Desarrollo y aplicaciones de nuevas bibliotecas de secciones eficaces neutrónicas para H2O, D2O y HDO. / Generation and application of new neutron cross section libraries for H2O, D2O, and HDO.

Márquez Damián, José I. (2014) Desarrollo y aplicaciones de nuevas bibliotecas de secciones eficaces neutrónicas para H2O, D2O y HDO. / Generation and application of new neutron cross section libraries for H2O, D2O, and HDO. PhD Thesis in Engineering Sciences, Universidad Nacional de Cuyo, Instituto Balseiro.

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Abstract in Spanish

Las leyes de scattering para agua pesada y liviana disponibles en las bibliotecas de datos evaluados están basadas esencialmente en dos modelos, y ambos utilizan espectros de frecuencias obtenidos experimentalmente en la década de 1960. Estos modelos tienen diferencias sustanciales con mediciones de secciones eficaces y, dependiendo de la aplicación, un impacto significativo en cálculos neutrónicos. Para mejorar esta situación, en esta tesis se presenta una metodología basada en cálculos de dinámica molecular para la obtención de espectros generalizados de frecuencias y generación de modelos para calcular leyes de scattering. Esta metodología se utilizó para calcular espectros de frecuencias para agua liviana, pesada y semipesada, que fueron validados con valores experimentales disponibles en la bibliografía. Utilizando estos espectros de frecuencia y datos experimentales se desarrollaron modelos de scattering y se calcularon leyes de scattering en formato ENDF-6 y secciones eficaces para agua liviana, pesada y semipesada. Estas secciones eficaces resultan un avance respecto a los cálculos con modelos existentes. Finalmente, se realizó una aplicación de estas secciones eficaces a problemas de ingeniería nuclear. Se encontró una mejora significativa en el cálculo de sistemas críticos moderados y reflejados por agua pesada, y en el cálculo de transmisión de neutrones fríos en agua pesada.

Abstract in English

The scattering laws for light and heavy water available from evaluated nuclear data libraries are based essentially on two models, and both use parameters that were originally measured in the 1960’s. These models show substantial differences with cross section measurements and, depending on the application, a significant impact on some neutronic calculations. To improve over the existing situation, in this thesis a molecular-dynamics-based methodology for the calculation of generalized frequency spectra and the generation of models to compute scattering laws is presented. This methodology was used to calculate frequency spectra for light water, heavy water and HDO, which were validated against experimental values available in the literature. These calculated spectra and experimental values were used to calculate scattering laws in ENDF-6 format and cross sections for light water, heavy water and HDO. These cross sections result in an advance over the cross sections calculated with the existing scattering models. Finally, these cross sections were applied to nuclear engineering problems. A significant improvement was found in the calculation of heavy water moderated and reflected critical systems, and in the calculation of cold neutron transmission in heavy water.

Item Type:Thesis (PhD Thesis in Engineering Sciences)
Keywords:Scattering; Dispersión; Heavy water; Agua pesada, [Scattering law; Ley de scattering; Thermal cross section; Sección eficaz térmica; Light water; Agua liviana; Agua semipesada]
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Subjects:Nuclear engineering
Divisions:Energía nuclear > Ingeniería nuclear > Física de neutrones
ID Code:475
Deposited By:Marisa G. Velazco Aldao
Deposited On:26 Nov 2014 13:51
Last Modified:26 Nov 2014 13:51

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