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

fuel pin: MU08F0U2 and those in MOX fuel pin: MU08F0M2 on MICREF file are
discriminated by the seventh character (x-tag=U or M). Therefore, the same x-tag
should not be used for different resonant materials in a case or in consecutive
cases.
p-tag
Tag internally filled to specify Legendre component and also whether fine or
coarse in energy group structure. Any character given in the input is replaced by
the code.
= ‘0’ coarse (few) and isotropic (with transport correction if by PIJ)
= ‘1’ coarse and P 1 component (by S N calculation)
= ‘2’ fine and isotropic (with transport correction)
= ’3’ fine and P 1 component
= ’4’ fine and P 0 component
2 NCOM Enter NCOM=0 always (not used)
3 NISO Number of nuclides to compose the mixture (given by Block-3).
Enter NISO=0 to specify a set of cross-sections which were already formed into
MACROWRK or MACRO file.
If the member specified by MATNAME exists already, even if NISO>0 and
composition is given, formation of cross-sections is skipped and the old one will be
used.
4 TEMP Physical temperature of the mixture in Kelvin (K).
Any temperature can be accepted for the interpolations of 1) the THERMAL
library and 2) the resonance self-shielding factor, and 3) Doppler broadening of the
Public MCROSS library, unless the extrapolation is required.
5 XL l ; the mean chord length of the resonance absorber lump used to include
heterogeneous effect in the interpolation of resonance self-shielding factor in NR
or IR approximation, and also used in PEACO for the constant to yield a
non-dimensional blackness for the interpolations of the collision probabilities.
Generally l is defined as
l = 4 V / S ,
where V is the volume of the mixture, S is the surface area.
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