Benchmarking of the Transient Reactor Physics Simulation Code: G4-STORK

Abstract

The objective of this project was to model and simulate the neutron multiplication factor (k) of a simple PWR fuel pin in G4-STORK as well as MCNP6, and compare the results to help ascertain the validity of G4-STORK. The G4-STORK simulations were performed in two modes: generational and dynamic. These simulations were checked for agreement with theoretical principles of reactor physics. Meanwhile, the MCNP6 simulation results were checked against results from deterministic codes (HELIOS, NEWT) [1]. In addition, various changes to the algorithm and physics models of G4-STORK were applied to make it more comparable to MCNP6 in its assumptions [2].MCNP6 and G4-STORK were found to be in close agreement when G4-STORK ran in generational mode. Discrepancies were found when G4-STORK used the dynamic method, which is the theoretically correct approach. The discrepancies grew as the k factor strayed further from unity.