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Dounreay Nuclear Establishment

Sea outfall. A 1.7m diameter hole was required to be drilled at 45o through the seabed to enter the existing rock tunnel outfall for the Nuclear Establishment at Dounreay.

A heavy duty offshore jack-up platform was used to achieve this because of the depth of water (25m) and potential stormy sea conditions.

The contract was a "one off" specially engineered operation requiring methods, systems, equipment, engineering kit and expertise never used in combination before.  The "radioactive" nature of the worksite necessitated remote control working, special QA procedures and special systems to deal with the drilling arisings.

The conductor tube connecting the platform to the seabed template/lorry weighed 120t.  An HDPE pipe was pulled from the shore along the tunnel up into the inclined hole to connect with diffuser outlets at the surface.

This project was a single action negotiated contract requiring high levels of technical competence and innovative solutions at all stages of the project.

Facts and figures

  • Client:
    AEA Technology
  • Engineer:
    D A Donald & Wishart (now Binnie Donald & Wishart)
  • Value:
  • Commencement Date:
    March 1992
  • Completion Date:
    October 1992
  • Project categories