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Observations on Processing Neutron Nuclear Data from the JEF-1 (Joint Evaluation File) Fundamental Cross Section Library with the Karlsruhe Version of the Processing System NJOY

机译:使用卡尔斯鲁厄版本的加工系统处理JEF-1(联合评估文件)基本横断面库中的中子核数据的观察NJOY

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During the generation of a new group constant set for application in PWR fuel cycle analysis, many irregularities in the group cross sections and selfshielding factors were observed. As the fundamental cross section library the Joint Evaluated File JEF-1 was used, the processing of these data to group constants was performed with the Karlsruhe version of the processing system NJOY. Most of the irregularities occur for high concentration of the nuclide in question, especially in the unresolved resonance region. The irregularities are discussed in some detail and possible reasons for their occurrence are given. This investigation is done for all group cross sections of the heavy nuclei (U-232, -234, -235, -236, -238, Pu-238, -239, -240, -241, -242, Am-241, -243), structural materials, oxygen, boron, and hydrogen bound in water. All irregularities are removed, partly formally. The application of this new group constant library to the analysis of the PWR-fuel cycle will be described in another paper. (ERA citation 14:019587)

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