Difference between revisions of "Critical density iteration"
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== Input == | == Input == | ||
| − | '''iternuc''' ''N<sub>ZAI</sub>'' ''ZAI<sub>1</sub>'' ''ZAI<sub>2</sub>'' ... ''ZAI<sub>N<sub>ZAI</sub></sub>'' [ ''N<sub>MAT</sub>'' ''MAT<sub>1</sub>'' ''MAT<sub>2</sub>'' ... ''MAX<sub>N<sub>MAT</sub></sub>'' ] | + | '''iternuc''' ''CYCLES'' ''KEFF'' ''N<sub>ZAI</sub>'' ''ZAI<sub>1</sub>'' ''ZAI<sub>2</sub>'' ... ''ZAI<sub>N<sub>ZAI</sub></sub>'' [ ''N<sub>MAT</sub>'' ''MAT<sub>1</sub>'' ''MAT<sub>2</sub>'' ... ''MAX<sub>N<sub>MAT</sub></sub>'' ] |
{| | {| | ||
| + | |- | ||
| + | | <tt>''CYCLES''</tt> | ||
| + | | : Number of additional inactive cycles to run for the convergence of the iteration. | ||
| + | |- | ||
| + | | <tt>''KEFF''</tt> | ||
| + | | : Target k-eff for the iteration. | ||
| + | |- | ||
| <tt>''N<sub>ZAI</sub>''</tt> | | <tt>''N<sub>ZAI</sub>''</tt> | ||
| : number of different nuclides (ZAI) included in the iteration | | : number of different nuclides (ZAI) included in the iteration | ||
Revision as of 13:44, 8 June 2017
Input
iternuc CYCLES KEFF NZAI ZAI1 ZAI2 ... ZAINZAI [ NMAT MAT1 MAT2 ... MAXNMAT ]
| CYCLES | : Number of additional inactive cycles to run for the convergence of the iteration. |
| KEFF | : Target k-eff for the iteration. |
| NZAI | : number of different nuclides (ZAI) included in the iteration |
| ZAIi | : the ZAI (e.g. 50100 for boron 10 ground state) of the nuclide to be included in the iteration |
| NMAT | : number of different materials included in the iteration (optional parameter) |
| MATi | : the name of the material to be included in the iteration |
Notes:
- If a list of materials is not given, all materials that contain the included nuclides are included in the iteration.
- The initial concentration of the nuclides to be iterated should be larger than zero.
- The critical concentration iteration currently only works for nuclides that have a reactivity effect mainly through neutron absorption. Specifically, critical concentrations of fissile, moderating or reflecting nuclides cannot be iterated using this card.
Output
An output variable ITER_NUC_FACTOR is included in the main [INPUT]_res.m results file. The output variable gives the mean multiplicative scaling factor applied to the iterated nuclides to achieve a critical system.
If the batch history recording is set on (see set his) the [INPUT]_his[STEP].m history output file will contain batch-wise estimates for the scaling factor, which can be used to ensure the convergence of the scaling factor during the inactive cycles.
