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RISS 인기검색어
- 검색키워드
- 저자 : R. D. McKnight (검색결과 3 건)
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JENDL-4.0 Integral Testing for Fission Systems
R. D. McKnight,Kazuteru Sugino,Go Chiba,Yasunobu Nagaya,Kenji Yokoyama,Teruhiko Kugo,Makoto Ishikawa,Shigeaki Okajima 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Benchmark testing for the newly developed Japanese evaluated nuclear data library JENDL-4.0 is carried out by using a huge amount of the integral data. Benchmark calculations are performed with the continuous-energy Monte Carlo code with a large number of neutron histories or with the deterministic procedure which has been developed for fast reactor analyses in Japan. In the present paper, representative benchmark results are shown as a rapid report. They are the results for criticality of low enriched UO_2 or MOX fueled light water moderated systems, of uranium or plutonium fuelled solution systems, of various fast reactors, and results of PIE analyses for a PWR spent fuel and actinoide samples irradiated in fast reactors.
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New Benchmarks versus Old Benchmarks: A Comparison of the ICSBEP and CSEWG Benchmarks
R. M. Lell,R. D. McKnight 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
This paper presents results of validation calculations for a series of fast critical assemblies based on the traditional CSEWG benchmark models and the more current ICSBEP benchmark models. Benchmark results, based on continuous-energy Monte Carlo calculations using both the CSEWG and ICSBEP benchmark representations with various evaluated nuclear data libraries, are presented for 18 critical assemblies. Results are put on a comparable basis by applying corrections associated with each of the benchmark specifications allowing consistent comparison of the validation results from each model. For some of the assemblies, significant differences are observed in the C/E values. It is also observed that the bias between these models is dependent on the evaluated data libraries. More importantly, the comparisons extend beyond the calculated results and attempt to identify the extent of the differences in the benchmark models themselves, identifying differences in masses, compositions, geometry, and dimensions. Overwhelmingly, these small model differences occurred with the introduction of necessary modeling simplifications into the older models. The ICSBEP models, though limited to testing of criticality (k_(eff)), often contain more details of the experiment (and therefore introduce fewer simplifications into the models) and generally include more detailed assessment of the benchmark uncertainties, making these benchmarks of higher value for data validation.
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Application of AFCI Covariance Data to Uncertainty Evaluation of Fast System Integral Parameters
W. S. Yang,G. Aliberti,R. D. McKnight 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
This paper presents the application results of the AFCI-1.2 covariance data to the uncertainty evaluation of the main integral parameters of a series of fast systems with different fuel types, coolants, and transuranic element conversion ratios. Using generalized and depletion perturbation theory methods, sensitivity coefficients were calculated for the multiplication factor, Doppler coefficient, coolant void worth, and burnup reactivity swing. The uncertainties of these integral parameters were evaluated with the AFCI-1.2 covariance data and compared with those obtained with the BOLNA covariance data. The overall uncertainties estimated with the AFCI-1.2 data were generally comparable with those obtained with the BOLNA data. However, relative to the BOLNA data, the AFCI-1.2 data resulted in significantly increased contributions of ^(238)Pu fission and ^(241)Am fission cross sections, but significantly reduced contributions of ^(244)Cm fission, ^(238)U capture, ^(56)Fe inelastic scattering, and ^(10)B (n,α) cross sections.
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