Dissertation•
Resolution of the control rod cusping problem for nodal methods
01 Jan 1984-
About: The article was published on 1984-01-01 and is currently open access. It has received 16 citations till now.
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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
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
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
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
Dissertation•
01 Jan 2017
TL;DR: This book is intended to be read as a stand-alone document, but can be modified for use as a guide to other books on the subject.
Abstract: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi Chapter
7 citations
Cites methods from "Resolution of the control rod cuspi..."
...Joo [16] focused on developing a method which would address rod decusping using only material compositions and node dimensions, rather than relying on boundary conditions as well....
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...One of the most basic methods of handling the cusping problem was through pre-tabulation of cross section for the partially rodded node (PRN) [16]....
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