
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• W206805572 date "1963-01-01" @default.
• W206805572 modified "2023-10-04" @default.
• W206805572 title "Studies on the Container for Disposing Radioactive Wastes into the Sea-I" @default.
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• W206805572 doi "https://doi.org/10.5928/kaiyou1942.19.16" @default.
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