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Title: Using Low-Frequency Phased Arrays to Detect Cracks in Cast Austenitic Piping Components

Abstract

As part of a multi-year program funded by the United States Nuclear Regulatory Commission (US NRC) to address NDE reliability of inservice inspection (ISI) programs, recent studies conducted at the Pacific N¬orthwest National Laboratory (PNNL) in Richland, Washington, have focused on assessing novel NDE approaches for the inspection of coarse-grained, cast stainless steel reactor components. The primary objective of this work is to provide information to the US NRC on the utility, effec¬tiveness and reliability of ultrasonic testing (UT) and eddy current testing (ET) inspection techniques as related to the ISI of primary piping components in pressurized water reactors (PWRs). This paper describes progress, recent developments and early results from an assessment of a portion of this work relating to the ultrasonic low frequency phased array inspection technique. Westinghouse Owner’s Group (WOG) cast stainless steel pipe segments with thermal and mechanical fatigue cracks, PNNL samples containing thermal fatigue cracks and several blank vintage specimens having very coarse grains that are representative of early centrifugally cast piping installed in PWRs, are being used for assessing the inspection method. The phased array approach was implemented using an R/D Tech Tomoscan III system operating at 1.0 MHz and 500 kHz, providing composite volumetricmore » images of the samples. Several dual, transmit-receive, custom designed low-frequency arrays are employed in laboratory trials. Results from laboratory studies for assessing detection of thermal and mechanical fatigue cracks in cast stainless steel piping welds are discussed. This work was sponsored by the U.S. Nuclear Regulatory Commission under Contract DE-AC06-76RLO 1830; NRC JCN Y6604; Mr. Wallace Norris, Program Monitor.« less

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
901776
Report Number(s):
PNNL-SA-47563
401001060; TRN: US0702662
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of Combined EPRI Seventh Piping and Bolting and Fourth Phased Array Inspection Conference, 12 pages
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 36 MATERIALS SCIENCE; DETECTION; EDDY CURRENT TESTING; EPRI; FASTENING; PWR TYPE REACTORS; REACTOR COMPONENTS; RELIABILITY; STAINLESS STEELS; THERMAL FATIGUE; ULTRASONIC TESTING; ULTRASONIC WAVES; US NRC; Low-Frequency; Ultrasonic; Phased Array; Cast Stainless Piping

Citation Formats

Anderson, Michael T., Cumblidge, Stephen E., and Doctor, Steven R. Using Low-Frequency Phased Arrays to Detect Cracks in Cast Austenitic Piping Components. United States: N. p., 2005. Web.
Anderson, Michael T., Cumblidge, Stephen E., & Doctor, Steven R. Using Low-Frequency Phased Arrays to Detect Cracks in Cast Austenitic Piping Components. United States.
Anderson, Michael T., Cumblidge, Stephen E., and Doctor, Steven R. Fri . "Using Low-Frequency Phased Arrays to Detect Cracks in Cast Austenitic Piping Components". United States. doi:.
@article{osti_901776,
title = {Using Low-Frequency Phased Arrays to Detect Cracks in Cast Austenitic Piping Components},
author = {Anderson, Michael T. and Cumblidge, Stephen E. and Doctor, Steven R.},
abstractNote = {As part of a multi-year program funded by the United States Nuclear Regulatory Commission (US NRC) to address NDE reliability of inservice inspection (ISI) programs, recent studies conducted at the Pacific N¬orthwest National Laboratory (PNNL) in Richland, Washington, have focused on assessing novel NDE approaches for the inspection of coarse-grained, cast stainless steel reactor components. The primary objective of this work is to provide information to the US NRC on the utility, effec¬tiveness and reliability of ultrasonic testing (UT) and eddy current testing (ET) inspection techniques as related to the ISI of primary piping components in pressurized water reactors (PWRs). This paper describes progress, recent developments and early results from an assessment of a portion of this work relating to the ultrasonic low frequency phased array inspection technique. Westinghouse Owner’s Group (WOG) cast stainless steel pipe segments with thermal and mechanical fatigue cracks, PNNL samples containing thermal fatigue cracks and several blank vintage specimens having very coarse grains that are representative of early centrifugally cast piping installed in PWRs, are being used for assessing the inspection method. The phased array approach was implemented using an R/D Tech Tomoscan III system operating at 1.0 MHz and 500 kHz, providing composite volumetric images of the samples. Several dual, transmit-receive, custom designed low-frequency arrays are employed in laboratory trials. Results from laboratory studies for assessing detection of thermal and mechanical fatigue cracks in cast stainless steel piping welds are discussed. This work was sponsored by the U.S. Nuclear Regulatory Commission under Contract DE-AC06-76RLO 1830; NRC JCN Y6604; Mr. Wallace Norris, Program Monitor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 30 00:00:00 EST 2005},
month = {Fri Dec 30 00:00:00 EST 2005}
}

Conference:
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