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Validation of constraint-based assessment methodology in structural integrity

Objective

At present, there is a disparity between the characteristics measured on nuclear reactor components and test specimens. In particular, in the pattern of crack-tip stresses and strains causing plastic flow and fracture (the so-called constraint effect). Crack-tip constraint in components is generally lower than in test specimens and effective toughness is correspondingly higher. The toughness measured on standard test specimens is therefore likely to underestimate that exhibited by cracks in components. The purpose of this project is to develop and validate, by an iterative process of experiment and analysis, innovative procedures for assessing possible states of crack-tip constraint in ageing nuclear pressure boundary components.

This will provide nuclear plant operators and regulators with:
(i) improved predictions of safety margins under normal and abnormal conditions, using a validated defect assessment methodology;
(ii) improved lifetime extension arguments.

Call for proposal

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Coordinator

SERCO LTD
Address
The Quadrant 404, Birchwood Park
WA3 6AT Warrington
United Kingdom

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Participants (12)

AEA TECHNOLOGY PLC
United Kingdom
Address
329,harwell 329
OX11 0QJ Didcot,harwell,chilton

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BRITISH NUCLEAR FUELS PLC
United Kingdom
Address
Hinton House, Risley
WA3 6AS Warrington

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COMMISSARIAT A L'ENERGIE ATOMIQUE
France
Address
Dmt/semt/lisn, Batiment 607
91191 Gif Sur Yvette

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COMMISSION OF THE EUROPEAN COMMUNITIES
Netherlands
Address
Westerduinweg 3
1755 ZG Petten

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E.ON KERNKRAFT GMBH
Germany
Address
Tresckowstraße 5
Hannover

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ELECTRICITE DE FRANCE
France
Address
1,avenue Du General De Gaulle 1
92141 Clamart

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FRAMATOME ANP GMBH
Germany
Address
Freyeslebenstrasse 1
91058 Erlangen

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NUCLEAR RESEARCH INSTITUTE REZ A.S.
Czechia
Address
Rez 130
250 68 Rez - Praha

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OAK RIDGE NATIONAL LABORATORY
United States
Address
Bear Creek Road
37831-8063 Oak Ridge

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SOCIETE FRAMATOME
France
Address
Tour Framatome
92084 Paris La Defense

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TECHNICAL RESEARCH CENTRE OF FINLAND
Finland
Address
3,kemistintie 3
02044 Espoo

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UNIVERSITAET STUTTGART
Germany
Address
Pfaffenwaldring 32
70569 Stuttgart

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