Application of a Bayesian/Generalised Least-Squares method to generate correlations between independent neutron fission yield data

Fiorito, Luca; Diez de la Obra, Carlos Javier; Cabellos de Francisco, Oscar Luis; Stankovskiy, Alexey; Van Den Eynde, Gert y Labeau, Pierre-Etienne (2014). Application of a Bayesian/Generalised Least-Squares method to generate correlations between independent neutron fission yield data. En: "Workshop Proceedings Nuclear Measurements, Evaluations and Applications (NEMEA-7) - Collaborative International Evaluated Library Organisation (CIELO". NEA/NSC/DOC(2014)13 . OECD, Issy-les-Moulineaux, France, pp. 278-286.

Descripción

Título: Application of a Bayesian/Generalised Least-Squares method to generate correlations between independent neutron fission yield data
Autor/es:
  • Fiorito, Luca
  • Diez de la Obra, Carlos Javier
  • Cabellos de Francisco, Oscar Luis
  • Stankovskiy, Alexey
  • Van Den Eynde, Gert
  • Labeau, Pierre-Etienne
Editor/es:
  • Nuclear Energy Agency, NEA
Tipo de Documento: Sección de Libro
Título del Evento: Nuclear Measurements, Evaluations and Applications (NEMEA-7) - Collaborative International Evaluated Library Organisation (CIELO
Fechas del Evento: 05/11/2013 - 08/11/2013
Lugar del Evento: Geel, Belgium
Título del Libro: Workshop Proceedings Nuclear Measurements, Evaluations and Applications (NEMEA-7) - Collaborative International Evaluated Library Organisation (CIELO
Fecha: 2014
Materias:
Escuela: E.T.S.I. Industriales (UPM)
Departamento: Ingeniería Nuclear [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Fission product yields are fundamental parameters for several nuclear engineering calculations and in particular for burn-up/activation problems. The impact of their uncertainties was widely studied in the past and valuations were released, although still incomplete. Recently, the nuclear community expressed the need for full fission yield covariance matrices to produce inventory calculation results that take into account the complete uncertainty data. In this work, we studied and applied a Bayesian/generalised least-squares method for covariance generation, and compared the generated uncertainties to the original data stored in the JEFF-3.1.2 library. Then, we focused on the effect of fission yield covariance information on fission pulse decay heat results for thermal fission of 235U. Calculations were carried out using different codes (ACAB and ALEPH-2) after introducing the new covariance values. Results were compared with those obtained with the uncertainty data currently provided by the library. The uncertainty quantification was performed with the Monte Carlo sampling technique. Indeed, correlations between fission yields strongly affect the statistics of decay heat. Introduction Nowadays, any engineering calculation performed in the nuclear field should be accompanied by an uncertainty analysis. In such an analysis, different sources of uncertainties are taken into account. Works such as those performed under the UAM project (Ivanov, et al., 2013) treat nuclear data as a source of uncertainty, in particular cross-section data for which uncertainties given in the form of covariance matrices are already provided in the major nuclear data libraries. Meanwhile, fission yield uncertainties were often neglected or treated shallowly, because their effects were considered of second order compared to cross-sections (Garcia-Herranz, et al., 2010). However, the Working Party on International Nuclear Data Evaluation Co-operation (WPEC)

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ID de Registro: 26200
Identificador DC: http://oa.upm.es/26200/
Identificador OAI: oai:oa.upm.es:26200
URL Oficial: https://www.oecd-nea.org/globalsearch/download.php?doc=78794
Depositado por: Memoria Investigacion
Depositado el: 16 Abr 2015 15:35
Ultima Modificación: 10 Nov 2017 08:52
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