GNS Gesellschaft für Nuklear-Service mbH and Synatom, a subsidiary of the Belgian ENGIE Electrabel, have signed a contract for the development, licensing, and manufacturing of 30 transport and storage casks of the type CASTOR® geo24B and CASTOR® geo21B. 

The Interim Storage with its equipment was specially developed, ready-for-use designed and built for Ignalina Nuclear Power Plant (NPP) by a consortium consisting of NUKEM Technologies GmbH and GNS Gesellschaft für Nuklear-Service mbH. The project is financed with funds of international decommissioning foundation, which is governed by EBRD.

On 20 September 2016, the Nuclear Safety Inspectorate of Lithuania (VATESI) granted an operating license for the interim storage facility for spent fuel (ISFSF) at the Ignalina Nuclear Power Plant. The interim storage facility, including equipment components and CONSTOR® RBMK 1500/M2 casks, was designed and constructed on a turn-key basis specially for the Ignalina Nuclear Power Plant by a consortium consisting of GNS Gesellschaft für Nuklear-Service mbH and NUKEM Technologies GmbH.