The SNF (spent nuclear fuel) of the reactors RBMK should be reprocessed after the construction of the plant RT-2 (Krasnoyarsk) will be finished, in accordance with the strategy of the closed nuclear fuel cycle and the concept of the SNF handling in Russia. Until that time (≈ year 2020) spent fuel assemblies (SFA) of RBMK-1000 reactors will be stored.

Currently there is huge amount of the spent nuclear fuel at the NPP with RBMK-1000 reactors (more then 70000 SFA). Taking into consideration the fact that every year approximately 450 SFA are being unloaded from an RBMK power unit (approximately 5000 SFA from all RBMK-1000 units in Russia), the capacity of the RBMK storage will be full on an average in 6 years and by 2002 at the LNPP. The duration of wet storage is now 25 years.

The nearest prospect for the RBMK fuel is the dry storage in a dual-purpose (storage/transportation) metal-concrete cask MCC /1/. In this paper we consider the variant of the container TUK-104 for 114 halves of RBMK-1000 fuel assemblies. The storage environment — argon, the time of cooling at least 10 years, the residual heat release of each half of a fuel assembly — 0.04 KW. The main attention is being paid to the cladding RBMK-1000 integrity during the storage, as the first barrier between radioactive fission products and environment.

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