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Optimised Iteration in Coupled Monte Carlo - Thermal-Hydraulics Calculations
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics. KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0002-7943-7517
2016 (English)In: SNA + MC 2013 - JOINT INTERNATIONAL CONFERENCE ON SUPERCOMPUTING IN NUCLEAR APPLICATIONS + MONTE CARLO / [ed] Caruge, D Calvin, C Diop, CM Malvagi, F Trama, JC, E D P SCIENCES , 2016, article id UNSP 03406Conference paper (Refereed)
Abstract [en]

This paper describes an optimised iteration scheme for the number of neutron histories and the relaxation factor in successive iterations of coupled Monte Carlo and thermal-hydraulic reactor calculations based on the stochastic iteration method. The scheme results in an increasing number of neutron histories for the Monte Carlo calculation in successive iteration steps and a decreasing relaxation factor for the spatial power distribution to be used as input to the thermal-hydraulics calculation. The theoretical basis is discussed in detail and practical consequences of the scheme are shown, among which a nearly linear increase per iteration of the number of cycles in the Monte Carlo calculation. The scheme is demonstrated for a full PWR type fuel assembly. Results are shown for the axial power distribution during several iteration steps. A few alternative iteration method are also tested and it is concluded that the presented iteration method is near optimal.

Place, publisher, year, edition, pages
E D P SCIENCES , 2016. article id UNSP 03406
Keyword [en]
Monte Carlo, thermal-hydraulics, coupling schemes
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-214918DOI: 10.1051/snamc/201403406ISI: 000408930200114OAI: oai:DiVA.org:kth-214918DiVA, id: diva2:1144167
Conference
Joint 8th International Conference on Supercomputing in Nuclear Applications (SNA) / 4th Monte Carlo Meeting (MC), OCT 27-31, 2013, Paris, FRANCE
Note

QC 2017-09-25

Available from: 2017-09-25 Created: 2017-09-25 Last updated: 2017-09-25Bibliographically approved

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Publisher's full texthttp://eucardapplications.hud.ac.uk/otherevents/

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Dufek, Jan

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