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Facility (NSTF)one of the world's largest facilities for ex-vessel passive decay heat removal testing-confirms the performance of reactor cavity cooling systems (RCCS) and similar passive confinement or containment decay heat removal systems in modern Small Modular Reactors. Originally built to aid in the development of General Electric's Power Reactor Innovative Small Module (PRISM) Reactor Vessel Auxiliary Cooling System (RVACS), the NSTF has a long history of providing confirmatory data for the airside of the RVACS. Argonne National Laboratory's NSTF is a state-of-the-art, large-scale facility for evaluating performance capabilities of containment cooling systems, providing reactor designers with data to validate computer simulations. Many of these simulations employ advanced computational tools running on supercomputers at Argonne's Leadership Computing Facility, home to a world-class computing capability dedicated to breakthrough science and engineering.