When this occurs in the layer on the outside of secondary, a shock wave is created that travels into the secondary, squeezing a small amount of fission fuel in its center.

It may also be possible to confine gaseous fission fuel magnetically, electrostatically or electrodynamically so that it would not touch (and melt) the reactor walls.

One might attempt to circumvent the problem by confining the fission fuel magnetically, in a manner similar to the fusion fuel in a tokamak.

The energy released by a given mass of fusion fuel is several times larger than that released by the same mass of a fission fuel.

The laboratory creation of new elements became a major enterprise of scientists and military leaders in 1940 with the synthesis of neptunium and later, of plutonium, the fission fuel of the bomb that destroyed Nagasaki.

Another alternative to fast breeders is thermal breeder reactors that use uranium-233 bred from thorium as fission fuel in the thorium fuel cycle.

All nuclear warheads contain conventional chemical explosives as well as nuclear fission fuel.

The fission fuel is in the form of metal oxides or carbides Pyrolytic graphite is the main structural material in these pebbles.

The effect of the nuclear intensifier, then, will be to make all the fission fuel go.

The fission reaction in an NSWR is dynamic and because the reaction products are exhausted into space it doesn't have a limit on the proportion of fission fuel that reacts.