RENATO YOICHI RIBEIRO KURAMOTO

RENATO YOICHI RIBEIRO KURAMOTO

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Calibration of the nuclear power channels of the IPEN/MB01 reactor: meassurements of the spatial neutron flux distribution in the core using infinitely dilute gold foils
2007 - BITELLI, ULYSSES D.; GONCALVES, LUCAS B.; KURAMOTO, RENATO Y.R.
Absolute measurement of betasub(eff) based on feynman-alfa experiments and the two-region model in the IPEN/MB-01 research reactor
2007 - KURAMOTO, RENATO Y.R.; SANTOS, ADIMIR; JEREZ, ROGERIO; DINIZ, RICARDO
Kinetic parameters determination through power sectral densities measurements using pulse-type detectors in the IPEN/MB-01 research reactor
2007 - KURAMOTO, RENATO Y.R.; SANTOS, ADIMIR dos; JEREZ, ROGERIO; DINIZ, RICARDO
Nowadays, a collaborative effort to improve the prediction accuracy of some kinetic parameters has been recommended. In special, a target accuracy of ±3% (1 s.d.) was requested for βeff calculations, in way that βeff values must be measured with an experimental error of less than 3%. In such a way, the Reactor Physics Group at IPEN/MB-01 Research Reactor has been compiled an experimental data bank of kinetic parameters, including βeff, Λ, βeff/Λ and others, based on noise analyses techniques. The implemented techniques are: Power Spectral Densities (PSD) using current-type detectors, Rossi-α and Feynman-α techniques. All these techniques provided βeff values with uncertainties within the target accuracy. In order to conclude this data bank, in this work we have been performed PSD measurements using pulse-type detectors. The main advantage of this technique is that it is possible to eliminate some electronic modules, needed in the current-mode experiments, which are sources of parasitic noises. Furthermore, this technique can explain an anomalous behavior reported in current-mode measurements, which is a non-observation of a theoretical predicted plateau above 200Hz, approximately. Once completed, the kinetic parameters data bank should provide valuable information to determine whether or not the currently data libraries are sufficiently accurate to predict these measured parameters. Further, we intend to submit a proposal for the first international benchmark related to βeff measurements, to the International Reactor Physics Experiment Evaluation Project (IRPhEP, NEA data bank).
Determinacao experimental da constante de decaimento de neutrons prontos do reator IPEN/MB-01 via o metodo Rossi-alfa
2005 - KURAMOTO, R.; SANTOS, A.; JEREZ, R.; BITELLI, U.D.; DINIZ, R.; MADI FILHO, T.; SANTOS, S.C.
Absolute measurement of βeff based on Rossi-α experiments and the two-region model in the IPEN/MB-01 research reactor
2008 - KURAMOTO, RENATO Y.R.; SANTOS, ADIMIR dos; JEREZ, ROGERIO; DINIZ, RICARDO
A new method for absolute measurement of the effective delayed neutron fraction βeff based on Rossi-α experiments and the two-region model was developed at the IPEN/MB-01 Research Reactor facility. In contrast with other techniques such as the slope method, the Nelson-number method, and the 252Cf-source method, the main advantage of this new methodology is to obtain the effective delayed neutron parameters in a purely experimental way, eliminating all parameters that are difficult to measure or calculate. In this way, Rossi-a experiments for validation of this method were performed at the IPEN/MB-01 facility, and with the use of the present approach, βeff was measured with a 1.46% uncertainty. In addition, the prompt neutron generation time A and other parameters were also obtained in an absolute experimental way. In general, the final results agree well with values from frequency analysis experiments. Comparison of theory and experiment reveals that JENDL-3.3 shows deviation for βeff lower than 1%, which meets the desired accuracy for the theoretical determination of this parameter. This work supports the reduction of the 235U thermal yield, as proposed by Okajima and Sakurai.