235U Resonance Structure Effect on Computed Characteristics of Critical Assemblies in Large Physical Testing Facility with Softened Neutron Spectrum

An unusual change of the contributed reactivity of uranium samples with 90% enrichment depending on the size was observed during experiments on the critical assembly of the large physical testing facility with a softened neutron spectrum: the reactivity became negative upon insertion of thin samples...

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Bibliographic Details
Published inAtomic energy (New York, N.Y.) Vol. 121; no. 2; pp. 140 - 147
Main Authors Andrianova, O. N., Dulin, V. A., Dulin, V. V., Andrianov, A. A.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.12.2016
Subjects
Hadrons
Heavy Ions
Nuclear Chemistry
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
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Summary:An unusual change of the contributed reactivity of uranium samples with 90% enrichment depending on the size was observed during experiments on the critical assembly of the large physical testing facility with a softened neutron spectrum: the reactivity became negative upon insertion of thin samples. The agreement between the calculations and experimental data in the description of this unusual change of reactivity was obtained by making changes in the radiative capture cross section of 235 U and the factors of resonance self-screening in the group approximation and by taking account of the possible missed narrow resonances of 235 U in the point representation description of the experiment.
ISSN:1063-4258
1573-8205
DOI:10.1007/s10512-016-0174-z