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Getting back to yes: A local perspective on decommissioning, restart, and responsibility
For 45 years, Duane Arnold Energy Center operated in Linn County, Ia., near the town of Palo and just northwest of Cedar Rapids. The facility, owned by NextEra Energy, was the only nuclear power plant in the state.
In August 2020, a historic derecho swept across eastern Iowa with winds approaching 140 miles per hour. Damage to the plant’s cooling towers accelerated a shutdown that had already been planned, and the facility entered decommissioning soon after, with its fuel removed in October of that year. Iowa’s only nuclear plant had gone off line.
Today the national energy landscape looks very different than it did just six short years ago. Electricity demand is rising rapidly as data centers, artificial intelligence infrastructure, advanced manufacturing, and electrification expand across the country. Reliable, carbon-free baseload power has become increasingly valuable. In that context, Linn County has approved the rezoning necessary to support the recommissioning and restart of Duane Arnold and is actively supporting NextEra’s efforts to secure the remaining state and federal approvals.
Scott Briggs (York Univ), Jennifer McKelvie (Canadian Inst for Advanced Research), Magdalena Krol (York Univ)
Proceedings | 16th International High-Level Radioactive Waste Management Conference (IHLRWM 2017) | Charlotte, NC, April 9-13, 2017 | Pages 317-321
The long-term storage of nuclear waste is an engineering challenge being investigated around the world. The Canadian deep geological repository (DGR) design consists of a multiple barrier system including a used fuel container (UFC) surrounded by bentonite within a low permeability host rock. The bentonite buffer that surrounds the UFC is designed to limit the ingress of chemical species towards the UFC and minimize egress of radionuclides away from the UFC. In addition, the UFC consists of an inner steel container that resists the expected pressures at 500-800 m below the ground surface and is coated in copper which acts as a barrier against corrosion. Sulphide that is remotely produced by sulphate reducing bacteria far away from the UFC, can diffuse through the bentonite buffer and result in UFC corrosion. Modelling the transport of sulphide is therefore critical to determining the expected corrosion on the surface of the UFC. Accordingly, a three dimensional (3D) finite element model of the Canadian DGR was developed with emphasis on capturing the unique 3D UFC geometry and expected repository layout. The numerical model was implemented using COMSOL Multiphysics, and sulphide diffusion through the buffer was simulated using Fick’s Law incorporating a temperature dependent diffusion coefficient. The temperature in the DGR is expected to peak close to 100°C in the first 100 years due to the thermal radiation of heat from the used nuclear fuel. The results show an interesting variation of sulphide transport throughout the DGR indicating the benefits of 3D modelling. In addition, diffusion coefficients increase by a factor of 4 compared to background levels with temperatures near 100°C and lead to a sulphide flux increase in the DGR. The model includes diffusion coefficients that change spatially and temporally to fully capture the effect on sulphide flux.
