CUED Publications database

Log-linear substep method for Monte Carlo depletion coupled codes

Kotlyar, D and Shwageraus, E (2016) Log-linear substep method for Monte Carlo depletion coupled codes. In: UNSPECIFIED pp. 455-462..

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Abstract

Coupled Monte Carlo bumup codes aim at evaluating the time evolution of different parameters, such as nuclide densities, for accurate modeling of different reactor designs and associated fuel cycles. Recently, a major deficiency in numerical stability of existing Monte Carlo coupling schemes was identified. Therefore, new coupling schemes were derived, implemented and verified. These methods are iterative and rely on the end-of-step reaction rates to evaluate the end-of-step nuclide densities. Here, we demonstrate that applying such methods to realistic problems may lead to inaccurate results. The solution proposed in this work relies on the substep method that allows reducing the time discretization errors. The proposed and tested sub-step method also assumes that the reaction rates are linear functions of the logarithm of the nuclide densities. The method was implemented in BGCore code and subsequently used to perform 3D analysis of UO 2 unit cell loaded with Gd 2 O 3 . The results demonstrate that better accuracy and hence computational efficiency can be achieved.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:39
Last Modified: 23 Nov 2017 04:22
DOI: