[en] This report examines the effects of prolonging the period of interim spent fuel storage (from 60 y to 100-200 y) in order to postpone (indefinitely?) disposal in the repository. The Swedish plant for interim storage, CLAB, is expected to have a lifetime of about 200 y. A prerequisite is that the quality of operation and maintenance remains at the present level, in order to keep the water chemistry and the environment in the storage area at the prevailing specifications. The need for repair and renovation of the buildings must be evaluated. Bolting and rock supports can not be certain to have a lifetime of 200 years, and must be replaced. Control- and electric equipment have limited lifetimes, and are continuously replaced, today already. The fuel elements and the stored radioactive reactor components, can, according to experts, be stored for more than 200 y if the water chemistry is correct. If CLAB is abandoned, and no water is led into the pools, the water will evaporate in one month, which can lead to fuel damages and emission of radioactive substances. After about 250 years, the residual heat has diminished to such a degree that the water can not evaporate completely