During a safety test, Valar Atomics ran its prototype reactor at full temperature for approximately one week before shutting off all active safety systems to observe its passive response.

In a passive safety test, Valar Atomics' reactor core temperature rose to a stable equilibrium point and then cooled down over a two-day period without any active intervention.

The Valar Atomics reactor design is orders of magnitude safer than existing light water reactors in the United States.