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2.8 CITATION ; Multi-Dimensional Diffusion Calculation
The input of this section is required if IC2=5 or IC12=5 is specified in Sect.2.2 for the execution
of CITATION routine. The requirement keeps the original input format 6) so that the same input data
except the leading Blocks and final two Blocks can be used in separate execution of the original
CITATION code. The description below uses the term ‘Card’ instead of ‘Block’ for the input data
which are the same as original CITATION. The input data belonging to Card must be entered in the
fixed column format as in the original CITATION.
Several additional functions are available as seen in the leading Block specifications such as the
perturbation calculation, the application of anisotropic diffusion coefficients, the material dependent
fission neutron spectrum, and the calculations of the generation time and the effective delayed neutron
fraction, while several functions in the original CITATION are suppressed.
The CITATION can treat 12 types of models of one-, two- or three-dimensional geometries as
shown in Table 2.8-1. The input requirements are explained by using mainly models on Cartesian
coordinates (X-Y-Z coordinates), and other geometrical models correspond as shown in this table.
Attention should be paid to R-Z model, where the vertical direction is treated as Y-direction in the
CITATION.
Table 2.8-1 Geometries in CITATION and their correspondences to X-Y-Z model
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Geometry model X (column) Y (row) Z (plane)
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1 D slab X
1 D cylinder R
1 D sphere R S
2 D slab X Y
2 D cylinder R Z
2 D circle θ R
2 D hexagonal X H Y H
2 D triangular X T Y T
3 D slab X Y Z
3 D cylinder θ R Z
3 D hexagonal X H Y H Z
3 D triangular X T Y T Z
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In the CITATION, the terms ‘zone’, ‘region’ and ‘mesh’ are used as spatial disposition. A zone
is a unit to allocate a material (cross-section) and also is used as a spatial unit to edit neutron flux and
power distribution. A region is a geometrical unit defined by coordinates specified by the input data. A
zone consists of one or more region(s). A mesh is a subdivision of a region. As the finite differential
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