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SHTV, as a technique for core calculation using spatial homogenization and temperature variation

Maleki Moghaddam, N ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.anucene.2010.05.008
  3. Publisher: 2010
  4. Abstract:
  5. The accuracy of static neutronic parameters in the nuclear reactors depends upon the determination of group constants of the diffusion equation in the desired geometry. Although several methods have been proposed for calculating these parameters, there is still the need for more reliable methods. In this paper a powerful and innovative method based on Spatial Homogenization and Temperature Variation (SHTV) of physical properties of a WWER-1000 nuclear reactor core for calculating the relative power distribution of Fuel Assemblies (FA) and the hot fuel rod, is presented. The method is based on replacing the heterogeneous lattices of materials with different properties by an equivalent homogeneous mixture of these material for determining the few group constants, while the effect of temperature variation in the fuel and coolant density along the axial core direction is considered. All calculations are performed using WIMS and CITATION codes. The obtained results are compared with the results of Final Safety Analysis Report (FSAR) prepared by the designer, and good agreement between the two results is shown
  6. Keywords:
  7. Group constants ; Spatial homogenization ; Temperature variation ; VVER-1000 ; Coolant density ; Core calculations ; Diffusion equations ; Effect of temperature ; Fuel assembly ; Fuel rods ; Group constant ; Homogeneous mixtures ; Homogenization temperatures ; Innovative method ; Neutronics ; Relative power distributions ; Safety analysis reports ; Coolants ; Fuels ; Materials properties ; Nuclear energy ; Nuclear propulsion ; Reactor cores ; Reactor shutdowns ; Temperature distribution ; Homogenization method
  8. Source: Annals of Nuclear Energy ; Volume 37, Issue 9 , 2010 , Pages 1129-1138 ; 03064549 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0306454910001799