Community Research and Development Information Service - CORDIS

FP5

Limit strains for severe accident conditions

Project ID: FIKS-CT-1999-00012
Funded under: FP5-EAECTP C

Abstract

The local failure strains of essential reactor vessel components are investigated. The size influence of the components is of special interest. Typical severe accident conditions including elevated temperatures and dynamic loads are considered.
The main part of work consists of test families with specimens under uniaxial and biaxial static and dynamic loads. Within one test family the specimen geometry and the load conditions are similar, the temperature is the same; but the size is varied up to reactor dimensions. Special attention is given to geometries with a hole or a notch causing nonuniform stress and strain distributions typical for reactor components.
The applicability of the results can be extended to other geometries and load conditions by using recommended theoretical models. However, in any case, care must be taken when the stress triaxiality is higher than in the tested specimens. In this case the failure strain may decrease significantly. Application of the proposed limit strains to selected severe accident problems shows that the admissible load increases by a factor between 1.25 and about 2.0 in comparison to using state-of-the-art rules.

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Record Number: 6162 / Last updated on: 2004-08-25
Category: PROJ