Improved MPACT energy deposition and explicit heat generation coupling with CTF

Yuxuan Liu; Robert Salko; Kang Seog Kim; Xinyan Wang; Matthew Kabelitz; Sooyoung Choi; Brendan Kochunas; Benjamin Collins; William Martin

doi:10.1016/j.anucene.2020.107999

Improved MPACT energy deposition and explicit heat generation coupling with CTF

Yuxuan Liu, Robert Salko, Kang Seog Kim, Xinyan Wang, Matthew Kabelitz, Sooyoung Choi, Brendan Kochunas, Benjamin Collins, William Martin

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The CASL neutronics code MPACT assumes local energy deposition with equilibrium delayed energy for steady-state and transient calculations. These approximations limit the accurate representation of the heat generation in space and its variations over time, both of which are essential for power distribution and thermal–hydraulic coupling analyses. This paper presents an explicit energy deposition model considering the neutron and gamma heating of all regions and the time-dependent delayed energy. The MPACT/CTF interfaces are updated to transfer the explicit heat sources. The new model agrees well with MCNP for problems without thermal–hydraulic feedback. The MPACT/CTF coupled calculation for a hot-full-power quarter-core case using the new model exhibits a reduction of peak pin power by 2.3% and fuel centerline temperature by 17 K. The new model also shows a k_eff difference up to −100 pcm in depletion and a 30 K peak fuel temperature reduction in a reactivity-initiated-accident problem.

Original language	English
Article number	107999
Journal	Annals of Nuclear Energy
Volume	152
DOIs	https://doi.org/10.1016/j.anucene.2020.107999
State	Published - Mar 2021

Funding

This research was supported by the Consortium for Advanced Simulation of Light Water Reactors ( http://www.casl.gov ), an Energy Innovation Hub ( http://www.energy.gov/hubs ) for Modeling and Simulation of Nuclear Reactors under US Department of Energy Contract No. DE-AC05-00OR22725. This research also made use of the resources of the High Performance Computing Center at Idaho National Laboratory, which is supported by the Office of Nuclear Energy of the US Department of Energy and the Nuclear Science User Facilities under Contract No. DE-AC07-05ID14517. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://www.energy.gov/downloads/doe-public-access-plan).

Keywords

CTF
Delayed energy
Energy deposition
Gamma smearing
MPACT

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title = "Improved MPACT energy deposition and explicit heat generation coupling with CTF",

abstract = "The CASL neutronics code MPACT assumes local energy deposition with equilibrium delayed energy for steady-state and transient calculations. These approximations limit the accurate representation of the heat generation in space and its variations over time, both of which are essential for power distribution and thermal–hydraulic coupling analyses. This paper presents an explicit energy deposition model considering the neutron and gamma heating of all regions and the time-dependent delayed energy. The MPACT/CTF interfaces are updated to transfer the explicit heat sources. The new model agrees well with MCNP for problems without thermal–hydraulic feedback. The MPACT/CTF coupled calculation for a hot-full-power quarter-core case using the new model exhibits a reduction of peak pin power by 2.3% and fuel centerline temperature by 17 K. The new model also shows a keff difference up to −100 pcm in depletion and a 30 K peak fuel temperature reduction in a reactivity-initiated-accident problem.",

keywords = "CTF, Delayed energy, Energy deposition, Gamma smearing, MPACT",

author = "Yuxuan Liu and Robert Salko and Kim, {Kang Seog} and Xinyan Wang and Matthew Kabelitz and Sooyoung Choi and Brendan Kochunas and Benjamin Collins and William Martin",

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doi = "10.1016/j.anucene.2020.107999",

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AU - Liu, Yuxuan

AU - Salko, Robert

AU - Kim, Kang Seog

AU - Wang, Xinyan

AU - Kabelitz, Matthew

AU - Choi, Sooyoung

AU - Kochunas, Brendan

AU - Collins, Benjamin

AU - Martin, William

PY - 2021/3

Y1 - 2021/3

N2 - The CASL neutronics code MPACT assumes local energy deposition with equilibrium delayed energy for steady-state and transient calculations. These approximations limit the accurate representation of the heat generation in space and its variations over time, both of which are essential for power distribution and thermal–hydraulic coupling analyses. This paper presents an explicit energy deposition model considering the neutron and gamma heating of all regions and the time-dependent delayed energy. The MPACT/CTF interfaces are updated to transfer the explicit heat sources. The new model agrees well with MCNP for problems without thermal–hydraulic feedback. The MPACT/CTF coupled calculation for a hot-full-power quarter-core case using the new model exhibits a reduction of peak pin power by 2.3% and fuel centerline temperature by 17 K. The new model also shows a keff difference up to −100 pcm in depletion and a 30 K peak fuel temperature reduction in a reactivity-initiated-accident problem.

AB - The CASL neutronics code MPACT assumes local energy deposition with equilibrium delayed energy for steady-state and transient calculations. These approximations limit the accurate representation of the heat generation in space and its variations over time, both of which are essential for power distribution and thermal–hydraulic coupling analyses. This paper presents an explicit energy deposition model considering the neutron and gamma heating of all regions and the time-dependent delayed energy. The MPACT/CTF interfaces are updated to transfer the explicit heat sources. The new model agrees well with MCNP for problems without thermal–hydraulic feedback. The MPACT/CTF coupled calculation for a hot-full-power quarter-core case using the new model exhibits a reduction of peak pin power by 2.3% and fuel centerline temperature by 17 K. The new model also shows a keff difference up to −100 pcm in depletion and a 30 K peak fuel temperature reduction in a reactivity-initiated-accident problem.

KW - CTF

KW - Delayed energy

KW - Energy deposition

KW - Gamma smearing

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Improved MPACT energy deposition and explicit heat generation coupling with CTF

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