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Contractor Amec has succeeded in melting simulated radioactive waste, locking it into the ground as a vitrified mass that, it claims, is 10 times stronger than concrete. The £5M full scale test was carried out in Washington State to show that nuclear waste can be disposed of by locking it permanently into the ground. It involved placing waste in a large underground chamber capped with concrete and passing enormous electric currents through it via two electrodes. Temperatures reached ...

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