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Capability of computing sensitivity coefficients with regard to Legendre scattering moments implemented in RMC   QIU Yishu1, WANG Zijie2, AUFIERO Manuele3, FRATONI Massimiliano4, and WANG Kan5   1. Department of Engineering Physics, Tsinghua University, Beijing, 100084, China (qys12@mails.tsinghua.edu.cn) 2. College of Science, Harbin Engineering University, Harbin, 150001, P.R. China (zijiewang0112@gmail.com) 3. Department of Nuclear Engineering, University of California, Berkeley, CA 94720, USA (manuele.aufiero@gmail.com) 4. Department of Nuclear Engineering, University of California, Berkeley, CA 94720, USA (maxfratoni@berkeley.edu) 5. Department of Engineering Physics, Tsinghua University, Beijing, 100084, China (wangkan@mail.tsinghua.edu.cn)   Abstract: In the past several years, different Monte Carlo codes have developed the capability of performing sensitivity and uncertainty analysis. Most of these Monte Carlo codes have focused on nuclear cross sections, fission neutron multiplicities and fission emission spectra. However, the angular scattering distributions would have a significant effect on the system where leakage is particularly important, and the scattering distributions are often represented by their Legendre moments; therefore, in this work, a capability of computing sensitivity coefficients of keff and different responses such as reaction rate ratios with regard to Legendre scattering moments is developed in the Reactor Monte Carlo (RMC) code. The new capability in RMC has been verified with SERPENT2 and a deterministic code, ERANOS, by two fast spectrum systems, i.e., the Jezebel and flattop problems. Good agreement among RMC, SERPENT2 and ERANOS is observed. Keyword: sensitivity coefficient; Legendre moment; Monte Carlo; RMC
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