Ultrasonic Phased Array Evaluations Of Implanted And In-Situ Grown Flaws In Cast Austenitic Stainless Steel Pressurizer Surge Line Piping
A set of circumferentially oriented thermal fatigue cracks (TFCs) were implanted into three cast austenitic stainless steel (CASS) pressurizer (PZR) surge-line specimen welds (pipe-to-elbow configuration) that were salvaged from a U.S. commercial nuclear power plant that had not been operated. Thus, these welds were fabricated using vintage CASS materials that were formed in the 1970s. Additionally, in-situ grown TFCs were placed in the adjacent CASS base material of one of these specimens. Ultrasonic phased-array responses from both types of flaws (implanted and in-situ grown) were analyzed for detection and characterization based on sizing and signal-to-noise determination. Multiple probes were employed covering the 0.8 to 2.0 MHz frequency range. To further validate the Pacific Northwest National Laboratory (PNNL) findings, an independent in-service inspection (ISI) supplier evaluated the flaws with their American Society of Mechanical Engineers (ASME) Code, Section XI, Appendix VIII-qualified procedure. The results obtained by PNNL personnel compared favorably to the ISI supplier results. All examined flaws were detected and sized within the ASME Code-allowable limits.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1038395
- Report Number(s):
- PNNL-SA-78594; 401001060; TRN: US1201851
- Resource Relation:
- Conference: Proceedings of the ASME 2011 Pressure Vessels & Piping Division, July 17-21, 2011, Baltimore, Maryland, Paper No. PVP2011-57909
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CONFIGURATION
DEFECTS
DETECTION
ENGINEERS
FREQUENCY RANGE
IN-SERVICE INSPECTION
NUCLEAR POWER PLANTS
PERSONNEL
PRESSURE VESSELS
PRESSURIZERS
PROBES
SIZE
STAINLESS STEELS
SURGES
THERMAL FATIGUE
ULTRASONIC WAVES
Ultrasonic PA
cast stainless steel
thermal fatigue cracks