PelletBrittleZone

Computes the brittle zone width on a per-pellet basis

Description

PelletBrittleZone computes the representative temperature profile for each fuel pellet with the least squared method (Olander, 1976): (1) where is the radial position along the pellet width.

The width of the zone in which the fuel pellet behaves in a fully brittle manner is then determined by comparing the temperature profile calculated in Eq. 1 to the threshold temperature. Following Olander (1976) the threshold temperature is set at 1473 K.

Regions of the pellet width which are below the threshold temperature are considered to be within the brittle zone of the fuel pellet.

Example Input Syntax


[UserObjects]
  [./pbz]
    type = PelletBrittleZone
    block = 2
    pellet_id = pellet_id
    temp = temp
    pellet_radius = 0.005305
    a_lower = 0.00226
    a_upper = 0.01496
    number_pellets = 1
    execute_on = 'initial linear'
  [../]
[]
(test/tests/fission_gas_behavior_sifgrs/sifgrs_athermal_release.i)

Input Parameters

  • number_pelletsnumber of pellets

    C++ Type:unsigned int

    Description:number of pellets

Required Parameters

  • pellet_idcoupled pellet ID

    C++ Type:std::vector

    Description:coupled pellet ID

  • tempcoupled temperature (K)

    C++ Type:std::vector

    Description:coupled temperature (K)

  • a_upperinitial upper axial position (m)

    C++ Type:double

    Description:initial upper axial position (m)

  • fuel_pin_geometryName of the UserObject that reads the pin geometry from the mesh.

    C++ Type:UserObjectName

    Description:Name of the UserObject that reads the pin geometry from the mesh.

  • pellet_radiusinitial pellet radius (m)

    C++ Type:double

    Description:initial pellet radius (m)

  • execute_onLINEARThe list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM.

    Default:LINEAR

    C++ Type:ExecFlagEnum

    Description:The list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM.

  • a_lowerlower axial position (m)

    C++ Type:double

    Description:lower axial position (m)

  • blockThe list of block ids (SubdomainID) that this object will be applied

    C++ Type:std::vector

    Description:The list of block ids (SubdomainID) that this object will be applied

Optional Parameters

  • enableTrueSet the enabled status of the MooseObject.

    Default:True

    C++ Type:bool

    Description:Set the enabled status of the MooseObject.

  • 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

    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.

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

    C++ Type:std::vector

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

  • 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

    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).

  • seed0The seed for the master random number generator

    Default:0

    C++ Type:unsigned int

    Description:The seed for the master random number generator

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

    Default:True

    C++ Type:bool

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

Advanced Parameters

Input Files