Critical density iteration
Revision as of 13:06, 4 May 2017 by Ville Valtavirta (talk | contribs) (Ville Valtavirta moved page Critical concentration iteration to Upcoming:Critical concentration iteration without leaving a redirect: Starting to use the upcoming namespace.)
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.
