Adding Cardinal model of a 7-Pin LFR demonstration case

[hapfang]

Model Description

This tutorial documents the development of a Cardinal multiphysics model aimed at predicting "hot channel factors" (HCF) in fast reactor designs, which utilizes Griffin, MOOSE Heat Conduction Module, and NekRS.

Project description

The model development was funded by DOE NEAMS program.

Impact

The model serves as a good reference model for multiphysics modeling of advanced reactors using NEAMS reactor simulation codes.