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

NUAC17
> 0 The constant for all groups applying to zone NUAC17
< 0 This is the total number of groups (negative) and Card-003-6 is to follow,
after any required above, which gives the internal black absorber
boundary constants for each energy group. Zero value indicates that the
black absorber boundary condition is not applied to that group. (flux is
calculated with given cross-sections, e.g. for fast group).
= 0 The code will use the built-in value for all groups and the absorber will
be black over all energy
Note:
For the case that involves strong absorber like control rod where the diffusion
theory can not be applied, the internal black absorber may be introduced. The
extrapolation constant is given by the comparison with the results of a transport
calculation or/and experiments. If the cross-sections are used for certain groups,
specify XMIS2 0 This value is used to normalize the power distribution and flux level.
= 0 Defaulted value is used.
Note:
For 1-D or 2-D calculation, give the thermal power by assuming the whole core
of unit length (cm) for the transverse direction(s). For example, to the X-Y
calculation of the core with thermal power 3,000MWt in the effective core height
100cm, give XMIS3 = 3000/100 = 30.
XMIS4
Fission to power Conversion factor
> 0 Ratio of thermal energy to fission energy (XMIS3 is divided by this)
Normally set 1.0.
= 0 Defaulted value is used
XMIS5
Core symmetry factor
The thermal power given by XMIS3 are divided by this number.
> 0 Core symmetry factor i.e. fraction of the core considered; e.g. for 1/4
symmetric core, enter XMIS5=0.25
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