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Title
Japanese: 
English:Estimation of uncertainty in transmutation rates of LLFPs in a fast reactor transmutation system via an estimation of the cross-section covariances 
Author
Japanese: 山野 直樹, 稲倉恒法, 石塚 知香子, 千葉 敏.  
English: Naoki Yamano, Tsunenori Inakura, Chikako Ishizuka, Satoshi Chiba.  
Language English 
Journal/Book name
Japanese: 
English:Journal of Nuclear Science and Technology 
Volume, Number, Page Vol. 58    No. 5    pp. 567-578
Published date Nov. 29, 2020 
Publisher
Japanese: 
English:Taylor & Francis 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1080/00223131.2020.1845839
Abstract A new concept of transmutation system for six long-lived fission products (LLFPs: 79Se, 93Zr, 99Tc, 107Pd, 129I, and 135Cs) consisting of three small-size fast reactor cores was proposed. In order to establish a method to estimate the effects of cross-section uncertainties on the transmutation rates of the LLFPs, cross section covariances for the six LLFPs were estimated using a T6 system which includes resonance and statistical models via propagation of model uncertainties, and the uncertainties of transmutation rates and support factors of the six LLFPs in the three fast reactors were estimated based on a Total Monte Carlo (TMC) method. It was made clear that some of the transmutation rates of these LLFPs have large uncertainties indicating that the accuracy of cross sections for them is not enough, and hence the strategy for efficient transmutation may have to be reconstructed. It is concluded that the T6 system and the TMC method used in this study are quite effective not only to estimate the uncertainties of cross sections but also to assess the effect of error propagation throughout the series of calculations conducting in this study.

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