Improved Monte Carlo – Perturbation method for estimation of control Rod Worths in a research reactor

Silva Kalcheva, Edgar Koonen, André Beeckmans de West-Meerbeeck

Research outputpeer-review


A hybrid method dedicated to improve the experimental technique for estimation of control rod worths in a research reactor is presented. The method uses a combination of Monte Carlo technique and perturbation theory. The perturbation theory is used to obtain the relation between the relative rod efficiency and the buckling of the reactor with partially inserted rod. A series of coefficients, describing the axial absorption profile are used to correct the buckling for an arbitrary composite rod, having complicated burn up irradiation history. These coefficients have to be determined – by experiment or by using some theoretical/numerical method. In the present paper they are derived from the macroscopic absorption cross sections, obtained from detailed Monte Carlo calculations by MCNPX 2.6.F of the axial burn up profile during control rod life. The method is validated on measurements of control rod worths at the BR2 reactor. Comparison with direct Monte Carlo evaluations of control rod worths is also presented. The uncertainties, arising from the used approximations in the presented hybrid method are discussed
Original languageEnglish
Title of host publicationInternational conference on Physics of Reactors 2008
Subtitle of host publicationPHYSOR 08
Place of PublicationInterlaken, Switzerland
PublisherPSI - Paul Scherrer Institut
Number of pages10
ISBN (Print)9781617821219
StatePublished - 16 Sep 2008
Event2008 - PHYSOR - International Conference on the Physics of Reactors: Nuclear Power: A Sustainable Resource - Interlaken
Duration: 14 Sep 200819 Sep 2008


Conference2008 - PHYSOR - International Conference on the Physics of Reactors
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