EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONS
In coupled multiphysics simulations, single pin-averaged values are typically used to describe the temperature, power, and burnup within a given fuel pin. However, since xenon oscillations are largely driven by fuel temperatures, radially dependent quantities have been implemented in the Virtual Env...
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2021-01-01
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doaj-f54a2b9fd84c4b50ba25273530ca0b9b2021-08-02T17:50:15ZengEDP SciencesEPJ Web of Conferences2100-014X2021-01-012470202510.1051/epjconf/202124702025epjconf_physor2020_02025EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONSWalker Erik0Godfrey Andrew1Stimpson Shane2Collins Benjamin3Oak Ridge National LaboratoryOak Ridge National LaboratoryOak Ridge National LaboratoryOak Ridge National LaboratoryIn coupled multiphysics simulations, single pin-averaged values are typically used to describe the temperature, power, and burnup within a given fuel pin. However, since xenon oscillations are largely driven by fuel temperatures, radially dependent quantities have been implemented in the Virtual Environment for Reactor Applications. These radial-shaping functions are based on Zernike polynomial expansions and allow information to pass effectively between codes with differing spatial meshes. This work examines the effects of radial fuel temperature-shaping functions on the behavior of axial xenon oscillations. A test problem was developed from full-core, multi-cycle depletions using as-built fuel data. The center 25 assemblies of the full-core case were used to test the radial-shaping function by inducing an axial xenon oscillation using an instantaneous control rod movement. The test case was run with and without the radial shapes, and each component was also run individually. Including the shaping functions significantly impacted the xenon oscillations for this problem; the magnitude and period of the oscillations were altered, and large pin power and soluble boron differences were observed. Testing each component individually showed that the radial fuel temperature-shaping function had the largest effect.https://www.epj-conferences.org/articles/epjconf/pdf/2021/01/epjconf_physor2020_02025.pdfxenonoscillationzernikepolynomialsvera |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Walker Erik Godfrey Andrew Stimpson Shane Collins Benjamin |
spellingShingle |
Walker Erik Godfrey Andrew Stimpson Shane Collins Benjamin EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONS EPJ Web of Conferences xenon oscillation zernike polynomials vera |
author_facet |
Walker Erik Godfrey Andrew Stimpson Shane Collins Benjamin |
author_sort |
Walker Erik |
title |
EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONS |
title_short |
EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONS |
title_full |
EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONS |
title_fullStr |
EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONS |
title_full_unstemmed |
EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONS |
title_sort |
effects of fuel temperature-shaping functions on xenon oscillations |
publisher |
EDP Sciences |
series |
EPJ Web of Conferences |
issn |
2100-014X |
publishDate |
2021-01-01 |
description |
In coupled multiphysics simulations, single pin-averaged values are typically used to describe the temperature, power, and burnup within a given fuel pin. However, since xenon oscillations are largely driven by fuel temperatures, radially dependent quantities have been implemented in the Virtual Environment for Reactor Applications. These radial-shaping functions are based on Zernike polynomial expansions and allow information to pass effectively between codes with differing spatial meshes. This work examines the effects of radial fuel temperature-shaping functions on the behavior of axial xenon oscillations.
A test problem was developed from full-core, multi-cycle depletions using as-built fuel data. The center 25 assemblies of the full-core case were used to test the radial-shaping function by inducing an axial xenon oscillation using an instantaneous control rod movement. The test case was run with and without the radial shapes, and each component was also run individually. Including the shaping functions significantly impacted the xenon oscillations for this problem; the magnitude and period of the oscillations were altered, and large pin power and soluble boron differences were observed. Testing each component individually showed that the radial fuel temperature-shaping function had the largest effect. |
topic |
xenon oscillation zernike polynomials vera |
url |
https://www.epj-conferences.org/articles/epjconf/pdf/2021/01/epjconf_physor2020_02025.pdf |
work_keys_str_mv |
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