Community Research and Development Information Service - CORDIS

Abstract

The assessment of material ageing requires normally extensive destructive testing by using different kind of testing and samples. A non-destructive determination of the embrittlement state would extend the usefulness of the surveillance material by reducing the material used for destructive studies and would benefit surveillance programs having an insufficient amount of available test material, and ultimately allowing tests to be performed directly on the component to evaluate.

Therefore there is a need for developing techniques that allow an early detection of micro-structural changes due to embrittlement. In the particular case of nuclear power plants the effect of the neutron irradiation in the beltline area of the reactor pressure vessel should be assessed. Non destructive methods capable of identifying the level of irradiation embrittlement should be the most desirable. Such NDE capabilities would provide substantial early warning of component deterioration and enable utilities to optimise their operating and maintenance practices, resulting in reduced costs and increased asset utilisation.

There is not only the requirement of damage detection capability, but also the need of improving the non-destructive systems in the sense of simplicity of operation, speed and accuracy of the measurement, and of course commercial prizes. Another important feature needing more research on non-destructive evaluation is the possibility of forecasting the material degradation on the basis of the actual material condition. At first instance, relationships between the ageing conditions (temperature, time, irradiation influence, etc), the material properties and the results of non- destructive analysis must be computed. Afterwards embrittlement trend curves similar to those produced for destructive testing (i.e. those provided in the Regulatory Guides of NRC) should be developed. ed.

Additional information

Authors: ACOSTA B, JRC, Institute for Advanced Materials, Petten (NL);DEBARBERIS L, JRC, Institute for Advanced Materials, Petten (NL);PERLADO J.M, Instituto de Fusi¾n Nuclear (DENIM), E.T.S.I.I, Universidad PolitÚcnica de Madrid JosÚ Gutierrez Abascal Madrid (ES)
Bibliographic Reference: An oral report given at the: CONE 9 Conference. Organised by: ASME, SFEN, JSME. Held in: Nice (FR), 8-12 April, 2001
Record Number: 200013345 / Last updated on: 2001-06-27
Category: PUBLICATION
Original language: en
Available languages: en