US Labs Develop Griffin Reactor Simulation Platform

Scientists at Idaho National Laboratory and Argonne National Laboratory have developed Griffin, a reactor physics modeling and simulation software announced in 2025. The platform couples neutronics, thermal-hydraulics, structural mechanics and fuel performance to simulate reactor behavior across designs, winning a 2025 R&D 100 Award. Griffin aims to reduce costly prototypes, accelerate design cycles, and support microreactor and space reactor applications.