[en] Automatic translation: 1 Introduction: During the interim storage of spent fuel elements from HTR nuclear power plants a storage time of at least 10 years is assumed. Appropriate concepts for warehouses are available; the favored concept, the is based on the use of transport / storage containers Establishment and operation of the corresponding storage facilities already implemented: for THTR fuel elements at the Ahaus site, for AVR fuel elements on the site the KFA. Laboratory experiments and technological demonstration experiments deliver the experimental data for an optimal storage design and for the support / further development of a release model for radioactive nuclides.