Sensitivity Analysis of Core Neutronic Parameters in Electron Accelerator-driven Subcritical Advanced Liquid Metal Reactor

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• 作者：Marziye Ebrahimkhani^a ; Mostafa Hassanzadeh^b ; ^{m_hassanzadeh2003@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; ^{mhasanzadeh@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Sayed Amier Hossian Feghhi^c ; Darush Masti^a
• 关键词：Advanced Liquid Metal Reactor ; MCNPX Code ; Neutronic Parameters ; Sensitivity Analysis ; Spallation Target
• 刊名：Nuclear Engineering and Technology
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：48
• 期：1
• 页码：55-63
• 全文大小：3443 K

文摘

Calculation of the core neutronic parameters is one of the key components in all nuclear reactors. In this research, the energy spectrum and spatial distribution of the neutron flux in a uranium target have been calculated. In addition, sensitivity of the core neutronic parameters in accelerator-driven subcritical advanced liquid metal reactors, such as electron beam energy (E_e) and source multiplication coefficient (k_s), has been investigated. A Monte Carlo code (MCNPX_2.6) has been used to calculate neutronic parameters such as effective multiplication coefficient (k_eff), net neutron multiplication (M), neutron yield (Y_n/e), energy constant gain (G₀), energy gain (G), importance of neutron source (φ^∗), axial and radial distributions of neutron flux, and power peaking factor (P_max/P_ave) in two axial and radial directions of the reactor core for four fuel loading patterns. According to the results, safety margin and accelerator current (I_e) have been decreased in the highest case of k_s, but G and φ^∗ have increased by 88.9% and 21.6%, respectively. In addition, for LP1 loading pattern, with increasing E_e from 100 MeV up to 1 GeV, Y_n/e and G improved by 91.09% and 10.21%, and I_e and P_acc decreased by 91.05% and 10.57%, respectively. The results indicate that placement of the Np–Pu assemblies on the periphery allows for a consistent k_eff because the Np–Pu assemblies experience less burn-up.