Development of NFT Type Spent Fuel Transport Cask

AbstractNFf type casks have been developed to transport spent fuel from domestic nuclear power plants to the reprocessing plant which is under construction in Rokkasho-mura, Aomori Prefecture. The spent fuel to be transported is greater in burn up and enrichment than that for the Tokai reprocessing plant and the annual shipment will be approximately ten times greater. Therefore, in developing the cask, greatest emphasis was placed on the enhancement of transport efficiency to reduce transport frequency. To maximise. the payload, the cask weight was made as close as possible to the maximum capacity of the crane available at the reactor site. Crane capacities of the nuclear power plants were grouped into six, and six kinds of cask were developed. The design of all types of NFf casks was approved in 1994 and 40 units of the cask are under construction to prepare for shipment.