The CONSTOR® casks are designed for the safe transport and storage of all kinds of spent fuel assemblies. The cask consists of a thick-walled cylindrical “sandwich” cask body, including an inner and an outer liner fabricated from fine-grained steel. Both liners are welded to the massive fine-grained steel head ring to form a double barrier containment.
For additional shielding the cavity between the liners is filled with CONSTORIT, a heavy concrete with special shielding characteristics, developed by GNS.
The lid system consists of three lids:
No need for active monitoring during the storage period (passive system).
The basket for accommodation of the spent fuel assemblies serves for criticality safety as well as for heat dissipation.
At the lid end of the cask body, one pair of trunnions is bolted for attachment of handling equipment.
The CONSTOR® casks are intended for the interim storage of spent fuel. In combination with shock absorbers and an overpack, the CONSTOR® casks design comply with the international regulations of the IAEA for type B(U) package designs.
More than 300 casks were manufactured for Bulgaria (CONSTOR® 440/84) and Lithuania (CONSTOR® RBMK-1500, CONSTOR® RBMK1500/M2). Thereof more than 250 casks have already been loaded.