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Aldo Dall ' Osso

Bio: Aldo Dall ' Osso is an academic researcher. The author has contributed to research in topics: Reset (computing). The author has an hindex of 2, co-authored 2 publications receiving 22 citations.

Papers
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01 Jan 2002
TL;DR: In this paper, a method based on a physical equivalence was proposed to reduce the effect of rod cusping in neutronics calculations, where a strong discontinuity appears in the control rod worth versus rod insertion curve.
Abstract: In neutronics calculations control rods are modeled incrementing the cross sections by an amount interpolated in parametric tables. This amount depends on the average physical conditions of the node. For nodes containing the tip of a rod, a weighting factor must be applied in order to keep the correct reaction rate. Several methods exist to compute this factor. The simplest one is to take the volume fraction occupied by the tip of the control rod in the node. This method produces what is known as rod cusping: a strong discontinuity appears in the control rod worth versus rod insertion curve. The method developed here, based on a physical equivalence, allows a significant reduction of this effect.

18 citations

01 Jan 2002
TL;DR: A method to reset the core neutronic model in order the computed flux be in agreement with the detectors response, based on an equivalence procedure which permits to determine a reset parameter, called pseudo buckling, acting on the data of the model.
Abstract: Core monitoring systems based on online 3D calculations need algorithms to permit to compensate the inaccuracies in the neutronic model and in the process and incore detectors signals. It is presented here a method to reset the core neutronic model in order the computed flux be in agreement with the detectors response. The method is based on an equivalence procedure which permits to determine a reset parameter, called pseudo buckling, acting on the data of the model. It will be then presented some results showing the performance of the method.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: A moving mesh scheme based on hp-finite element method is proposed for the time dependent neutron diffusion equation that uses spatial meshes that change with the movement of the control rods avoiding the necessity of using equivalent material cross sections for the partially inserted cells.

17 citations

Journal ArticleDOI
TL;DR: In this paper, a new solution for the control rod cusping problem in the three-dimensional pin-by-pin core calculation is proposed, and the current advanced nodal code resolves this issue by estimating...
Abstract: A new solution for the control rod cusping problem in the three-dimensional pin-by-pin core calculation is proposed in this paper. The current advanced nodal code resolves this issue by estimating ...

16 citations

Journal ArticleDOI
TL;DR: It is demonstrated that the smoothly varying cross sections can be obtained by projecting the piecewise set of cross sections onto the set of Legendre polynomials up to a finite order and provided accurate results based on the C5G7-TD benchmark.

15 citations

Journal ArticleDOI
TL;DR: In this paper, two heterogeneous nodal methods based on the Variational Nodal Method (VNM) with diffusion approximation in three-dimensional Cartesian geometry are investigated with a code named Violet-Het3D for PWR control rod cusping effect and pin-by-pin calculation.

10 citations

Journal ArticleDOI
Bumhee Cho1, Nam Zin Cho1
TL;DR: The NLG iteration method is extended to make it capable of transient calculations of 3-D heterogeneous problems, and a neighboring spectral index (NSI) weighting method is suggested as a tool for correcting the rod cusping phenomenon for rod ejection problems.

9 citations