JAEA-Data/Code 2007-004 - Welcome to Research Group for ...

Block-1 Control integers /18/
1 IGT Geometry type (See Fig.2.4-1 through 2.4-6)
= 1 One-dimensional sphere of multi-shells with the isotropically reflective
condition at the outer boundary.
= 2 One-dimensional slab of multi-layers.
Care should be taken of the boundary condition. If IBOUND=1 is
specified, not the perfect reflective (mirror) boundary condition but the
periodic condition is applied for this geometry so as to treat an
asymmetric cell. On the other hand, if a symmetric lattice is considered,
the full geometry must be given.
= 3 One-dimensional circular cylindrical divided by concentric annuli.
= 4 Square cylinder divided by concentric annuli.
A square cell is divided by the concentric circles into several regions.
It is to be noticed that the cell can be divided by the circle of which radius
exceeds the distance from the center to the flat.
= 5 Square cylinder of two-dimensional division.
A square cell sub-divided by the concentric circles and further by four
lines crossing the central axis. Each line makes an angle of 67.5° with a
flat of the square. While an annular ring is divided into eight pieces,
because of the octant symmetry assumed, two adjacent pieces per annular
division are left as independent regions.
= 6 Hexagonal cylinder divided by concentric annuli.
= 7 Hexagonal cylinder of two-dimensional division.
A hexagonal cell is divided by the concentric circles and also by six
lines crossing the central axis. Each line makes an angle of 75° with a flat
of the hexagon. While an annular ring is divided into twelve pieces,
because the 60° rotational symmetry is assumed, two adjacent pieces on
an annular division remain as independent regions.
= 8 Octant symmetric square pillar divided by X-Y coordinates.
= 9 Octant symmetric square pillar divided by X-Y coordinates with square
array of pin rods.
A pin rod can not lie on the grid line specified by RX(i). Different
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