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Abstract

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.

Additional information

Authors: GONDARD G, CEA, SACLAY (FRANCE);JRC ISPRA ESTAB. (ITALY);LUCIA A C, CEA, SACLAY (FRANCE);JRC ISPRA ESTAB. (ITALY);ELBAZ J CEA, SACLAY (FRANCE), CEA, SACLAY (FRANCE);JRC ISPRA ESTAB. (ITALY);JRC ISPRA ESTAB. (ITALY), CEA, SACLAY (FRANCE);JRC ISPRA ESTAB. (ITALY)
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
Availability: Can be ordered online
Record Number: 1989126106700 / Last updated on: 1989-06-01
Category: PUBLICATION
Available languages: en
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