Evaluation of ultrasonic techniques for detection of stress-corrosion cracks in stainless steel piping. Key Phase report
Ultrasonic pulse-echo techniques for detecting intergranular stress-corrosion cracking in 102-, 254-, and 660-mm Type 304 stainless steel Schedule 80 piping are evaluated. The effectiveness of a variety of ultrasonic transducers is compared. Transducers with varying frequency, size, and beam angle were used. Focused, nonfocused, and single- and dual-angle-beam transducers were also tested. In addition, curved and flat transducer wedges were compared. Artificial reflectors of varying size and orientation were employed in both welded and unwelded pipes to establish flaw-detection reliability and sensitivity. Data from welded pipe sections with laboratory-grown and field-induced intergranular cracks are also presented. Some statistical data for establishing the probability of detection of small reflectors are presented for artificial reflectors in 102-mm pipes and small stress-corrosion cracks in 254-mm pipes. Problems associated with spurious ultrasonic signals resulting from weld geometry are discussed.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6698180
- Report Number(s):
- EPRI-NP-761; TRN: 78-017383
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BWR TYPE REACTORS
PIPES
REACTOR MATERIALS
ULTRASONIC TESTING
STRESS CORROSION
STAINLESS STEEL-304
EVALUATION
CRACKS
EFFICIENCY
TRANSDUCERS
WELDED JOINTS
ACOUSTIC TESTING
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS
MATERIALS TESTING
NICKEL ALLOYS
NONDESTRUCTIVE TESTING
REACTORS
STAINLESS STEELS
STEELS
TESTING
WATER COOLED REACTORS
WATER MODERATED REACTORS
420500* - Engineering- Materials Testing
360105 - Metals & Alloys- Corrosion & Erosion
210100 - Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled