Difference between revisions of "Critical density iteration"
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== Input ==
== Input ==
'''''' ''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>'' ]
Revision as of 14:48, 8 June 2017
iter nuc 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|
- 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.
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 atomic density of 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.