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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.
H. T. Hahn, E. M. Vander Wall
Nuclear Science and Engineering | Volume 17 | Number 4 | December 1963 | Pages 613-619
Technical Paper | doi.org/10.13182/NSE63-A18453
Articles are hosted by Taylor and Francis Online.
The behavior was studied of dibutyl phosphoric acid (HDBP) and its complexes in the uranium stripping and tributyl phosphate (TBP) scrubbing operations. The solubilizing effect of TBP upon UO2(DBP)2 is shown. At low concentrations of nitric acid and TBP, UO2(DBP)2 has greater solubility in the aqueous phase. For enriched uranium stripping conditions, the solubility ratio is almost unity, and DBP may partially accompany uranium through the stripping step. The partition of uranium between TBP-Amsco and dilute nitric acid solutions is shown as a function of both HDBP and TBP concentrations. In the region of interest, uranium appears to be extracted as a complex with DBP/U ratio of one. As the DBP/U ratio increases from one to two, solid UO2(DBP)2 appears. Above a ratio of two, and in the presence of TBP, no solids remained after equilibration, indicating additional DBP-TBP complex formation. For the succeeding TBP scrubbing operation, the TBP distribution coefficient between Amsco and aqueous phase is 290. However, pilot plant experiments were unsuccessful in scrubbing to the desired phosphate level due to two effects. Laboratory studies indicated an equilibration time of two minutes, considerably longer than permitted in the pilot plant tests. The presence of an aqueous-favoring phosphorus species was also established. The latter can be removed by absorption on a hydrated zirconium oxide column and the column regenerated with NaOH. The absorption behavior of HDBP and a plant evaporator phosphate contaminant are compared.
