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

The geometry model in collision probability method should be taken care. For
example, as the models for IGT= 8, 9, 16 calculate the collision probabilities for a
quarter of a fuel assembly, enter 1/4 of assembly power as POWERL. The model
for IGT=15 calculates them for a whole assembly while it assumes 60 degree
rotational symmetry. Then enter the whole assembly power.
If POWERL(i)=0.0 is entered, the cooling calculation (reactor stop) is executed,
where only radioactive decay is considered.
If IBC3=±3 is entered, the average flux in fuel zone corresponding to the initial
thermal power POWERL(1) is applied through the whole steps. The thermal power
at each step POWERL(i) after the initial step is calculated by the code regardless of
input values.
Block-3
/IBC1/
(PERIOD(i),i=1,IBC1)
Burn-up period (exposure) by step in unit specified by IBC2
If cooling calculation is intended and if burn-up unit is not day (IBC2=±1, ±2,
±5), enter cooling period (day) by negative value for the step of POWERL(i)=0.
Block-4 Required if IBC2