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Estimation of errors in the cumulative Monte Carlo fission source
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.ORCID iD: 0000-0002-7943-7517
2014 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 72, 151-155 p.Article in journal (Refereed) Published
Abstract [en]

We study the feasibility of estimating the error in the cumulative fission source in Monte Carlo criticality calculations by utilising the fundamental-mode eigenvector of the fission matrix. The cumulative fission source, representing the source combined over active cycles, contains errors of both statistical and systematic nature. Knowledge of the error in the cumulative fission source is crucial as it determines the accuracy of computed neutron flux and power distributions. While statistical errors are present in the eigenvector of the fission matrix, it appears that these are not (or they are only weakly) correlated to the errors in the cumulative fission source. This ensures the suggested methodology gives error estimates that are distributed around the real errors, which is also supported by results of our numerical test calculations.

Place, publisher, year, edition, pages
2014. Vol. 72, 151-155 p.
Keyword [en]
Monte Carlo criticality, Fission source, Cumulative, Convergence, Error, Bias
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-150895DOI: 10.1016/j.anucene.2014.05.003ISI: 000340314000017Scopus ID: 2-s2.0-84901913487OAI: oai:DiVA.org:kth-150895DiVA: diva2:746831
Funder
EU, FP7, Seventh Framework Programme, 295971
Note

QC 20140915

Available from: 2014-09-15 Created: 2014-09-11 Last updated: 2017-12-05Bibliographically approved

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Dufek, Jan

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