Community Research and Development Information Service - CORDIS

Structural integrity analysis of light water reactor pressure vessels

The European Commission, DG XI, has published an open invitation to tender for the provision of a compendium of pressure vessel steels and weldments properties and of data required for structural integrity analysis.

The intention of this study is to define and collect relevant mechanical-properties data needed for structural integrity analysis fracture for light water reactor (LWR) pressure vessels with a view to making recommendations for the harmonization of current codes and standards. It should also establish guidelines for taking into account in-service degradation of material properties and formulate rules for their eventual insertion into standards.

The contents of the study should include:

- Definition and collection of thermal elastic and tensile material property data, and identification of reference fracture toughness parameters given in current design codes, both for KIC initiation toughness reference curves and for tearing resistance of pressure vessel steels, in the 20C - 350C temperature range;

- An analysis of "state-of-the-art" developments in fracture toughness parameters and testing methodology in order to update oldest data and to define the optimum fracture toughness parameters and data treatment procedures to derive reference toughness values appropriate for structural integrity analyses.

This study has been identified, by DG XI's Working Group on Codes and Standards (WGCS), as a priority within the 1995 programme.

Tenderers must have a demonstrable background in nuclear power plant 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 materials and the codes and standards applicable to reactor pressure vessel components. The organization proposed by tenderers should encompass a main contractor and selected subcontractors, representing several EU countries with interest in the nuclear field, in order to encourage a European consensus on reactor pressure vessel materials aspects and associated codes and standards.
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