IN SERVICE INSPECTION OF FATIGUE CRACKS IN 1 - 5 SCALE PWR VESSEL WITH PRESSURE CYCLES
Several In-Service Inspections have been performed with focused transducers on a mock-up of a PWR vessel all along a series of pressurization cycles. The growth of several fatigue cracks initiated from intentional defects has been monitored. Over a three year period, the reproducibility of positioning measurements remained of the order of one beam diameter. The sizing method by successive -6 dB drops has been automatized and incorporated to the data processing which allows to print directly a complete control report. Specific analysis resources have been developed, mainly for imagery, in order to improve the diagnosis. The growth of the most important defects has been observed during the inspection at 330,000 cycles of pressure. It increased after 440,000 cycles. Specific transducers optimized for cracks tips diffraction enabled to obtain detailed data on defects morphology.
Bibliographic Reference: 9TH INTERNATIONAL CONFERENCE ON NDE IN NUCLEAR INDUSTRY, TOKYO (JAPAN), APRIL, 25-28, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, POB 1907, MENTIONING PAPER EN 34134 ORA
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Record Number: 1989126106700 / Last updated on: 1989-06-01
Available languages: en