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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The Evaluation of the Effective Kinetic Parameters and Reactivity of the IPEN/MB-01 Reactor for the International Reactor Physics Experiment Evaluation Project

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Author(s):
dos Santos, Adimir [1] ; Diniz, Ricardo [1]
Total Authors: 2
Affiliation:
[1] Inst Pesquisas Energet & Nucl IPEN CNEN SP, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: NUCLEAR SCIENCE AND ENGINEERING; v. 178, n. 4, p. 459-478, DEC 2014.
Web of Science Citations: 3
Abstract

The evaluation of the experiments of the effective delayed neutron parameters and reactivity performed in the IPENI MB-01 research reactor facility has been successfully accomplished. The evaluated data are of very good quality and fulfill the requirements of a benchmark. The recently released MCNP6 together with the ENDFIB-VII.1, JENDL-4.0, JEFF-3.1.1, ENDF/B-VII.0, and JENDL-3.3 nuclear data libraries has been employed to calculate the effective delayed neutron parameters adopting the benchmark model of the IPENI MB-01 reactor available in the International Handbook of Reactor Physics Benchmark Experiments. The analysis reveals that all these nuclear data libraries produced satisfactory results for beta(eff), beta(vertical bar Lambda)(eff) , and Lambda. The same cannot be said for determining the reactivity using the Inhour equation. It was shown that there is a clear tendency to increase the deviation with the absolute value of the reactivity for negative periods. Only JENDL-3.3 and JEFF-3.1.1 produced results that are inside the 3 sigma range of the benchmark value uncertainty. Specifically for the case of ENDF/B-VII.1, a good part of this discrepancy is due to the decay constant of the first group of delayed neutrons, which is overestimated according to the experimental value measured in the IPEN/MB-01 reactor. (AU)