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Last Updated: Wednesday, 24 January 2007, 11:51 GMT
Clean up begins at Dounreay plant
Dounreay with cows in the foreground
Up to 400 boreholes are being drilled
One of the "biggest clean up challenges in the world" has begun at the Dounreay nuclear complex in Caithness.

Up to 400 boreholes are being drilled around the site's waste shaft in the biggest step so far towards its eventual clean out.

The project will prevent large volumes of ground water flowing into the shaft during waste retrieval and becoming contaminated.

The work also aims to reduce the risk of leakage.

The work has started as managers at Dounreay reassured the public that there is no cause for concern after the most radioactive particle to date was found on nearby Sandside Beach.

It is the fourth to be discovered in three days bringing the total to 81.

Waste store planned for Dounreay
22 Jan 07 |  Highlands and Islands
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21 Nov 06 |  Highlands and Islands
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15 Nov 06 |  Highlands and Islands
Dounreay particles found on beach
07 Nov 06 |  Highlands and Islands
Beach particles talks break down
16 Aug 06 |  Highlands and Islands

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