Xenon

Results 3 issues of Xenon

## Reason The heat equation can be case in an "enthalpy form". This enthalpy form uses a change in enthalpy from a reference state as the primary variable solved for...

T: task
C: Modules/Heat Transfer

Other microreactor input files need to used the `IG_110` grade of graphite. This changes all of the inputs to use the same type of graphite grade. Closes #537

## Reason Due to some changes in BISON's `GraphiteThermalMatrix`, a review of the graphite compact material properties for the HP-MR found that the type was not consistent. As such, changing...