Tube/AVB (antivibration bar) gap measurement

Conference · Wed Nov 01 00:00:00 EST 1989 · Transactions of the American Nuclear Society; (United States)

OSTI ID:5421120

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1. Framatome, Lyon (France)

Design studies and plant operating experiences have demonstrated that excessive antivibration bar (AVB)-to-tube gap values can lead to unacceptable tube wear and may cause a utility to plug tubes and even replace the ABVs. The AVB-to-tube gap measurement will provide data that will allow: (1) checking the steam generator as-constructed clearances to predetermine the potential weak risk, (2) preventive maintenance planning, (3) gap reduction verification after replacing the AVBs, and (4) verification of the actual location of AVBs relative to the small U-bends. To measure these gaps for an estimate of the potential wear risk, Framatome has developed a unique and proprietary eddy-current technique using a rotating coil probe. This technique has been successfully implemented in several nuclear power plants. The paper provides a technical description, including selection of the tubes, and measurement accuracy, and discusses results and evaluation report, and installations.

• OSTI ID: 5421120
• Report Number(s): CONF-891103-; CODEN: TANSA; TRN: 91-024613
• Journal Information: Transactions of the American Nuclear Society; (United States), Vol. 60; Conference: Winter meeting of the American Nuclear Society (ANS) and nuclear power and technology exhibit, San Francisco, CA (United States), 26-30 Nov 1989; ISSN 0003-018X
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
PWR TYPE REACTORS
STEAM GENERATORS
MECHANICAL VIBRATIONS
SUPPORTS
EDDY CURRENT TESTING
PLANNING
PROBES
REACTOR MAINTENANCE
SPECIFICATIONS
VERIFICATION
WEAR
BOILERS
ELECTROMAGNETIC TESTING
MAINTENANCE
MATERIALS TESTING
MECHANICAL STRUCTURES
NONDESTRUCTIVE TESTING
REACTORS
TESTING
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200* - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled