Steam-generator U-bend eddy-current NDE. Final report. [PWR]

Technical Report · Fri Apr 01 00:00:00 EST 1983

OSTI ID:6278158

Brown, S

The objectives of the project were to (1) evaluate an eddy current bobbin-coil method for estimating the ovality of Row 1 U-bend opposite-side transitions and (2) evaluate conventional bobbin-coil and alternate pancake-array probe eddy current inspection methods for detection of primary-side cracking in Westinghouse Series 51 steam generator Row 1 U-bends. Twenty-two Row 1 U-bends were obtained from Westinghouse Specialty Metals Division. The bends had opposite-side transition with various degrees of tube ovality. EDM notches were placed in the bends near the transition region to evaluate eddy current crack detection capability. Little correlation was observed between eddy current signal amplitude and opposite-side transition ovality. Bobbin-coil inspection of Row 1 U-bends for cracking is being accomplished in a low signal-to-noise ratio environment. Preliminary data acquired with a pancake coil-array shows an improvement in signal-to-noise ratio which should lead to more reliable U-bend inspection. Additional effort is required to improve array-coil ruggedness for field application.

• Research Organization: Jones (J.A.) Applied Research Co., Charlotte, NC (USA)
• OSTI ID: 6278158
• Report Number(s): EPRI-NP-3010; ON: DE83902287
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
EDDY CURRENT TESTING
PWR TYPE REACTORS
STEAM GENERATORS
TUBES
DEFORMATION
ACCURACY
PERFORMANCE
BOILERS
ELECTROMAGNETIC TESTING
MATERIALS TESTING
NONDESTRUCTIVE TESTING
REACTORS
TESTING
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200* - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled