ES&S provided quality assurance consulting, materials testing, and construction observation for a series of projects at the Callaway Energy Center (CEC), related to the Independent Spent Fuel Storage Installation (ISFSI), which provides underground, dry, used-fuel storage for the 1,284-MWe pressurized water nuclear reactor that has been in operation since 1984.  The September 2015 installation of the first multi-purpose canister (MPC) placed in the HI-STORM UMAX marked the nuclear industry’s first installation of a “subterranean canister storage system” for spent fuel, and represents a technology first inspired in the aftermath of 9/11.  HI-STORM UMAX system is proprietary to The HI-STORM UMAX (Holtec International Storage Module Underground MAXimum Capacity) is an underground Vertical Ventilated Module (VVM) dry spent fuel storage system engineered to be fully compatible with all presently certified MPCs.

The project included the following facilities: HI-STORM UMAX (subterranean storage cavity); Haul Path (heavy-duty concrete pavement); Fuel Building to UMAX; Flex Building (precast storage facility); Security Fence; and a 5-MG Hardened Condensate Storage Tank

ES&S provided materials testing and construction observation for the placement of over 10,000 cubic yards of concrete (Controlled Low Strength Material CLSM) to fill the space surrounding 48 Cavity Enclosure Containers (CEC) for the entire 17-foot height of the CECs.  A typical pour day would

Another task involved consultations and confirmation of mix design calculations to create the high-strength, high-density concrete required by Nuclear Regulatory Commission (NRC) guidance for the other concrete work.  ES&S worked closely with the concrete supplier to source a locally available materials that would meet the project specifications.

ES&S performed work both for the Construction Manager, Holtec International, and directly for CEC

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