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Inside Diameter Temper Bead for RV Head Repairs

The only proven approach that addresses all PWSCC flaw scenarios

Inside Diameter Temper Bead

AREVA offers the ONLY proven approach for remotely operated repair of CRDM and CET nozzles that addresses all flaw scenarios utilizing our remote Inside Diameter Temper Bead (IDTB) repair.

The IDTB repair addresses all PWSCC flaw scenarios and provides a new pressure boundary weld with PWSCC-resistant material — superior to the overlay repair which leaves embedded flaws in the material and has led to rework.

Background

History has shown that leakage occurs through flaws in the partial penetration attachment weld between the RVH and CRDM nozzle as well as through the CRDM nozzle wall in Alloy 600 nozzles. The flaws, identified as PWSCC in the weld and nozzle, are repaired using an AREVA developed a technique that utilizes remotely operated automated equipment to reduce the extensive time and dose resulting from performing manual repairs. The IDTB weld repair has been implemented on 137 of the 180 nozzles repaired since December 2000, including Westinghouse, CE and B&W plants and is readily applicable to your plant.

Highlights of the AREVA Repair Process

  • Thermal Sleeve Removal (If Applicable)
  • Roll Nozzle in Repair Region
  • Machine Weld Prep & PT Weld Area
  • Perform Ambient Temperature Temper Bead Structural Weld
  • Prepare Welded Surface For NDE
  • Perform Post-Repair UT & PT
  • Remediate Rolled and Repaired Areas
  • Install Replacement Thermal Sleeve (If Required)

Features & Benefits

  • The ONLY repair that addresses all PWSCC flaw scenarios
  • Moves highly stressed attachment weld to a region with no PWSCC degradation or flaws
  • Requires much less weld volume than other repair approaches, minimizing risk & schedule
  • Remote delivery and application of tooling reduces personnel exposure
  • Geometry is symmetric which offers improved weldability and inspectability characteristics
  • Maximizes repair life with surface remediation of the original nozzle remnant, the new weld, and the HAZ
  • Does not leave embedded flaw in material
  • Does not require pre-weld or post-weld heat treatment
  • Has been approved many times by the U.S. Nuclear Regulatory Commission through relief request submittal

Highlights of the AREVA Repair Process

• Thermal Sleeve Removal (If Applicable)

• Roll Nozzle in Repair Region

• Machine Weld Prep & PT Weld Area

• Perform Ambient Temperature Temper Bead Structural Weld

• Prepare Welded Surface For NDE

• Perform Post-Repair UT & PT

• Remediate Rolled and Repaired Areas

• Install Replacement Thermal Sleeve (If Required)

AREVA has never had to perform a repair at a subsequent outage on an IDTB location

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Contact Us

Lisa Hawkins
Business Development Manager, CR&R
Tel: 434.832.2858