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Fission Gas Release Model

The fissionGasRelease class is used to handle the generation, diffusion and release of the gaseous fission products in OFFBEAT.

The fission gas release (FGR) model can be selected with the fgr keyword in the main dictionary of OFFBEAT (i.e. the solverDict dictionary, located in the constant folder).

Classes

Currently OFFBEAT supports the following fgr models:

  • none - it neglects fission gas release (i.e. the gap gas composition remains as defined in the 0/gapGas file). This is the default choice in OFFBEAT if the user does not specify the fgr model in the solverDict.
  • SCIANTIX - the 0-D open-source code SCIANTIX (developed at the PoliMi) is used as the local FGR module.
  • SCIANTIXRIA - modification of the previous class, intended for use in RIA simulations. SCIANTIX is not actually called, but the SCIANTIX fields for grain concentration are read for initial condition of the transients. The fission gases are then released based on threshold (damage, burnup, temperature) defined by the user in the dictionary.