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Title: Environment-based pin-power reconstruction method for homogeneous core calculations

Abstract

Core calculation schemes are usually based on a classical two-step approach associated with assembly and core calculations. During the first step, infinite lattice assemblies calculations relying on a fundamental mode approach are used to generate cross-sections libraries for PWRs core calculations. This fundamental mode hypothesis may be questioned when dealing with loading patterns involving several types of assemblies (UOX, MOX), burnable poisons, control rods and burn-up gradients. This paper proposes a calculation method able to take into account the heterogeneous environment of the assemblies when using homogeneous core calculations and an appropriate pin-power reconstruction. This methodology is applied to MOX assemblies, computed within an environment of UOX assemblies. The new environment-based pin-power reconstruction is then used on various clusters of 3x3 assemblies showing burn-up gradients and UOX/MOX interfaces, and compared to reference calculations performed with APOLLO-2. The results show that UOX/MOX interfaces are much better calculated with the environment-based calculation scheme when compared to the usual pin-power reconstruction method. The power peak is always better located and calculated with the environment-based pin-power reconstruction method on every cluster configuration studied. This study shows that taking into account the environment in transport calculations can significantly improve the pin-power reconstruction so far asmore » it is consistent with the core loading pattern. (authors)« less

Authors:
; ;  [1]
  1. EDF R and D/SINETICS, 1 av du General de Gaulle, F92141 Claman Cedex (France)
Publication Date:
Research Org.:
American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
OSTI Identifier:
22107759
Resource Type:
Conference
Resource Relation:
Conference: ICAPP '12: 2012 International Congress on Advances in Nuclear Power Plants, Chicago, IL (United States), 24-28 Jun 2012; Other Information: Country of input: France; 7 refs.; Related Information: In: Proceedings of the 2012 International Congress on Advances in Nuclear Power Plants - ICAPP '12| 2799 p.
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 97 MATHEMATICAL METHODS AND COMPUTING; BURNABLE POISONS; BURNUP; CALCULATION METHODS; COMPUTER CALCULATIONS; CONFIGURATION; CONTROL ELEMENTS; FUEL ASSEMBLIES; MIXED OXIDE FUELS; NUCLEAR DATA COLLECTIONS; NUCLEAR POWER PLANTS; PWR TYPE REACTORS; REACTOR CORES; REACTOR FUELING; URANIUM OXIDES

Citation Formats

Leroyer, H., Brosselard, C., and Girardi, E. Environment-based pin-power reconstruction method for homogeneous core calculations. United States: N. p., 2012. Web.
Leroyer, H., Brosselard, C., & Girardi, E. Environment-based pin-power reconstruction method for homogeneous core calculations. United States.
Leroyer, H., Brosselard, C., and Girardi, E. Sun . "Environment-based pin-power reconstruction method for homogeneous core calculations". United States.
@article{osti_22107759,
title = {Environment-based pin-power reconstruction method for homogeneous core calculations},
author = {Leroyer, H. and Brosselard, C. and Girardi, E.},
abstractNote = {Core calculation schemes are usually based on a classical two-step approach associated with assembly and core calculations. During the first step, infinite lattice assemblies calculations relying on a fundamental mode approach are used to generate cross-sections libraries for PWRs core calculations. This fundamental mode hypothesis may be questioned when dealing with loading patterns involving several types of assemblies (UOX, MOX), burnable poisons, control rods and burn-up gradients. This paper proposes a calculation method able to take into account the heterogeneous environment of the assemblies when using homogeneous core calculations and an appropriate pin-power reconstruction. This methodology is applied to MOX assemblies, computed within an environment of UOX assemblies. The new environment-based pin-power reconstruction is then used on various clusters of 3x3 assemblies showing burn-up gradients and UOX/MOX interfaces, and compared to reference calculations performed with APOLLO-2. The results show that UOX/MOX interfaces are much better calculated with the environment-based calculation scheme when compared to the usual pin-power reconstruction method. The power peak is always better located and calculated with the environment-based pin-power reconstruction method on every cluster configuration studied. This study shows that taking into account the environment in transport calculations can significantly improve the pin-power reconstruction so far as it is consistent with the core loading pattern. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {7}
}

Conference:
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