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Laser Scanning

The safe operation of a nuclear power plant (NPP) depends on the early detection of failures. Depending on their geometry relative to the gasket trace, surface defects on reactor pressure vessel (RPV) mating surfaces may influence the leak tightness of the RPV. Leakages occurring during plant operation may result in unplanned shutdowns.


For more than a decade AREVA NP has applied laser scanning to survey the sealing surfaces at RPV flange and closure head.
The line scanning procedure enables the depth of surface defects to be determined with a very high accuracy: about 10 μm. The measurements not only show 3D geometry and position of surface defects, they also include information about the pre-tension of the RPV seal ring and the planarity of the seal surfaces. Accompanying replica and swab sampling techniques facilitate predictions about the existence of corrosive wear.


The laser scan head is remote-controlled by wheel driven vehicles (ROVs), thus enabling the exact position indication and a performance at minimized personnel dose. On demand AREVA NP uses a waterproof flange manipulator, which avoids delays on the critical path of an outage.


Your benefits

  • Long life plant operation without unplanned plant shutdowns
  • Timely, well-planned cleaning and repair methods from a single source
  • Decades of experience in outage service
  • Field service available worldwide
  • Universally applicable inspection and monitoring tool family

Interested in Laser Scanning – Reactor Pressure Vessel Sealing Surfaces?

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AREVA GmbH