輸送貯蔵キャスク用バスケット材1%B-A6061-T6/T651及びA6061-T6/T651の機械的特性

概要

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Basket material of transport and storage cask is required to have not only a structural strength during transport and storage conditions, neutron absorbing function but also heat removal function. The basket material is also preferable to be light in order to reduce the weight of cask because it is very important to improve the efficiency of transport and storage by increasing the number of fuel assemblies loaded in cask. Aluminum alloy is suitable base material for basket due to its low density and high thermal conductivity. Enriched borated aluminum alloys have been developed, suitable for application to baskets in transport and storage casks for spent fuels. This borated aluminum alloy is 1% borated in A6061-T6/T651 alloy. In order to use this material for cask basket, it is necessary to be registered to the "Rules on Transport/Storage Packagings for Spent Nuclear Fuel (JSME S FA1-2007)" by the Japanese Society of Mechanical Engineers. Therefore, various mechanical properties such as tensile strength at elevated temperature with or without long term aging, creep properties and fracture toughness, etc.. And the allowable stresses of 1%B-A6061-T6/T651 have been evaluated according to the "Rules on Transport/Storage Packagings for Spent Nuclear Fuel (JSME S FA1-2007)".
2010-11-25