DEVELOPMENT OF BORATED ALUMINUM MATERIAL FOR BASKET OF TRANSPORT/STORAGE CASKS

Enriched borated aluminum alloys suitable for application to baskets in transport and storage casks for high burn-up spent fuels have been developed. This borated aluminum alloy is 1mass%B-A6061-T6 and various design basis properties required for cask basket has been prepared. The various properties such as neutron absorption, thermal conductivity, mechanical property and fracture toughness were taken into consideration to develop the borated aluminum alloy. And the allowable stresses of 1mass%B-A6061-T6 have been evaluated according to the draft of “Rules on Transport / Storage Packagings for Spent Nuclear Fuel” being now prepared by the Japanese Society of Mechanical Engineers.