Looks basically like the TRIGA reactor design (without the water shielding). Seems to have similar challenges with rapid load changes. At one time I thought NASA was looking at something like this tied together with a battery pack that would allow for rapid changes in dynamic load without a lot of stress on powering up/down the reactor. And now I can't find it. Sigh.

If you're a billionaire building your bunker this would be the ultimate off-grid power source :-).

It's a lot different from a TRIGA. It doesn't have hydrogen in the fuel and it uses high temperature/high pressure helium gas as the coolant (vs. water in a TRIGA).

We did run a nuclear reactor in space once that did use TRIGA fuel. It was called SNAP-10A. More recently, the Kilopower test ran a reactor on land but intended for space with a U-Mo metallic fuel.