We are pleased to announce that Southern California Edison (SCE) has awarded an Engineering, Procurement, Construction (EPC) contract to Holtec to place the used fuel inventory of the two retired San Onofre Nuclear Generating Station (SONGS) reactors into dry storage. Under the contract, Holtec will construct a HI-STORM UMAX underground storage facility to store 2,668 used fuel assemblies in the MPC-37 multi-purpose canister, each containing 37 used fuel assemblies. HI-STORM UMAX is an acronym for Underground and MAXimum Safety and Security. Holtec will also perform pool-to-pad loading services for all used fuel and non-fuel waste stored in the spent fuel pools of SONGS Unit 2 and 3. To insure a long service life in the site’s salt air environment, SCE has selected the most corrosion resistant grade of stainless steel, 316L grade austenitic stainless steel, for the confinement boundary of the MPC in lieu of the commonly used 304 grade. Likewise, all external surfaces of the storage cavity in contact with the ambient air will be upgraded from carbon steel to stainless steel to minimize in-service maintenance requirements. (more…)