Evaluation of Eddy Current Reliability from Steam Generator Mock-Up Round-Robin (NUREG/CR-6785)
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Publication Information
Manuscript Completed: November 2001
Date Published: September 2002
Prepared by:
D. S. Kupperman, S. Bakhtiari, W. J. Shack,
J. Y. Park, S. Majumdar
Argonne National Laboratory
9700 South Cass Avenue
Argonne, IL 60439
J. Davis, NRC Project Manager
Prepared for:
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001
NRC Job Code W6487
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Abstract
This report presents an independent assessment of steam generator (SG) inspection reliability that was developed through a nondestructive evaluation round-robin on a steam generator mock-up at Argonne National Laboratory (ANL). The report does not establish regulatory position. The purpose of the round-robin was to assess the current state of SG tubing in-service inspection reliability, determine the probability of detection (POD) as function of flaw size or severity, and to assess the capability for sizing of flaws. Eleven teams participated in analyzing bobbin and rotating coil mock-up data collected by qualified industry personnel. The mock-up contains hundreds of cracks and simulations of artifacts such as corrosion deposits and tube support plates that make detection and characterization of cracks more difficult in operating steam generators than in most laboratory situations. An expert Task Group from industry, Argonne National Laboratory, and the NRC have reviewed the signals from the laboratory grown cracks used in the mock-up to ensure that they provide reasonable simulations of those obtained in the field. The number of tubes inspected and the number of teams participating in the round-robin are intended to provide better statistical data on the POD and characterization accuracy than is currently available EPRI qualification programs.
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