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Title: Assessment of Crack Detection in Cast Austenitic Piping Components Using Advanced Ultrasonic Methods.

Abstract

Studies conducted at the Pacific N¬orthwest National Laboratory (PNNL) in Richland, Washington, have focused on developing and evaluating the reliability of nondestructive examination (NDE) approaches for inspecting coarse-grained, cast stainless steel reactor components. The objective of this work is to provide information to the United States Nuclear Regulatory Commission (NRC) on the utility, effec¬tiveness and limitations of ultrasonic testing (UT) inspection techniques as related to the in-service inspec¬tion of primary system piping components in pressurized water reactors (PWRs). Cast stainless steel pipe specimens were examined that contain thermal and mechanical fatigue cracks located close to the weld roots and have inside/outside surface geometrical conditions that simulate several PWR primary piping configurations. In addition, segments of vintage centrifugally cast piping were also examined to understand inherent acoustic noise and scattering due to grain structures and determine consistency of UT responses from different locations. The advanced UT methods were applied from the outside surface of these specimens using automated scanning devices and water coupling. The low-frequency ultrasonic method employed a zone-focused, multi-incident angle inspection protocol (operating at 250-450 kHz) coupled with a synthetic aperture focusing technique (SAFT) for improved signal-to-noise and advanced imaging capabilities. The phased array approach was implemented with amore » modified instrument operating at 500 kHz and composite volumetric images of the specimens were generated. Re¬sults from laboratory studies for assessing detection, localization and sizing effectiveness are discussed in this paper.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
962032
Report Number(s):
PNNL-SA-49933
401001060; TRN: US0903530
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the 5th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components, 1058-1070
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 36 MATERIALS SCIENCE; ACOUSTICS; APERTURES; DETECTION; FOCUSING; IN-SERVICE INSPECTION; PWR TYPE REACTORS; REACTOR COMPONENTS; RELIABILITY; SCATTERING; SIZE; STAINLESS STEELS; ULTRASONIC TESTING; ULTRASONIC WAVES; Crack Dectection; Piping Components; Ultrasonic; Nuclear

Citation Formats

Anderson, Michael T., Crawford, Susan L., Cumblidge, Stephen E., Diaz, Aaron A., and Doctor, Steven R.. Assessment of Crack Detection in Cast Austenitic Piping Components Using Advanced Ultrasonic Methods.. United States: N. p., 2007. Web.
Anderson, Michael T., Crawford, Susan L., Cumblidge, Stephen E., Diaz, Aaron A., & Doctor, Steven R.. Assessment of Crack Detection in Cast Austenitic Piping Components Using Advanced Ultrasonic Methods.. United States.
Anderson, Michael T., Crawford, Susan L., Cumblidge, Stephen E., Diaz, Aaron A., and Doctor, Steven R.. Mon . "Assessment of Crack Detection in Cast Austenitic Piping Components Using Advanced Ultrasonic Methods.". United States. doi:.
@article{osti_962032,
title = {Assessment of Crack Detection in Cast Austenitic Piping Components Using Advanced Ultrasonic Methods.},
author = {Anderson, Michael T. and Crawford, Susan L. and Cumblidge, Stephen E. and Diaz, Aaron A. and Doctor, Steven R.},
abstractNote = {Studies conducted at the Pacific N¬orthwest National Laboratory (PNNL) in Richland, Washington, have focused on developing and evaluating the reliability of nondestructive examination (NDE) approaches for inspecting coarse-grained, cast stainless steel reactor components. The objective of this work is to provide information to the United States Nuclear Regulatory Commission (NRC) on the utility, effec¬tiveness and limitations of ultrasonic testing (UT) inspection techniques as related to the in-service inspec¬tion of primary system piping components in pressurized water reactors (PWRs). Cast stainless steel pipe specimens were examined that contain thermal and mechanical fatigue cracks located close to the weld roots and have inside/outside surface geometrical conditions that simulate several PWR primary piping configurations. In addition, segments of vintage centrifugally cast piping were also examined to understand inherent acoustic noise and scattering due to grain structures and determine consistency of UT responses from different locations. The advanced UT methods were applied from the outside surface of these specimens using automated scanning devices and water coupling. The low-frequency ultrasonic method employed a zone-focused, multi-incident angle inspection protocol (operating at 250-450 kHz) coupled with a synthetic aperture focusing technique (SAFT) for improved signal-to-noise and advanced imaging capabilities. The phased array approach was implemented with a modified instrument operating at 500 kHz and composite volumetric images of the specimens were generated. Re¬sults from laboratory studies for assessing detection, localization and sizing effectiveness are discussed in this paper.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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