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The nozzle surface near the dissimilar metal weld joining the nozzle to the reactor pressure vessel (RPV) cover shell is substantially hidden by a thermal sleeve in many plant designs. Access is limited to a 1.5 mm to 3.5 mm gap between the funnel-end thermal sleeve and the nozzle pipe.

AREVA NP has developed special blade probes for eddy current testing (ET) as well as visual testing (VT) of the pipe surface.
The manipulator and probe driver are remotely positioned to minimize the radiation exposure of the operator.

Your benefits

  • Surface inspection of total length of concerned region
  • Distinction between circumferential and axial defects
  • Remote tool control with no personnel beneath head limits dose

Interested in Control Rod Drive Nozzle Thermal Sleeve Gap Inspection?

AREVA NP Germany