S3G reactor

[1][2] Once the design was proven, the prototype continued operation to train students and test new systems and materials.

The core also utilized a rod configuration called "skewed divergent" for ease of maintenance.

The S3G prototype was located at West Milton, N.Y. and consisted of a submarine reactor unit, engine compartments and a few office spaces.

There were airlocks at each end of the containment hull and a negative atmospheric pressure was maintained in the unit.

The negative pressure was to ensure that any gasses released into the prototype wouldn't escape into the local environment.