Stress Corrosion Cracking (SCC) as a result of excessive tensile stress is a recognized problem which can compromise nuclear plant safety and availability. MSIP® (Mechanical Stress Improvement Process) is a patented, permanent solution for mitigating SCC in Nuclear Plant piping weldments.

MSIP® is accepted by the United States Nuclear Regulatory Commission as a stress improvement process for mitigation of stress corrosion cracking in both boiling water reactor (BWR) and pressurized water reactor (PWR) plants. MSIP® is also used to prevent SCC in RBMK piping welds.

Contact: Greg Lazzaro | 412-586-1810

3D cross section of MSIP on safety nozzle

How It Works

Stress Corrosion Cracking occurs when three conditions are present:

  • Susceptible material
  • Tensile stresses
  • Harsh environment

At least one of these three contributing factors must be eliminated to mitigate SCC.

MSIP® uses a hydraulically operated clamp to contract the pipe on one side of the weldment. This removes tensile residual stress from the vulnerable area and generates a more favorable compressive stress pattern in its place. The result is prevention and permanent mitigation of SCC without the need for relief request.

Results You Can Measure

We’ve successfully applied MSIP® in plants around the world and consistently deliver predictable, verifiable results.

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Years in Operation
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Welds Squeezed
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New Cracks in Treated Welds
stress corrosion cracking project locations

MSIP® Applications in PWRs

MSIP applications on PWR

MSIP® Applications in BWRs

MSIP applications on BWRs

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