If the fuel remains in the reactor for long enough, other isotopes - such as plutonium 240 - are produced.

Currently, spent nuclear fuel remains in temporary storage at nuclear power plants around the country.

I extinguished it to save what little fuel remained and climbed on in the dark.

The pool has to remain full while any fuel remains, officials said.

He has pointed out, however, that radioactive fuel would remain at the site even if the plant were to close.

He doubted that much fuel remained in their tanks.

He still wondered how much fuel remained, and the thought nagged at him.

Enough fuel remained on board at the end of the flight to have allowed the balloon to fly four to five times as far.

The fuel and coolant remained within safe temperature limits as the reactor quickly shut itself down in both cases.

They have subsided somewhat elsewhere, but the fuel remains.