Several zirconium-clad fuel rods of highly enriched uranium (HEU) are seen on a table. A hand rolls more beside the others, making a total of 6 rods. An engineer is seen at a work station associated with testing of the prototype pressurized water reactor plant for the USS Nautilus (SSN 571). Scene shifts to the Atomic Energy Commission's National Reactor Testing Station in Idaho, where a truck is delivering a hydraulic cooling pump for the prototype reactor. View across barren terrain of a building at the site, where the prototype reactor is being tested. Closer view of the building and monitoring equipment housed in a small structure outside. Closeup of reactor pressure vessel being moved on an overhead crane and lowered into position and installed inside the facility. Instrumented control panel for the prototype reactor. A man steps to the panel and manipulates the main control wheel. Closeup of gauge reflecting effects of control movements.