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NuVision Engineering and Westinghouse Apply MSIP to Reactor Vessel Nozzles at Salem Unit 1


NuVision Engineering and Westinghouse Electric Company have applied Mechanical Stress Improvement Process (MSIP®) to the reactor vessel inlet and outlet nozzles at Public Service Electric and Gas (PSE&G) Nuclear, LLC's Salem Nuclear Generating Station Unit 1 in Salem, N.J. The team successfully completed the MSIP® work in substantially less time than would have been required for alternative techniques.

MSIP®, developed and owned by NuVision Engineering, is a mechanical process that permanently prevents or mitigates stress corrosion cracking in piping and welds containing Alloy 600 by generating a compressive stress pattern from the pipe inside surface to more than halfway through the wall thickness. NuVision and Westinghouse are exclusively partnered to offer this technology to utilities with pressurized water reactors.

PSE&G chose MSIP® as its preferred mitigation technique due to its simplicity of application, obvious schedule and dose benefits, and regulatory acceptance of the technology to mitigate stress corrosion cracking of pipe systems.

PSE&G project manager Brian Gustems and his team worked closely with NuVision and Westinghouse during preparation for and implementation of this project. "We had the challenges of a first-time evolution, but that did not keep us from meeting all our goals for the project and our commitments to the outage."

MSIP® was applied to mitigate stress corrosion cracking of the nozzle-to-safe-end welds on all eight reactor vessel nozzles, in response to the MRP-139 requirements developed by EPRI. The implementation schedule was a total of six days: from completion of pre-mitigation Performance Demonstration Initiative (PDI) ultrasonic testing (UT) to completion of post-mitigation PDI UT on the last nozzle, using an outside diameter (OD) surface-applied ultrasonic inspection technique. MSIP® was applied to two nozzles at a time, and the work was completed ahead of schedule with no injuries or re-work.

NuVision and Westinghouse are scheduled to perform MSIP® on the eight reactor vessel nozzles at Salem Unit 2 during the Fall, 2009 outage, as well as Exelon's Byron Units 1 and 2, and Braidwood Units 1 and 2 between 2011 and 2013.

For more information, contact Brian Beley at 412-760-6500 or

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