- R8.31446The universal gas constant for the units used.
Default:8.31446
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The universal gas constant for the units used.
- temperatureThe name of the average temperature postprocessor value.
C++ Type:PostprocessorName
Unit:(no unit assumed)
Controllable:No
Description:The name of the average temperature postprocessor value.
- volumeThe name of the postprocessor(s) that holds the value of the internal volume in the cavity
C++ Type:std::vector<PostprocessorName>
Unit:(no unit assumed)
Controllable:No
Description:The name of the postprocessor(s) that holds the value of the internal volume in the cavity
Plenum Pressure BC Action
Sets up the calculation of the plenum pressure as a function of temperature, plenum volume, and moles of fission and plenum gases.
Description
The PlenumPressure block is used to specify internal rod pressure as a function of temperature, cavity volume, and moles of gas. The PlenumPressure boundary condition uses two levels of nesting within the BCs block. This allows the pressure to be applied properly in all coordinate directions within a single input file block. The Cavity Pressure Action system consists of three separate actions, listed in Table 1, which are all created within the same block.
Usage Guide
The volume and pressure specified in the plenum pressure block along with the initial condition specified in the temperature variable block are used to calculate the initial moles. The initial moles are then used to update the plenum pressure throughout the simulation.
commentnote:Use Gas Fabrication Temperature as Initial Value
Make sure the initial temperature in the PlenumPressure block is set appropriately: Either use a postprocessor to couple to the average rod interior temperature, as shown in the example input syntax, or set the value of initial_temperature to the temperature of the gas when fabricated, usually room temperature (293 K). This initial temperature value is used to calculate the number of initial moles in the CavityPressurePostprocessor or the CavityPressurePPAction.
The postprocessors coupled to the plenum pressure boundary condition (gas volume and rod interior temperature) need to be executed at each linear iteration such that the plenum pressure is calculated for that specific timestep. If calculated at the end of each timestep, the calculation uses volume and temperature from the previous step to calculate the plenum pressure for the current step, causing a lag in the plenum pressure used and reported for that timestep.
Table 1: Correspondence Among Action Functionality and MooseObjects
| Functionality | Replaced Classes | Specific Action | Associated Parameters |
|---|---|---|---|
| Calculation of the initial moles quantity | PlenumPressureUserObject | PlenumPressureUOAction | volume: the name of the internal volume postprocessor to calculate the volume between the fuel and clad |
R: the universal gas constant | |||
temperature : the name of the average temperature postprocessor | |||
cladding_failure_status : whether or not the cladding has failed | |||
equilbrium_pressure : the equilibrium pressure after cladding failure | |||
| Store the value of the initial moles | CavityPressurePostprocessor | CavityPressurePPAction | output_initial_moles: the postprocessor name to used to report the initial moles of gas |
| Calculation of the current internal pressure, including contributions from fission gas release | PlenumPressureUserObject | PlenumPressureUOAction | output: the name of the cavity pressure postprocessor |
| Store the internal pressure value | CavityPressurePostprocessor | CavityPressurePPAction | output: the name of the cavity pressure postprocessor |
| Apply the calculated internal pressure traction | Pressure | CavityPressureAction | boundary: the list of boundary IDs to which the pressure should be applied |
displacements : a string of the displacement variables to which the Pressure BC should be applied |
Example Input File Syntax
-!listing examples/NuclearMaterialActions/LWR/Normal/2D_discrete_finiteStrain_action/2D_discrete_finiteStrain_action.i block=BCs/PlenumPressure-
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
- additional_volumesThe name of the postprocessor(s) that hold additional volumes that are connected to the cavity but not meshed.
C++ Type:std::vector<PostprocessorName>
Unit:(no unit assumed)
Controllable:No
Description:The name of the postprocessor(s) that hold additional volumes that are connected to the cavity but not meshed.
- axial_gas_communicationName of the UserObject that contains the AxialGasCommunication.
C++ Type:UserObjectName
Controllable:No
Description:Name of the UserObject that contains the AxialGasCommunication.
- cladding_failure_statusName of the postprocessor that tracks the failure status of the cladding.
C++ Type:PostprocessorName
Unit:(no unit assumed)
Controllable:No
Description:Name of the postprocessor that tracks the failure status of the cladding.
- equilibrium_pressureName of the postprocessor holding the equilibrium pressure.
C++ Type:PostprocessorName
Unit:(no unit assumed)
Controllable:No
Description:Name of the postprocessor holding the equilibrium pressure.
- 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.
- incremental_calculationFalseCalculate change in pressure due to incremental changes associated with loss or gain of gas.
Default:False
C++ Type:bool
Controllable:No
Description:Calculate change in pressure due to incremental changes associated with loss or gain of gas.
- initial_pressure0The initial pressure in the cavity. If not given, a zero initial pressure will be used.
Default:0
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The initial pressure in the cavity. If not given, a zero initial pressure will be used.
- initial_temperatureInitial temperature (optional)
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:Initial temperature (optional)
- layered_clad_internal_volumeName of the UserObject that contains the layered internal volume.
C++ Type:UserObjectName
Controllable:No
Description:Name of the UserObject that contains the layered internal volume.
- layered_gas_gap_temperatureName of the UserObject that contains the layered gas gap temperature.
C++ Type:UserObjectName
Controllable:No
Description:Name of the UserObject that contains the layered gas gap temperature.
- material_inputThe name of the postprocessor(s) that holds the amount of material injected into the plenum.
C++ Type:std::vector<PostprocessorName>
Unit:(no unit assumed)
Controllable:No
Description:The name of the postprocessor(s) that holds the amount of material injected into the plenum.
- refab_pressureThe pressure of fill gas at refabrication.
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The pressure of fill gas at refabrication.
- refab_temperatureThe temperature at refabrication.
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The temperature at refabrication.
- refab_timeThe time at which the plenum pressure must be reinitialized due to fuel rod refabrication.
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The time at which the plenum pressure must be reinitialized due to fuel rod refabrication.
- refab_typeThe type of refabrication. 0 for instantaneous reset of gas, 1 for reset with constant fraction until next refabrication
C++ Type:std::vector<unsigned int>
Controllable:No
Description:The type of refabrication. 0 for instantaneous reset of gas, 1 for reset with constant fraction until next refabrication
- refab_volumeThe gas volume at refabrication.
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The gas volume at refabrication.
- startup_time0The amount of time during which the pressure will ramp from zero to its true value.
Default:0
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The amount of time during which the pressure will ramp from zero to its true value.
- temperature_of_additional_volumesThe name of the postprocessor(s) that hold the temperatures of the additional volumes.
C++ Type:std::vector<PostprocessorName>
Unit:(no unit assumed)
Controllable:No
Description:The name of the postprocessor(s) that hold the temperatures of the additional volumes.
Optional Parameters
- allow_duplicate_execution_on_initialFalseIn the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).
Default:False
C++ Type:bool
Controllable:No
Description:In the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).
- execute_onINITIAL LINEARThe list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
Default:INITIAL LINEAR
C++ Type:ExecFlagEnum
Controllable:No
Description:The list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
- execution_order_group0Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.
Default:0
C++ Type:int
Controllable:No
Description:Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.
- force_postauxFalseForces the UserObject to be executed in POSTAUX
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in POSTAUX
- force_preauxFalseForces the UserObject to be executed in PREAUX
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in PREAUX
- force_preicFalseForces the UserObject to be executed in PREIC during initial setup
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in PREIC during initial setup
Execution Scheduling 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.
- enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:Yes
Description:Set the enabled status of the MooseObject.
- use_displaced_meshTrueWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.
Default:True
C++ Type:bool
Controllable:No
Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.
Advanced Parameters
- prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Unit:(no unit assumed)
Controllable:No
Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
- use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.
Default:False
C++ Type:bool
Controllable:No
Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.
Material Property Retrieval Parameters
Associated Actions
Available Actions
- Bison App
- PlenumPressureUOActionSets up the calculation of the plenum pressure as a function of temperature, plenum volume, and moles of fission and plenum gases.