United States Nuclear Regulatory Commission - Protecting People and the Environment

A Comparison of Three Round Robin Studies on ISI Reliability of Wrought Stainless Steel Piping (NUREG/CR-6795)

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Publication Information

Manuscript Completed: September 2002
Date Published: February 2003

Prepared by:
P. G. Heasler, S. R. Doctor

Pacific Northwest National Laboratory
Richland, WA 99352

D. A. Jackson, NRC Project Manager

NRC Job Code Y6604

Prepared for:
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

The Pacific Northwest National Laboratory (PNNL) is conducting a multi-year program sponsored by the Nuclear Regulatory Commission (NRC) to address issues related to the reliability of ultrasonic testing (UT) and the development of improved programs for inservice inspection (ISI). This includes establishing the accuracy and reliability of UT methods for ISI of light water reactor components. From 1981 through 1990, three major round robin studies were conducted to quantify the capability of ISI inspectors to detect cracks in wrought stainless steel, and their accuracy in crack sizing. This report concentrates on analysis techniques to estimate comparable ISI detection and sizing statistics from the three round robins. This analysis provides a tool for evaluating the effect of technological advances in UT capability during the 1980s, and to assess combining the data from the three studies to form a better overview of inspection performance.

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