JOSE ANTONIO BATISTA DE SOUZA
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Artigo IPEN-doc 29863 Manufacturing high-uranium-loaded dispersion fuel plates in Brazil2024 - DURAZZO, MICHELANGELO; SOUZA, JOSE A.B.; CARVALHO, ELITA F.U. de; RESTIVO, THOMAZ A.G.; GENEZINI, FREDERICO A.; LEAL NETO, RICARDO M.The Nuclear and Energy Research Institute (IPEN-CNEN/SP) has developed and made available for routine production the technology for manufacturing dispersion-type fuel elements for research reactors. However, the fuel produced is limited to a uranium loading of 2.3 gU/cm3 (U3O8) or 3.0 gU/cm3 (U3Si2). To reduce Brazil’s dependence on foreign sources of Mo-99, the Brazilian government plans to construct a new research reactor, the 30 MW open pool Brazilian Multipurpose Reactor (RMB), which will mainly produce domestic Mo-99. Low-enriched uranium fuel will be used in the RMB, and increasing uranium loading will be important to increase the reactor core’s reactivity and fuel life. Uranium loadings of 3.2 gU/cm3 for the U3O8-Al and 4.8 gU/cm3 for the U3Si2-Al are considered the technological limit and have been well demonstrated worldwide. This work aimed to study the manufacturing process of these two highly uranium-loaded dispersion fuels and redefine current procedures. Additionally, UMo-Al dispersion fuel has been extensively studied globally and is likely to be the next commercially available technology. This new fuel utilizes a dispersion of UMo alloy with 7–10 wt% Mo, resulting in a uranium loading between 6 and 8 gU/cm3. We also studied this fuel type for potential use in the RMB research reactor. This work outlines the primary procedures for manufacturing these three types of fuels and the necessary adjustments to IPEN-CNEN/SP current technology. The manufacturing process proved to be well adapted to these new fuels, requiring only minor modifications. A comparison was made of the microstructures of fuel plate meat using three types of uranium compounds. The microstructures of U3Si2-Al and U10Mo-Al dispersions were found to be adequate, while that of U3O8-Al meat deviated significantly from the concept of an ideal dispersion.Artigo IPEN-doc 15857 Procedimentos de fabricação de elementos combustíveis a base de dispersões com alta concentração de urânio2010 - SOUZA, J.A.B. de; DURAZZO, M.O IPEN desenvolveu e disponibilizou para produção rotineira a tecnologia de fabricação de elementos combustíveis tipo dispersão, para uso em reatores nucleares de pesquisas. Contudo, o combustível fabricado no IPEN está limitado à concentração de urânio de 3,0 gU/cm3 , para dispersões a base de U3Si2-Al. O aumento da concentração de urânio nas placas combustíveis é interessante pela possibilidade de se aumentar a reatividade do núcleo do reator e a vida útil do combustível. É possível aumentar-se a concentração de urânio no combustível até o limite tecnológico de 4,8 gU/cm3 para a dispersão U3Si2-Al, a qual está bem qualificada ao redor do mundo. Esse novo combustível deverá ser utilizado no novo Reator Multipropósito Brasileiro–RMB. Este trabalho tem por objetivo desenvolver o processo de fabricação do combustível com alta concentração de urânio, redefinindo-se os procedimentos de fabricação atualmente adotados no IPEN. Estão descritos os ajustes de processo que deverão ser realizados.Artigo IPEN-doc 06349 First results of Usub(3) Sisub(2) production and its relevance in the power scale-up of IPEN research reactor IEA-R1m1997 - SALIBA SILVA, A.M.; SOUZA, J.A.B.; FRAJNDLICH, E.U.C.; PERROTTA, J.A.; DURAZZO, M.