Community Research and Development Information Service - CORDIS

Re-evaluation of fatigue analysis criteria

The European Commission, DG XI, has published an open invitation to tender for a study on re-evaluation of fatigue analysis criteria. The objective of this study is to obtain, as far as is practicable, a common European understanding of fatigue analyses. The particular objectives defined by the Commission are as follows:

- To agree on a common definition of fatigue damage which takes into account the conventional approach of design codes for fatigue analyses;
- To agree on equivalent margins for fatigue evaluation of various design solutions;
- To recommend improvements to present design codes and assessment procedures.

The study should, in particular, develop the following areas:

- Re-evaluation of the S-N curve method for parent material in terms of current understanding of crack initiation and crack propagation behaviour and consideration of additional effects owing to the presence of welds;
- Re-evaluation of practices applied for fatigue analysis of crack-like discontinuities;
- Re-evaluation of plastic correction factors for pipeworks;
- Guidance on use of fatigue curves for a number of cycles larger than 106 cycles.

It should also make general recommendations for the harmonization of design procedures and parts of current codes affected by the study which should initially concentrate on the light water reactor (LWR) sector.

The study has been identified as a priority in the 1995 programme by the Working Group on Codes and Standards (WGCS) - the expert group of the "Safety of Nuclear Installations" unit of DG XI.

Tenderers must have a demonstrable background in nuclear power plant (NPP) design, construction and operation - in particular in components which are part of the reactor primary system of LWRs. Tenderers must also have demonstrable experience in the area of fatigue analysis and associated materials aspects of LWR components, including related codes and standards in the area of materials. The organization proposed by tenderers should encompass a main contractor and selected subcontractors, representing several EU countries with interest in the nuclear field. This is with a view to encouraging European consensus on reactor pressure vessel materials aspects and associated codes and standards.
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