Stability and accuracy of 3D neutron transport simulations using the 2D/1D method in MPACT

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• 作者：Benjamin Collins^a ; ¹ ; ^{collinsbs@ornl.gov" class="auth_mail" title="E-mail the corresponding author} ; Shane Stimpson^a ; ¹ ; ^{stimpsonsg@ornl.gov" class="auth_mail" title="E-mail the corresponding author} ; Blake W. Kelley^b ; ^{kelleybl@umich.edu" class="auth_mail" title="E-mail the corresponding author} ; Mitchell T.H. Young^b ; ^{youngmit@umich.edu" class="auth_mail" title="E-mail the corresponding author} ; Brendan Kochunas^b ; ^{bkochuna@umich.edu" class="auth_mail" title="E-mail the corresponding author} ; Aaron Graham^b ; ^{aarograh@umich.edu" class="auth_mail" title="E-mail the corresponding author} ; Edward W. Larsen^b ; ^{edlarsen@umich.edu" class="auth_mail" title="E-mail the corresponding author} ; Thomas Downar^b ; ^{downar@umich.edu" class="auth_mail" title="E-mail the corresponding author} ; Andrew Godfrey^a ; ^{godfreyat@ornl.gov" class="auth_mail" title="E-mail the corresponding author}
• 关键词：2D/1D method ; MOC ; MPACT
• 刊名：Journal of Computational Physics
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：326
• 期：Complete
• 页码：612-628
• 全文大小：1554 K

文摘

A consistent “2D/1D” neutron transport method is derived from the 3D Boltzmann transport equation, to calculate fuel-pin-resolved neutron fluxes for realistic full-core Pressurized Water Reactor (PWR) problems. The 2D/1D method employs the Method of Characteristics to discretize the radial variables and a lower order transport solution to discretize the axial variable. This paper describes the theory of the 2D/1D method and its implementation in the MPACT code, which has become the whole-core deterministic neutron transport solver for the Consortium for Advanced Simulations of Light Water Reactors (CASL) core simulator VERA-CS. Several applications have been performed on both leadership-class and industry-class computing clusters. Results are presented for whole-core solutions of the Watts Bar Nuclear Power Station Unit 1 and compared to both continuous-energy Monte Carlo results and plant data.