Since then, it has also operated a pressurized water reactor to produce tritium.

This heavy water went into nuclear reactors in 1967 to produce tritium needed for the device .

The Government-owned plant produces the radioactive materials plutonium and tritium for nuclear weapons.

Administration experts said that when a reactor is restarted it does not immediately produce tritium for nuclear weapons.

Two of the reactors, which were designed to produce plutonium and tritium for nuclear weapons, have been taken out of service permanently.

Britain did not have any facility to produce tritium and decided to use the Windscale piles.

The physics of producing tritium would be similar in a civilian or a military plant.

And the Government is considering converting a civilian reactor abandoned before it was finished to produce tritium.

Some cells sporadically produced tritium, a standard byproduct of nuclear fusion.

Now all three of the reactors that can produce tritium are out of service.