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Feasibility to Convert the NuScale SMR from UO₂ to a Mixed (U, Th)O₂ Core: A Parametric Study of Fuel Element—Seed-Blanket Concept

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World Journal of Nuclear Science and Technology 2023年第2期13卷 11-28页

作者： Giovani Laranjo de Stefani Diego Manoel Enedino Gonçalves cesar raitz Marcelo V. da Silva Caio Július César Miranda Rodrigues da Cunha Departamento de Engenharia Nuclear Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil Insituto de Engenharia Nuclear Rio de Janeiro Brasil Departamento de Energia Nuclear Universidade Federal de Pernambuco Recife Brazil

Delays in the construction of nuclear reactors due to licensing issues have been a problem across the world, affecting projects in Finland, France, and the United States. Small Modular Reactors (SMRs) emerge as a transition between Generations III+ and IV in order to make nuclear energy more competitive with other energy sources, including renewables. In this study, the SMR NuScale, one of the most promising projects today, is investigated for its conversion into a U-233-producing reactor through the Radkowsky seed-blanket fuel element concept, applied in the Shippingport reactor, in a parametric study. Initially, a validation of the reference reactor (NuScale) was carried out with data from technical documents and papers, thus demonstrating the agreement of the computational model carried out with the SERPENT code. Then, a parametric study is carried out to define the area of the seed and blanket region, proportions of enrichment and pitch length. Finally, a comparison is made between the production of U-233, TRU reduction, burn-up extension and neutronic and thermohydraulic safety parameters. This study demonstrates an improvement in the conversion factor and a considerable reduction in the production of TRU, in addition to the production of U-233 with a low proportion of other uranium isotopes that can lead to the beginning of the thorium cycle with already consolidated technologies.

关键词： Thorium SMR Seed-Blanket NuScale

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