Implementation and verification of PyNE R2S with DAG-OpenMC

Zhang, Xiaokang; Shriwise, Patrick C; Liu, Songlin

doi:10.1016/j.fusengdes.2020.111837

Implementation and verification of PyNE R2S with DAG-OpenMC

Journal Article · Sun Nov 01 00:00:00 EDT 2020 · Fusion Engineering and Design

DOI:https://doi.org/10.1016/j.fusengdes.2020.111837· OSTI ID:1787850

Zhang, Xiaokang; Shriwise, Patrick C; Liu, Songlin

The mesh-based Rigorous-Two-Step (R2S) method has been widely used in the accurate estimation of the shutdown dose rate (SDR) of fusion systems. Several mesh-based R2S code has been implemented based on Monte Carlo particle transport code MCNP5 or DAG-MCNP5 and inventory calculation code such as FISPACT-II, ALARA or ACAB. Recently, the OpenMC, a community-developed Monte Carlo particle transport code, implemented the photon particle transport capability, which enables OpenMC to be used in R2S. In this paper, PyNE R2S is extended with the support of DAG-OpenMC, i.e., OpenMC with DAGMC. Modifications that allow PyNE to read the flux result in the state point file of OpenMC has been implemented to PyNE R2S workflow. A custom source routine of OpenMC that reads the photon source file from PyNE R2S and sampling photon particle in OpenMC photon transport has been implemented in OpenMC. With these modifications, PyNE R2S is now capable of performing R2S calculations with both DAG-MCNP5 and DAG-OpenMC. The ITER FNG dose rate benchmark problem has been used to validate the code. The FNG neutron source has been modified for neutron transport with DAG-OpenMC. The shutdown dose rate of 19 cooling times has been calculated and compared with the experimental data and the computational results of other R2S codes. The results of PyNE R2S with DAG-OpenMC show satisfactory agreement with the experimental data and other computational results. Therefore, we consider PyNE R2S with DAG-OpenMC is a reliable code to calculate the SDR of fusion systems.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1787850

Journal Information:: Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Journal Issue: 111837 Vol. 160; ISSN 0920-3796

Country of Publication:: United States

Language:: English

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