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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제47권 제7호
발행연도
2015.1
수록면
791 - 803 (13page)

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The effective cross sections (XSs) in the direct whole core calculation code nTRACER are evaluated by the equivalence theory-based resonance-integral-table method using the WIMS-based library as an alternative to the subgroup method. The background XSs, as well as the Dancoff correction factors, were evaluated by the enhanced neutron-current method. A method, with pointwise microscopic XSs on a union-lethargy grid, was used for the generation of resonance-interference factors (RIFs) for mixed resonant absorbers. This method was modified by the intermediate-resonance approximation by replacing the potential XSs for the non-absorbing moderator nuclides with the background XSs and neglecting the resonance-elastic scattering. The resonance-escape probability was implemented to incorporate the energy self-shielding effect in the spectrum. The XSs were improved using the proposed method as compared to the narrow resonance infinite massbased method. The RIFs were improved by 1% in 235U, 7% in 239Pu, and >2% in 240Pu. To account for thermal feedback, a new feature was incorporated with the interpolation of pre-generated RIFs at the multigroup level and the results compared with the conventional resonance-interference model. This method provided adequate results in terms of XSs and k-eff. The results were verified first by the comparison of RIFs with the exact RIFs, and then comparing the XSs with the McCARD calculations for the homogeneous configurations, with burned fuel containing a mixture of resonant nuclides at different burnups and temperatures. The RIFs and XSs for the mixture showed good agreement, which verified the accuracy of the RIF evaluation using the proposed method. The method was then verified by comparing the XSs for the virtual environment for reactor applicationbenchmark pin-cell problem, as well as the heterogeneous pin cell containing burned fuel with McCARD. The method works well for homogeneous, as well as heterogeneous configurations.
#Dancoff factor #Enhanced neutron current method #Equivalence theory #Resonance integral #Self-shielding #Subgroup method

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참고문헌 (14)

참고문헌 신청
A. T. Godfrey / 2014 / VERA Core Physics Benchmark Progression Problem Specifications google schola A. Yamamoto / 2008 / Evaluation of background cross sections for heterogeneous and complicated geometry by the enhanced neutron current method / J. Nucl. Sci. Technol 45 : 12 google schola D.G. Cacuci / 2010 / Handbook of Nuclear Engineering / Springer google schola F. Leszczynski / 2007 / WIMS Library Update / IAEA google schola H.G. Joo / 2009 / Subgroup weight generation based on shielded pin-cell cross section conservation / Ann. Nucl. Energy 36 : 859 ~ 868 google schola

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