AddCriticalitySearchAction

Overview

The AddCriticalitySearchAction is responsible for performing a complete criticality search during the OpenMC solve. Examples of parameters which can be used for the criticality search include:

The converged value of the criticality search will automatically be populated into a postprocessor named critical_value.

warningwarning

If the convergence tolerance is too small (on the order of or smaller than the statistical standard deviation), convergence may not be possible. If the search fails to converge, use a looser tolerance or increase the number of particles.

Example Input File Syntax

As an example, a OpenMCMaterialDensity object is used to perform a criticality search based on the total density of material 1.

[Problem<<<{"href": "../../syntax/Problem/index.html"}>>>]
  type = OpenMCCellAverageProblem

  [CriticalitySearch<<<{"href": "../../syntax/Problem/CriticalitySearch/index.html"}>>>]
    type = OpenMCMaterialDensity
    material_id = 1
    minimum = 10000
    maximum = 20000
    tolerance = 1e-2
  []
[]
(test/tests/criticality/material_density/openmc.i)

When running this case, Cardinal will print out a table showing a summary of the results of the criticality search.


---------------------------------------------------------------------------
| Iteration | material 1 density [kg/m3] |   k (mean)   |   k (std dev)   |
---------------------------------------------------------------------------
|         0 |               1.000000e+03 | 6.620000e-02 |    1.098139e-03 |
|         1 |               3.000000e+04 | 1.621666e+00 |    2.077345e-02 |
|         2 |               1.840971e+04 | 1.102440e+00 |    1.108761e-02 |
|         3 |               1.634907e+04 | 9.942194e-01 |    1.174444e-02 |
|         4 |               1.645914e+04 | 9.961657e-01 |    1.040603e-02 |
|         5 |               1.666816e+04 | 1.008298e+00 |    1.162806e-02 |
|         6 |               1.652520e+04 | 1.013949e+00 |    1.304124e-02 |
|         7 |               1.647338e+04 | 9.847013e-01 |    1.192703e-02 |
|         8 |               1.650048e+04 | 9.890565e-01 |    1.018419e-02 |
|         9 |               1.651135e+04 | 1.010180e+00 |    1.071604e-02 |
|        10 |               1.650611e+04 | 1.001364e+00 |    1.163008e-02 |
|        11 |               1.650539e+04 | 9.971522e-01 |    1.117813e-02 |
|        12 |               1.650588e+04 | 1.020902e+00 |    1.023352e-02 |
|        13 |               1.650545e+04 | 9.994847e-01 |    1.192011e-02 |
|        14 |               1.650546e+04 | 1.002346e+00 |    1.093321e-02 |
|        15 |               1.650546e+04 | 9.943650e-01 |    7.631514e-03 |
---------------------------------------------------------------------------

Available CriticalitySearch Objects

  • Cardinal App
  • BoratedWaterSearches for criticality using natural boron ppm in water in units of weight ppm
  • OpenMCMaterialDensitySearches for criticality using material density in units of kg/m3
  • RotationSearchSearches for criticality by modifying cell rotation(s) in degrees

Input Parameters

  • active__all__ If specified only the blocks named will be visited and made active

    Default:__all__

    C++ Type:std::vector<std::string>

    Controllable:No

    Description:If specified only the blocks named will be visited and made active

  • inactiveIf specified blocks matching these identifiers will be skipped.

    C++ Type:std::vector<std::string>

    Controllable:No

    Description:If specified blocks matching these identifiers will be skipped.

Optional Parameters

  • control_tagsAdds user-defined labels for accessing object parameters via control logic.

    C++ Type:std::vector<std::string>

    Controllable:No

    Description:Adds user-defined labels for accessing object parameters via control logic.

Advanced Parameters