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Laser Scanning

Safe operation of a nuclear power plant (NPP) is highly linked to the early detection of potential failures.


Leak tightness of the reactor pressure vessel (RPV) is important for system integrity as leakages occurring during plant operation may result in unplanned shutdowns. Especially the vessel head flange and sealing surface must be free of any defects to ensure leak tightness. To prevent the risk of leakages, efficient methods are required for precise inspection and assessment.


We provide automated inspection and laser scanning to survey the sealing surfaces of RPV flange and closure head.
The line scanning procedure enables the determination of surface defect depth with very high accuracy of up to 5 μm.


The measurements not only show 3D geometry and position of surface defects, they also include information about 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 mounted to a wheel driven remotely-operated vehicle (ROV), thus enabling remote control with exact position indication and performance at minimized personnel dose. The adaptable ROV design meets the requirements of plant-specific geometries of RPV flange and closure head as well as head stand.


Upon demand, we apply a waterproof flange manipulator to avoid delays on the critical path of an outage.


The combination with other Framatome technologies like remote-controlled cleaning manipulators and qualified repair process provides an integral RPV flange sealing solution.


Your Benefits

  • Safe and reliable plant operation without unplanned shutdowns
  • Precise and repeatable execution and documentation of inspections
  • High accuracy of scanning  and identification of defects
  • Universally applicable tool  family for quick  setup  and performance
  • Field service  available worldwide

 

References

RPV flange and vessel head mating surface laser scanning has been performed at several NPPs to prevent leakages and/or precisely detect and localize defects in the sealing area.


Reactor types / designs:KWU boiling water reactor (BWR) and pressurized water reactor (PWR)

  • Framatome PWR
  • Westinghouse PWR
  • Generel Electric BWR

NPPs in:

  • Europe (Germany, Switzerland, Netherlands, UK, Spain, Slovenia)
  • USA
  • South Africa
  • South Korea

Interested in Laser Scanning – Reactor Pressure Vessel Sealing Surfaces?

CANDU Reactors VVER Reactors CANDO VVER Westinghouse