SB-02-4(112) RUPTHER : A PROGRAMME TO UNDERSTAND THE RPV LOWER HEAD BEHAVIOUR UNDER SEVERE ACCIDENT LOADING CONDITIONS(Materials Performance in Nuclear Application 2) :

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To enhance the assessment of Reactor Pressure Vessel life under severe accident with corium flow, a co-operative research programme is conducted between the Commissariat a L'Energie Atomique (CEA), Electricite de France (EDF) and Framatome, parts of which are supported by the European Commission. In order to validate constitutive models in mechanical situations featuring the same basic characteristics as the severe accident scenarios, analytical experiments (19 tests performed) are conducted on the RUPTHER facility : a thin shell tube is loaded with an internal pressure (maximum 1OMPa) and submitted to an axial thermal gradient with elevated temperatures (maximum 1400℃). Moreover, within the framework of the RUPTHER programme, a model due to Lemaitre & Chaboche with predictive capability in the field of viscoplastic flow, material damage and failure has been generalised and implemented in CASTEM 2000 finite element code. The specific question of the interest of the coupled damage approach in the failure prediction is addressed : comparisons of the predictions relying on coupled and uncoupled damage viscoplasticity models for some of the RUPTHER creep tests are given and a discussion on the validity of the different approaches is presented.

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