ROGERIO JEREZ
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Artigo IPEN-doc 28233 Initial criticality of the new core with plate-type fuel elements of the nuclear reactor IPEN/MB-012021 - BITELLI, ULYSSES D.; LANDIM, HUGO R.; JEREZ, R.; GILIOLI, REGINALDO; BOCARDO, LUIS A.; SABÓ, MARCO A.Artigo IPEN-doc 27614 Main experiments performed at the IPEN/MB-01 RR using UO2 fuel rods core2020 - BITELLI, U.D.; COELHO, P.R.P.; FERREIRA, P.S.B.; ALVES, M.A.P.; SILVA, A.A.; SANTOS, A.; DINIZ, R.; JEREZ, R.; FUGA, R.; FANARO, L.C.C.B.; KURAMOTO, R.; ABE, A.; LAMBIASI, B.; GIADA, M.; FER, N.; MARTINS, F.; MURA, L.; SANTOS, D.F.; AREDES, V.; MAEDA, R.; GONNELI, E.; SILVA, A.F.P.; PURGATO, R.; GONÇALVES, L.B.; SILVA, G.S.A.; PINTO, L.; SOUZA, G.This paper aims to show the main experimental utilization of the IPEN/MB-01 zero power reactor during the last 30 years with 3663 operations cycles. The IPEN/MB-01 reactor it was mainly used to validation of calculation methodology used in nuclear reactor cores design.Relatório IPEN-doc 25594 Testes de partida do reator Angra 1 – Parada 1P242018 - SHORTO, JULIAN M.B.; OLIVEIRA, OTAVIO L. de; FRANÇA, RENATO L.; JEREZ, ROGERIOEste relatório tem por objetivo apresentar os resultados obtidos durante a realização dos TFPZ – Testes Físicos à Potência Zero da Parada 1P24. Os dados foram adquiridos com o sistema de aquisição de dados da Usina ANGRA I (SICA), assim como com o Reatímetro do IPEN.Relatório IPEN-doc 24278 Testes de partida do reator Angra 1 – Parada P232017 - LANDIM, HUGO R.; SHORTO, JULIAN M.B.; OLIVEIRA, OTÁVIO L. de; FRANÇA, RENATO L.; JEREZ, ROGÉRIOEste relatório tem por objetivo apresentar os resultados obtidos durante a realização dos TFPZ – Testes Físicos à Potência Zero da Parada 1P23. Os dados foram adquiridos com o sistema de aquisição de dados da usina ANGRA I (SICA), assim como com o Reatímetro do IPEN.Relatório IPEN-doc 23415 Questionário Técnico - Salvaguarda de Materiais Nucleares2017 - SHORTO, JULIAN M.B.; OLIVEIRA, OTAVIO L. de; JEREZ, ROGERIOEste documento registra o relatório técnico produzido e entregue para o Serviço de Salvaguarda do IPEN, em 14/08/2017. Este relatório técnico tem como objetivo obter a licença junto à CNEN para a entrada de material nuclear enriquecido a 19,75% nas instalações do reator nuclear IPEN/MB-01. O Questionário Técnico propriamente dito encontra-se no Anexo 1 deste documento. Todos os documentos referentes às atividades relacionadas a este trabalho estão salvos no Pydio, serviço de armazenamento em Nuvem do IPEN, sendo que os usuários asantos, jmshorto, otavioluis, rjerez, e ubitelli tem acesso aos mesmos.Artigo IPEN-doc 23092 The experimental determination of the 238U(n,gamma) and total fission reaction rates along the pellet radius of the IPEN/MB-01 reactor2017 - MURA, LUIS F.L.; SANTOS, ADIMIR dos; DOMINGOS, DOUGLAS B.; ROSSI, PEDRO C.R.; JEREZ, ROGERIOThis work presents a new experimental approach to determine experimentally the reaction rate along the pellet radius of a research reactor facility. The methodology employs concentric hollow cylindrical lead collimators together with gamma-ray spectrometry in a special kind of HPGe detector for the discrimination of very low gamma energy emitted by Np-239 and Mo-99. The U-238 neutron capture and total fission rates were inferred, respectively, from the 106.2 keV gamma emitted by Np-239 and from the 140.51 keV gamma-ray emitted by Mo-99. These lower gamma-ray energies allow the thickness of the lead collimator to be small enough so that the correction factors applied to the procedure were minimized. This kind somewhat challenging experiment was successfully performed at the IPEN/MB-01 research reactor facility. The experiments are claimed to be well-defined, and they are suitable for a benchmark. The measured values of the total fission rates are mainly due to the thermal fissions in U-235 since in the IPEN/MB-01 reactor nearly 85% of the total fissions occur in the thermal neutron energy region. The theoretical analyses were performed using MCNP-5 together with the ENDF/B-VII.o library. The analyses reveal a very good agreement between the calculated and experimental results for the U-238 epithermal neutron capture reaction rates. However, the same can not be said for the thermal reaction rates which show discrepancies both in magnitude as well as in the shape of the attenuation of the reaction rates inside of the fuel pellet. The suspected reason for these discrepancies is the shape of the U-235 cross sections below 0.3 eV which might be different from that adopted in the ENDF/B-VII.o library. (C) 2016 Elsevier Ltd. All rights reserved.Artigo IPEN-doc 22567 A simple way to overcome the shortage of sup(3)He detectors in the IPEN/MB-01 nuclear reactor2016 - GONNELLI, E.; PINTO, L.N.; LANDIM, H.R.; DINIZ, R.; JEREZ, R.; SANTOS, A. dosIn order to overcome the shortage of 3He detectors for subcritical experiments in the IPEN/MB-01 reactor, some experiments were performed employing less sensitive detectors, such as BF3, and a logic input module, which sums the counts from different detectors. Through microscopic and macroscopic neutron noise technique, it was possible to obtain, respectively, Rossi-α distribution and Auto Power Spectral Densities (APSD) for each detector configuration and various subcritical levels, and the prompt neutron decay constant (α) was extracted through a least squares procedure. In addition, Cross Power Spectral Densities (CPSD) were acquired for different types of detectors and the correlation among those detectors was confirmed. It was also observed that there was no loss of correlation among the neutron pulses, and therefore, the CPSD curves demonstrated the presence of correlated events. The α parameter was used as an indicator for the comparison of the results and for the quality of the experimental data. The obtained values demonstrate that the sum of counts technique does not present loss of information (correlated neutrons) even for different models and types of detectors, suggesting that the technique may be employed in neutron noise measurements for subcritical reactivity.Artigo IPEN-doc 22481 A simple way to overcome the shortage of sup(3)He detectors in the IPEN/MB-01 nuclear reactor2015 - GONNELLI, E.; DINIZ, R.; SANTOS, A. dos; JEREZ, R.; PINTO, L.N.; LANDIM, H.R.Artigo IPEN-doc 22308 Three heavy reflector experiments in the IPEN/MB-01 Reactor: stainless steel, carbon steel and nickel2014 - SANTOS, A. dos; ANDRADE e SILVA, G.S.; MURA, L.F.; FUGA, R.; JEREZ, R.; MENDONCA, A.G.Artigo IPEN-doc 21713 An alternative experimental approach for subcritical configurations of the IPEN/MB-01 nuclear reactor2014 - GONNELLI, E.; LEE, S.M.; PINTO, L.N.; LANDIM, H.R.; DINIZ, R.; JEREZ, R.; SANTOS, A. dos