Complex models of nodal nuclear data

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Dufek, Jan,1978-Chalmers University of Technology, Applied Physics,Nuclear Engineering,Chalmers tekniska högskola (författare)

Complex models of nodal nuclear data

Artikel/kapitelEngelska2011

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2011
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LIBRIS-ID:oai:DiVA.org:kth-86864
ISBN:9788563688002
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-86864URI
https://research.chalmers.se/publication/141682URI

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Språk:engelska
Sammanfattning på:engelska

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QC 20120411
During the core simulations, nuclear data are required at various nodal thermal-hydraulic and fuel burnup conditions. The nodal data are also partially affected by thermal-hydraulic and fuel burnup conditions in surrounding nodes as these change the neutron energy spectrum in the node. Therefore, the nodal data are functions of many parameters (state variables), and the more state variables are considered by the nodal data models the more accurate and flexible the models get. The existing table and polynomial regressionmodels, however, cannot reflect the data dependences on many state variables. As for the table models, the number of mesh points (and necessary lattice calculations) grows exponentially with the number of variables. As for the polynomial regression models, the number of possible multivariate polynomials exceeds the limits of existing selection algorithms that should identify a few dozens of the most important polynomials. Also, the standard scheme of lattice calculations is not convenient for modelling the data dependences on various burnup conditions since it performs only a single or few burnup calculations at fixed nominal conditions. We suggest a new efficient algorithm for selecting the most important multivariate polynomials for the polynomial regression models so that dependences on many state variables can be considered. We also present a new scheme for lattice calculations where a large number of burnup histories are accomplished at varied nodal conditions. The number of lattice calculations being performed and the number of polynomials being analysed are controlled and minimised while building the nodal data models of a required accuracy.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Annan teknik hsv//swe
ENGINEERING AND TECHNOLOGY Other Engineering and Technologies hsv//eng
TEKNIK OCH TEKNOLOGIER Annan teknik Övrig annan teknik hsv//swe
ENGINEERING AND TECHNOLOGY Other Engineering and Technologies Other Engineering and Technologies not elsewhere specified hsv//eng
NATURVETENSKAP Fysik Annan fysik hsv//swe
NATURAL SCIENCES Physical Sciences Other Physics Topics hsv//eng
nuclear nodal data models
group cross sections
polynomial regression
lattice calculations

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Chalmers University of Technology, Applied PhysicsNuclear Engineering (creator_code:org_t)

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Ingår i:International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2011)9788563688002

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International Conference on Mathematics and Computational Methods Applied to Nuc... (Sök värdpublikationen i LIBRIS)

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Av författaren/redakt...: Dufek, Jan, 1978 ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Annan teknik

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Annan teknik; och Övrig annan tekn ...

NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Annan fysik

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Av lärosätet: Kungliga Tekniska Högskolan; Chalmers tekniska högskola

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