AREVA Improves Accuracy of Non-destructive Examination with 3-D Modeling
October 06, 2016
CHARLOTTE, N.C., October 6, 2016 – AREVA NP recently completed the nuclear industry’s first non-destructive examination (NDE) of reactor vessel nozzles using a new phased array ultrasonic (UT) technique with 3-D modeling capabilities at Unit 3 of Dominion’s Millstone Power Station in Waterford, Conn.
This new technique provides the most accurate way to measure flaw depth if service-induced flaws are detected during periodic ultrasonic examinations of reactor vessel nozzle welds. It generates a custom model of the inside of a component’s surface, allowing inspectors to more accurately evaluate welds in the primary nozzles in pressurized water reactors. With the addition of 3-D modeling and the ability to compensate for component surface irregularities, this new generation of phased array technology provides results in significantly reduced examination times.
“AREVA’s successful deployment of this first-of-a-kind technique will reduce cost, time and dose while enhancing operational excellence and inspection accuracy,” said Craig Ranson, senior vice president of Installed Base Services at AREVA Inc. “This technology is the result of a multi-year research and development effort, and our team’s dedication to innovation.”
This technique has achieved the industry’s lowest root-mean-square error (RMSE) flaw depth sizing accuracy, which satisfies the flaw depth sizing threshold requirements developed by the American Society of Mechanical Engineers, and contained in Code Cases N-695-1 and N-696-1.