To support decommissioning of the Vermont Yankee Nuclear Plant (VY), Entergy Nuclear signed a contract with Holtec to defuel the VY spent fuel pool. The overall project scope included construction of a second Independent Spent Fuel Storage Installation (ISFSI) pad, security expansion, engineering, licensing, manufacturing, delivery and loading of 45 HI-STORM cask systems, all on a turnkey basis.
In just over 3 ½ years from plant shut down, VY’s spent fuel pool was completely defueled (i.e., no spent fuel assemblies remain in the pool) setting a new industry benchmark. A total of 2,996 spent fuel assemblies were loaded into the dry storage canisters. The final ISFSI pad now contains a total of 58 HI-STORM dry cask storage systems; 13 systems were loaded by VY while the plant was still operating and the remaining 45 casks were loaded after the plant shutdown.
Use of Holtec’s patented MPC-68M canister technology, featuring the Metamic-HTTM fuel basket, allowed for NRC approval of loading spent fuel with as little as two years cooling time into dry storage canisters. Safe and early defueling of the spent fuel pool paved the way for decommissioning of the VY plant.