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The goal of the training session is to gain familiarity modeling the running-in phase of pebble bed reactors (PBRs) with the MOOSE-based tools Griffin and Pronghorn. Griffin includes capabilities for neutronics and depletion calculations and provides power densities to Pronghorn. Pronghorn uses the power densities to calculate temperatures using a porous medium flow model and user-input thermal-hydraulic conditions as well as simplified models for the pebble bed reactor structures. Griffin can use pregenerated multigroup libraries for cross sections or a new feature that enables using its own cross sections generated online. This workshop will provide hands-on exercises for online cross section generation, run-in phase modeling with Griffin, thermal-hydraulics modeling with Pronghorn, and multiphysics running-in modeling including a control rod withdrawal event from a non- equilibrium core.