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Last Updated: Thursday, 20 December 2007, 09:17 GMT
Nuclear plant upgrade a success
Waste vessel lowered into the Thorp plant
Technical problems put the operation back 24 hours
Engineers have successfully replaced vital elements of a nuclear reprocessing plant in Cumbria.

A section of the roof of the Thorp facility at Sellafield was removed to allow four huge vessels to be lowered into position by a giant crane.

Technical difficulties meant the operation, involving 20-tonne vessels used to process liquid waste, was put back 24 hours.

Experts said the operation had proved to be "very challenging".

The vessels, which are 11m (36ft) long and cost 5m each, process liquid waste at the site, which is concentrated before it is sent to be turned into glass.

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