Difference between revisions of "Critical density iteration"
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An output variable <tt>ITER_NUC_FACTOR</tt> is included in the main <tt>[INPUT]_res.m</tt> results file. The output variable gives the mean multiplicative scaling factor applied to the iterated nuclides to achieve a critical system. | An output variable <tt>ITER_NUC_FACTOR</tt> is included in the main <tt>[INPUT]_res.m</tt> 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 [[Input_syntax_manual#set_his|set his]]) the <tt>[INPUT]_his[STEP].m</tt> 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. | ||
== Operation == | == Operation == | ||
Revision as of 10:12, 3 March 2017
Input
iternuc NZAI ZAI1 ZAI2 ... ZAINZAI [ NMAT MAT1 MAT2 ... MAXNMAT ]
| 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.
