Both nuclear weapons production and naval reactors require fuel containing concentrated U-235.

The damage is so extensive that the reactor requires dismantling for repairs.

Nuclear reactors require no oxygen for combustion and emit no exhaust gas.

The tubular reactor does not require moving mechanical parts and is inexpensive to build.

Such thermal reactors require much less of the expensive fissile fuel to start and have a slow, gentle response in power changes.

As I understand it uranium based reactors require isotope enrichment.

Existing American reactors require 11 million to 12 million of these units a year; the new plant will produce 3 million.

The reactor required an enormous amount of graphite blocks and uranium pellets.

While the submarine was only halfway through her design lifespan, her reactor core required refueling.

When a reactor requires a big overhaul, his group thinks, it should be scrapped.