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- W2283379784 abstract "Two experiments performed at the IPEN/MB-01 reactor are suggested to serve as a benchmark problem to verify mainly the adequacy of the {sup 235}U nuclear data for criticality analyses and for the isothermal reactivity coefficient determination of thermal reactors. The experiments are claimed to be well-defined, and they are suitable for a benchmark problem partially due to their small uncertainties and partially due to the lack of any sort of calculated correction factors or any quantity that comes either from the calculational methodologies or from another experiment. The isothermal experiment fulfills a specific need to introduce a reactor response that is sensitive to the {sup 235}U cross-section shape below 5 meV. This feature could be accomplished due mainly to the very precise control bank system characteristics of the IPEN/MB-01 reactor. The MCNP-4B calculational analyses reveal that the most recent {sup 235}U evaluation (Leal-Derrien-Larson's evaluation) incorporated in ENDF/B-VI release 5 performs well in the theory-experiment result comparisons of the aforementioned experiments. Particularly in the isothermal experiment, ENDF/B-VI release 5 produces results that even considering the deviations inherent to the Monte Carlo method meet the desired accuracy ({+-}1.0 pcm/deg. C) for the isothermal reactivity coefficient determination in contrast to the JEF-2.2 andmore » JENDL-3.2 libraries, which produce unacceptably high k{sub eff} results. The main reasons are the {sup 235}U nuclear data in the case of JEF-2.2 and the nuclear data of both {sup 235}U and iron in the case of JENDL-3.2.« less" @default.
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- W2283379784 date "2001-01-01" @default.
- W2283379784 modified "2023-09-27" @default.
- W2283379784 title "A Proposal for Benchmarking235U Nuclear Data" @default.
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- W2283379784 doi "https://doi.org/10.13182/nse01-a2175" @default.
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