Keyword:STEP

STEP

---

This keyword starts the solution of the inventory equations over the time interval specified. It differs from the ATOMS keyword in that it generates only a single time line for each time interval. Its primary use is in multiple step irradiation phases. An example of this use is when the irradiating flux is repeatedly adjusted to maintain a constant power level:

Example usage, where multiple steps are performed to maintain constant power and the nuclide inventory output is not required for each step:

< -- Control phase -- >
...
FISPACT
* Title of the simulation
< -- Initial phase -- > 
...
< -- Inventory phase -- > 
...
PULSE 9
POWER 120.0 1 301
TIME 0.1 YEARS STEP
ENDPULSE
POWER 120.0 1 301
TIME 0.1 YEARS ATOMS
...