A NEW MEDIUM SIZE PACKAGING FOR LWR FUEL: THE TN 9/4

For its long term needs of spent fuel transports, BKW-FMB Energy Ltd. (BKW), the operator of the Swiss nuclear plant of Mühleberg has concluded an arrangement with Transnucléaire which includes the development of a new medium size packaging for high burnup LWR fuel: the TN 9/4. Mainly devoted to transports between Mühleberg NPP and the centralized Zwilag interim storage facility, the TN 9/4 packaging is however compatible with the reprocessing plants of Sellafield and La Hague. Transnucléaire, has developed this new TN 9/4 concept which is compatible with IAEA standard TSR-1. The paper will present this new cask, the design approach in accordance with the IAEA requirements and the test program performed.