LUIS FELIPE LIMBOS MURA
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Artigo IPEN-doc 26343 IPEN/MB-01 reactor experiments with nickel reflectors2019 - SILVA, GRACIETE S. de A. e; MURA, LUIS F.L.; FUGA, RINALDO; SANTOS, ADIMIR dosIn the validation and verification processes of calculation methodologies and associated nuclear data libraries, the existence of experiments that can be considered benchmarks is of fundamental importance. For this purpose, a set of experiments with heavy material nuclear reflector was performed in the IPEN/MB-01 reactor using nickel plates properly inserted in the west face of the reactor core. A total of 32 plates around 3 mm thick were used in the experiment. The axial width and length were sufficient to cover the entire active reactor core. For each plate placement step, reactivity measurements were made due to their insertion in the core; as well as of the critical position of the equally removed BC1 and BC2 control rods. It could be observed that the increase of neutron absorption and consequent decrease of neutron moderation dominated the whole physics of the problem when few plates of reflective material were inserted (about 3 plates). Thereafter, neutron reflection became important overcoming neutron absorption; the reactivity increased until it surpassed the situation without plate (excess reactivity zero) obtaining an increase (net gain) of reactivity with the 32 plates inserted (about 295 pcm). Therefore, it was observed that the reflected nucleus became more reactive than the nucleus without reflective material. The theoretical analysis using MCNP-5 and ENDF/B-VII.0 nuclear data library showed the physical aspects of neutron absorption and reflection in the heavy reflector considered; however, it presented a discrepancy when fast neutron reflection dominates the physical phenomenon of neutron transport. In order to verify the impact of other models of thermal scattering of hydrogen in water for the computational simulations of the experiments, three models were considered, besides the one used by the ENDF/B-VII.0 library: ENDF/B-VII.0 scattering law; new evaluation of the S (alpha, beta) for hydrogen bound in water performed in Bariloche Atomic Center, Argentina; and the calculated with new released evaluations for (235)U, (238)U and (16)O.Artigo IPEN-doc 19376 Heavy reflector experiments composed of carbon steel and nickel in the IPEN/MB-01 reactor2013 - SANTOS, ADIMIR dos; ANDRADE e SILVA, GRACIETE S. de; MURA, LUIS F.; FUGA, RINALDO; JEREZ, ROGERIO; MENDONCA, ARLINDO G.Artigo IPEN-doc 12173 Measurement and calculation of the rate of nuclear reaction of radioactive capture along of the radius of UOsub(2) fuel pellet at IPEN/MB-01 reactor2007 - BITELLI, ULYSSES D.; SANTOS, ADIMIR; MURA, LUIS F.L.; FANARO, LEDA C.C.B.Artigo IPEN-doc 17093 Impact on geometric efficiency of HPGE detectors due to utilization of collimators on measures of radial distribution of nuclear reaction rates at IPEN/MB-01 reactor pellets2011 - MURA, LUIS F.L.; CARLUCCIO, THIAGO; NUNES, BEATRIZ; SANTOS, ADIMIR dos; BITELLI, ULYSSES D.Artigo IPEN-doc 17092 IPEN/MB-01 heavy reflector benchmark calculations using serpent code2011 - MURA, LUIS F.L.; CARLUCCIO, THIAGO; ROSSI, PEDRO C.R.; DOMINGOS, DOUGLAS B.; PIOVEZAN, PAMELA; ROSSI, LUBIANKA F.R.; SANTOS, ADIMIR dos