Tuesday, March 31, 1998 Published at 17:52 GMT 18:52 UK
Dounreay's £200m clean-up
The clean-up will take years and cost millions
The government is to spend more than £200 million cleaning a contaminated shaft at the Dounreay nuclear plant in the north of Scotland.
The shaft was sealed more than 20 years ago but is still leaking radioactivity.
It was confirmed that the shaft contains about 1,000 cubic metres of intermediate-level waste, and some 4kg of plutonium and 100kg of uranium.
Lorraine Mann, from Scotland Against Nuclear Dumping, said there was a real danger that the ground around the shaft will give way soon.
Although experts said the blast had not caused "significant damage", pictures released to the BBC in October 1996 suggested the explosion was extremely powerful.
The blast blew a 12.5 tonne concrete plug four metres to one side. Shattered concrete was thrown some 60 metres beyond the perimeter fence and scaffolding poles were propelled up to 75 metres onto the foreshore.
Documents obtained by the BBC for a documentary on Dounreay last year showed that after the explosion, highly radioactive contamination was found around the waste shaft, some of it well outside the boundary fence of the nuclear plant.
During routine monitoring of the site in the weeks following the blast, contamination of the roads was around 100 times higher than normal, the programme reported.
But the plant management have always maintained that another photograph, taken inside the shaft shortly after the blast, showed that although debris had fallen in, the waste itself was largely undisturbed by the explosion.