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Stabilization effect of fission source in coupled Monte Carlo simulations
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
2017 (English)In: Nuclear engineering and technology : an international journal of the Korean Nuclear Society, ISSN 1738-5733, E-ISSN 2234-358X, Vol. 49, no 5, p. 1095-1099Article in journal (Refereed) Published
Abstract [en]

A fission source can act as a stabilization element in coupled Monte Carlo simulations. We have observed this while studying numerical instabilities in nonlinear steady-state simulations performed by a Monte Carlo criticality solver that is coupled to a xenon feedback solver via fixed-point iteration. While fixedpoint iteration is known to be numerically unstable for some problems, resulting in large spatial oscillations of the neutron flux distribution, we show that it is possible to stabilize it by reducing the number of Monte Carlo criticality cycles simulated within each iteration step. While global convergence is ensured, development of any possible numerical instability is prevented by not allowing the fission source to converge fully within a single iteration step, which is achieved by setting a small number of criticality cycles per iteration step. Moreover, under these conditions, the fission source may converge even faster than in criticality calculations with no feedback, as we demonstrate in our numerical test simulations.

Place, publisher, year, edition, pages
Korean Nuclear Society , 2017. Vol. 49, no 5, p. 1095-1099
Keyword [en]
Monte Carlo, Coupled simulation, Fixed-point iteration, Numerical stability, Feedback
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-215396DOI: 10.1016/j.net.2017.02.008ISI: 000410895900022Scopus ID: 2-s2.0-85026259118OAI: oai:DiVA.org:kth-215396DiVA, id: diva2:1148298
Note

QC 20171010

Available from: 2017-10-10 Created: 2017-10-10 Last updated: 2017-10-10Bibliographically approved

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CiteExportLink to record
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  • apa
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  • de-DE
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  • nn-NB
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  • Other locale
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Output format
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