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Rob Howard & Lauren Layfield 6am - 10am
6 September 2018, 07:34 | Updated: 6 September 2018, 07:35
The work was due to start later on today, but we're hearing that's been put back.
It's due to a problem with getting equipment to dredge the seabed at Hinkley Point C building site in Somerset.
There have been prostests by environmental campaigners who are worried the mud is radioactive.
But Natural Resources Wales insist it would be safe.