Article ID Journal Published Year Pages File Type
1730617 Annals of Nuclear Energy 2006 10 Pages PDF
Abstract
The effects of the spatial discretization and temperature distribution approximation on the BWR assembly calculation were studied using the continuous energy Monte Carlo burn-up calculation under several conditions. The radial-division, temperature-distribution, and azimuthal-division effects of a fuel pellet for BWR fuel (8 × 8, wide-water-rod) were investigated. The calculation results indicate that the effect of the temperature distribution approximation on the assembly calculation is negligible, even if a pin-averaged temperature was assigned to all fuel pins. The effect of the spatial discretization of fuel pellets in the azimuthal direction brings about a 0.15%dk/k prediction error in k-infinity. This effect is caused by the change of the burn-up characteristics in the Gd-rods. Therefore, the azimuthal-division of Gd-rods is desirable to reduce the spatial discretization effect for BWR assembly with higher Gd fuel rods.
Related Topics
Physical Sciences and Engineering Energy Energy Engineering and Power Technology
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