SS316VolumetricSwellingEigenstrain

Computes the change in SS316 cladding volume due to irradiation by fast neutrons. This class applies a volumetric strain correction before adding the strain from this class to the diagonal entries of the eigenstrain tensor.

Description

SS316 fast reactor cladding experiences irradiation induced swelling as function of fluence and temperature. Several correlations are provided in Briggs et al. (1995). However, it should be noted that for fast flux fluence values greater than , the stress-free swelling correlation is expected to over-predict the swelling, and will only provide conservative estimates.

The volumetric swelling strain rate is given by: (1) where is the fractional volume change due to void formation, (2) Here, is the swelling rate parameter given as. (3) with (4) and (5) (6) where is temperature in Kelvin and is the incubation parameter in units of . To account for permanent swelling due to formation of voids during irradiation, the nominal stress-free swellng rate equation is used. (7) where is the negative fractional density change per second. (8) Integrating Eq. (7) over time yields the total volumetric swelling. In addition, is the curvature parameter. The neutron fluence, , is defined as the neutron fluence above 0.1 MeV. For Eq. (2), requires units of . Similarly, Eq. (8) requires to be in units of . Note, BISON requires all input to be in SI units, thus the flux is internally converted in SS316VolumetricSwellingEigenstrain.

Example Input Syntax

[Materials<<<{"href": "../../../syntax/Materials/index.html"}>>>]
  [swelling]
    type = SS316VolumetricSwellingEigenstrain<<<{"description": "Computes the change in SS316 cladding volume due to irradiation by fast neutrons. This class applies a volumetric strain correction before adding the strain from this class to the diagonal entries of the eigenstrain tensor.", "href": "SS316VolumetricSwellingEigenstrain.html"}>>>
    eigenstrain_name<<<{"description": "Material property name for the eigenstrain tensor computed by this model. IMPORTANT: The name of this property must also be provided to the strain calculator."}>>> = swelling
    fast_neutron_fluence<<<{"description": "Name of fast neutron fluence material property"}>>> = fast_neutron_fluence
    fast_neutron_flux<<<{"description": "Name of fast neutron flux material property"}>>> = fast_neutron_flux
    temperature<<<{"description": "Coupled temperature in Kelvin"}>>> = temp
    outputs<<<{"description": "Vector of output names where you would like to restrict the output of variables(s) associated with this object"}>>> = all
  []
[]
(test/tests/solid_mechanics/SS316_volumetric_swelling/coupled.i)

The eigenstrain name must also be passed to the strain calculator via the eigenstrain_names parameter in the QuasiStatic Action:

[Physics<<<{"href": "../../../syntax/Physics/index.html"}>>>]
  [SolidMechanics<<<{"href": "../../../syntax/Physics/SolidMechanics/index.html"}>>>]
    [QuasiStatic<<<{"href": "../../../syntax/Physics/SolidMechanics/QuasiStatic/index.html"}>>>]
      [all]
        add_variables<<<{"description": "Add the displacement variables"}>>> = true
        strain<<<{"description": "Strain formulation"}>>> = FINITE
        eigenstrain_names<<<{"description": "List of eigenstrains to be applied in this strain calculation"}>>> = swelling
      []
    []
  []
[]
(test/tests/solid_mechanics/SS316_volumetric_swelling/coupled.i)

Input Parameters

  • eigenstrain_nameMaterial property name for the eigenstrain tensor computed by this model. IMPORTANT: The name of this property must also be provided to the strain calculator.

    C++ Type:std::string

    Controllable:No

    Description:Material property name for the eigenstrain tensor computed by this model. IMPORTANT: The name of this property must also be provided to the strain calculator.

  • fast_neutron_fluenceName of fast neutron fluence material property

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:Name of fast neutron fluence material property

  • fast_neutron_fluxName of fast neutron flux material property

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:Name of fast neutron flux material property

  • temperatureCoupled temperature in Kelvin

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

    Unit:(no unit assumed)

    Controllable:No

    Description:Coupled temperature in Kelvin

Required Parameters

  • base_nameOptional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases

    C++ Type:std::string

    Controllable:No

    Description:Optional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases

  • blockThe list of blocks (ids or names) that this object will be applied

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

    Controllable:No

    Description:The list of blocks (ids or names) that this object will be applied

  • boundaryThe list of boundaries (ids or names) from the mesh where this object applies

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

    Controllable:No

    Description:The list of boundaries (ids or names) from the mesh where this object applies

  • computeTrueWhen false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the MaterialBase via MaterialBasePropertyInterface::getMaterialBase(). Non-computed MaterialBases are not sorted for dependencies.

    Default:True

    C++ Type:bool

    Controllable:No

    Description:When false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the MaterialBase via MaterialBasePropertyInterface::getMaterialBase(). Non-computed MaterialBases are not sorted for dependencies.

  • constant_onNONEWhen ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

    Default:NONE

    C++ Type:MooseEnum

    Options:NONE, ELEMENT, SUBDOMAIN

    Controllable:No

    Description:When ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

  • declare_suffixAn optional suffix parameter that can be appended to any declared 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 declared properties. The suffix will be prepended with a '_' character.

  • swelling_namevolumetric_swelling_strainName of material property calculated here corresponding to burnup dependent swelling

    Default:volumetric_swelling_strain

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:Name of material property calculated here corresponding to burnup dependent swelling

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.

  • enableTrueSet the enabled status of the MooseObject.

    Default:True

    C++ Type:bool

    Controllable:Yes

    Description:Set the enabled status of the MooseObject.

  • implicitTrueDetermines whether this object is calculated using an implicit or explicit form

    Default:True

    C++ Type:bool

    Controllable:No

    Description:Determines whether this object is calculated using an implicit or explicit form

  • seed0The seed for the master random number generator

    Default:0

    C++ Type:unsigned int

    Controllable:No

    Description:The seed for the master random number generator

  • use_displaced_meshFalseWhether 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:False

    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

  • output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)

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

    Controllable:No

    Description:List of material properties, from this material, to output (outputs must also be defined to an output type)

  • outputsnone Vector of output names where you would like to restrict the output of variables(s) associated with this object

    Default:none

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

    Controllable:No

    Description:Vector of output names where you would like to restrict the output of variables(s) associated with this object

Outputs 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

  • total_swelling_scaling_factor1Scaling factor to be applied to the swelling strain. Used for sensitivity and calibration studies

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Scaling factor to be applied to the swelling strain. Used for sensitivity and calibration studies

Advanced: Scaling Factors Parameters

Input Files

References

  1. L. L. Briggs, L. K. Chang, and D. J. Hill. Safety Analysis and Technical Basis for Establishing an Interim Burnup Limit for Mark-V and Mark-VA Fueled Subassemblies in EBR-II. Technical Report ANL-NSE-1, Argonne National Laboratory, 1995.[BibTeX]