Orano TN has completed the first transfer and storage of used fuel canisters with a higher than usual heat load EOS canister in process of down-ending onto the horizontal transfer trailer for movement and loading at the onsite dry storage facility. Source: OranoEOS canister in process of down-ending onto the horizontal transfer trailer for movement and loading at the onsite dry storage facility. Source: Oranousing its Extended Optimized Storage (EOS) dry storage system. The use of EOS, which is licensed by the U.S. Nuclear Regulatory Commission for heat loads of up to 50 kW per canister, means used fuel can be transferred to secure dry storage after a shorter period of time.

Used nuclear reactor fuel is transferred to a pool where it is allowed to cool sufficiently, typically for a five-year period, before placement into dry storage or being reprocessed. The average heat load, an indicator of used fuel's decay heat, is 44.75 kW per EOS canister of 44.75 kW, well above the normal industry range of 14 kW to 34 kW per canister.

The transfer of 296 used nuclear fuel assemblies from the wet storage pool at a U.S. reactor to the onsite dry storage Independent Spent Fuel Storage Facility used eight EOS 37PTH canisters to securely store the used fuel in eight NUHOMS EOS Horizontal Storage Modules. Being able to transfer hotter fuel assemblies and fuel cooled for less time from wet to dry storage benefits operating nuclear facilities by simplifying the management of the pools and continuously reducing the wet-stored inventory of high heat and short-cooled fuel assemblies.

Each canister can store 37 high burnup pressurized water reactor fuel assemblies with the highest total heat load per canister available. The EOS units are also designed to provide maximum physical protection from external events and lowest radiation dose, with nearly half the dose rate of a vertical module system.

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