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Variational assimilation for xenon dynamical forecasts in neutronic using advanced background error covariance matrix modelling

Ponçot, Angélique and Argaud, Jean-Philippe and Bouriquet, Bertrand and Erhard, Patrick and Gratton, Serge and Thual, Olivier Variational assimilation for xenon dynamical forecasts in neutronic using advanced background error covariance matrix modelling. (2013) Annals of Nuclear Energy, 60. 39-50. ISSN 0306-4549

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Official URL: http://dx.doi.org/10.1016/j.anucene.2013.04.026

Abstract

Data assimilation method consists in combining all available pieces of information about a system to obtain optimal estimates of initial states. The different sources of information are weighted according to their accuracy by the means of error covariance matrices. Our purpose here is to evaluate the efficiency of variational data assimilation for the xenon induced oscillations forecasts in nuclear cores. In this paper we focus on the comparison between 3DVAR schemes with optimised background error covariance matrix B and a 4DVAR scheme. Tests were made in twin experiments using a simulation code which implements a mono-dimensional coupled model of xenon dynamics, thermal, and thermal–hydraulic processes. We enlighten the very good efficiency of the 4DVAR scheme as well as good results with the 3DVAR one using a careful multivariate modelling of B.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Annals of Nuclear Energy website : http://dx.doi.org/10.1016/j.anucene.2013.04.026
HAL Id:hal-00832455
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > EDF (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Olivier THUAL
Deposited On:04 Jun 2013 14:27

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