atomic pile
atomic reactor
pile **
chain reactor

"It must have sunk with an atomic pile on board."

The atomic pile can only fail safe no matter what happens.

They could anticipate changes in the flow of an atomic pile.

Every nation on earth must know how to construct an atomic pile by this time.

We're probably not more than a hundred miles from whatever impossible thing a natural atomic pile is.

Somewhere inside the box a tiny atomic pile was constructed.

He had heard many people moaning about the invention of the atomic pile.

Naturally he thought it was part of the atomic pile for power generation.

Only possible if China builds one atomic pile per week.

This was the building to house the atomic pile.