Keyword:PARTITION

PARTITION npart
sym(n) xpart(n) n=1,npart

---

This keyword allows the material to be split or partitioned into two streams during an irradiation or cooling. The part that continues to be considered by the code consists of all elements not specified (npart elements are specified) and the fractions xpart(n) of the specified elements sym(n). The stream containing the remainder is lost and cannot be followed any further by the code.

Typical uses of this keyword might be to model recycling of irradiated material or the loss by diffusion of tritium from a material. In the first case PARTITION would be used after irradiation and cooling and would model the loss of volatile elements during re-fabrication. In the second case the irradiation might be split into several intervals and PARTITION used in each interval to model the loss of tritium

Example usage:

< -- Control phase -- >
...
FISPACT
* Title of the simulation
< -- Initial phase -- > 
...
< -- Inventory phase -- > 
...
PARTITION 2
 Ar 0.01
 K  0.20
...

In this case all elements except argon and potassium remain unmodified, all argon isotopes are reduced by a factor of 100 and all potassium isotopes are reduced to a fifth of their values before the keyword was used.