JRP CALL information
Supported By

European Commission

Short description of the work
The aim of the study is to obtain new experimental data on the high temperature behaviour of crucial systems involved in a nuclear reactor severe accident. The U-Zr-O and Fe-Zr-O systems were studied using the laser heating setup at ITU. Three samples within the U-Zr-O system and six samples within the Fe-Zr-O system were investigated. A need of data exists especially in the oxygen-poor region of the aforementioned systems. The samples were heated using a Nd:YAG laser above the melting point using different experimental atmospheres (compressed air and argon). The laser was then switched off and the samples quenched to ambient temperature. Several cycles of heating-cooling were used in order to have a good statistics and to test the reproducibility of the results. Using a pyrometer working at 650 nm the radiance temperature was measured. In parallel a 256-channel spectrometer working between 450-1000 nm was used to obtain an estimation of the emissivity of the samples. A clear effect of the experimental atmosphere on the melting results was observed. In fact, especially when Fe and Zr-containing samples are concerned, the oxygen potential of the buffer gas may drive an overwhelming oxidation of the samples.
Part of the post-experiment analyses (SEM-EDS, XRD) will be performed at ITU. The Fe-Zr-O samples will be analysed at the CEA Saclay using the same techniques.
The measured transition temperatures will be used for a thermodynamic modelling of the investigated systems using the CALPHAD method. The thermodynamic reassessment of these systems will be then integrated to the TAF-ID thermodynamic database for the description of the in-vessel corium formed during a severe accident in a nuclear reactor.

Main visitor contact data
Name: Andrea Quaini
Organisation: INP-Grenoble

JRP Identification
JRP nr: TALI-C04-09
JRP title: laser heating study in the U‐Zr‐Fe‐O in‐vessel corium
JRP scope: Scope 3: Actinide materials

Visited Associated Pooled Facility
Visited APF during the stay: JRC-ITU - Labs & Hot-cells
Name of the APF Contact Person: Dario Manara

Other APF and organisation involved in the JRP
Other organisations involved:
Other APF involved in the project:

Description of the work done at the associated pooled facility
Start date of the stay: 1/26/2015
End date of the stay: 2/5/2015
Quantity of access: 10
Access Unit: Days