METHOD AND DEVICE FOR RE-COVERING AND DEFECTION OF IRRADIATED HEAT-FUEL ASSEMBLIES LOCATED IN DEFECTIVE CASES

摘要

1. A method of re-covering and flaw detection of irradiated fuel assemblies (SFAs) located in defective casings located in the cells of a dry storage, in which the plug is removed from the casing, then, using a guiding device and a grip on the channel container, the spent fuel assemblies in the casing are pulled out in turn and through the guiding device they are loaded into a conditioned cover, characterized in that a working zone for re-covering and defect detection of spent fuel assemblies is formed in the storage facility, containing four adjacent technological cells in the storage floor, equipped with guide funnels installed on retractable supports, with the help of which they provide a vertical arrangement of the loaded into the cells of the canisters, the defective cover is transferred with the help of the cover container from the storage cell and lowered through the guiding funnel into the first technological cell, after which they begin to re-cover the spent fuel assemblies in this cover, for which the lifting device of the channel container is created in a controlled manner f the force of its pulling, while the SFA, stretched with a force less than 80 kgf, is loaded through a guiding device into a standard case located in the second technological cell, the SFA, stretched with an effort within 80 ÷ 120 kgf, is loaded through a guiding device into a reinforced case placed in the third technological cell, and if the generated force exceeds 120 kgf, then such spent fuel assemblies are left in a defective canister and overloaded with a canister container through a guide funnel into the fourth cell equipped with a thin-walled sealed canister. ! 2. The method according to claim 1, characterized in that, if necessary,