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Secure a Jammed Fuel Assembly – Emergent Solution

Assessment and refurbishment of fuel pins to prevent misalignment or jamming

Upper Internals Fuel Pin Repair & Replacement

The Challenge

During refueling outages, handling operations on the upper internals may cause impacts on the fuel pins that result in subsequent misalignment or jamming of the fuel assembly.

The Solution

Based on extensive experience in upper internals work, AREVA provides a full package to repair and — if the damage is too great — to replace fuel pins.

The Leader in Upper Internals Work

  • Experience on different types of plants in the U.S. and France, with 12 operations over the last 30 years
  • Continuous training of our experts, engineers and operators in order to be immediately operational
  • Intensive R&D program over the last few years to develop updated tools with new technologies
  • Dose optimization as work performed with standard water level

Technical Features

  • Underwater work performed from below the upper internals while they are on the stand
  • Assessment by:
    — Televisual inspection
    — Checking the angle of the pins with a specific tool
  • Fuel pin refurbishment/repair by:
    — Straightening
    — Grinding
    — Electrical Discharge Machining
  • Fuel pin replacement (guide tube removal performed prior to replacement) using specific mechanical tools

Features & Benefits

  • Dose optimization by underwater work
  • Capability to propose and implement the most appropriate solution: refurbishment or replacement
  • Low impact on outage schedule due to underwater work
  • Unique worldwide experience

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)

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Contact Us

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