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

Left
Top
X
Right
Center
Bottom
Left
Top
A B
C D
A B
C D
Right
Bottom
C D
A B
C D
A B
X
A
C
Y
B
D
A B
C D
Invert reflection
X
Y
60°-rotational symmetry
Y
90°-rotational symmetry
NUAC14
Bottom boundary condition (effective for 2-D, 3-D)
= 0 Extrapolated
= 1 Reflected
NUAC15
Front boundary condition (effective for 3-D)
= 0 Extrapolated
= 1 Reflected
NUAC16
Back boundary condition (effective for 3-D)
= 0 Extrapolated
= 1 Reflected
NUAC17
Option for internal black absorber
= 0 No internal black absorber
> 0 Zone number of internal black absorber
An internal black absorber has the logarithmic differential (non-return)
boundary condition applied at its surfaces. This zone will be black to all groups
unless additional data are supplied to certain groups) by XMIS2 on Card-003-4.
The cross-sections given to the zone may be accepted to the specified groups. In
this case, the slowing-down neutrons into the groups specified as black absorber
are entirely absorbed. Only one zone is allowed as an internal black absorber.
NUAC18
Option to allow negative neutron flux
= 0 Negative flux is not allowed
> 0 Negative flux is allowed (suggested)
104