Bränslets beteende i den natriumkylda snabbreaktorn ASTRID

Tidsperiod: 2015-01-01 till 2016-12-31

Projektledare: Staffan Jacobsson Svärd

Medarbetare: Ane Håkansson, Carl Hellesen, Peter Jansson

Finansiär: Vetenskapsrådet

Bidragstyp: Projektbidrag

Budget: 2 500 000 SEK

Large international research efforts are made on Gen IV nuclear energy systems for providing long-term sustainable energy production with low carbon emission. In France, world?s first prototype GenIV sodium-cooled reactor, ASTRID, is to be deployed by 2020, and the proposed research program contributes to ensuring its safe and secure operation by assessing fuel behavior in-core and at outage from the core. Two projects are included:Failed Fuel Detection (FFD): During reactor operation, fuel cladding may occasionally fail, releasing radioactive isotopes into the coolant. Early detection of such failures is crucial to mitigate releases. The ASTRID sodium coolant requires new FFD techniques as compared to currently deployed reactors. This research comprises a unique comparative study of three promising technologies; Gamma Spectroscopy of short-lived gas isotopes, Atmospheric Pressure Ionization Mass Spectroscopy and laser-driven Cavity Ring-Down Spectroscopy.Decay Heat Assessment of MA-bearing Fuels (DHA): A fuel parameter of paramount safety importance is decay heat, governing the short- and long-term cooling needs after power shutdown. In the ASTRID reactor, high-decay-heat MA-bearing fuels will be used, for which scarce data is available. Here, their properties will be researched in irradiation experiments in the OSIRIS reactor, and a dedicated calorimeter will be constructed in combination with a high sensitivity gamma spectrometer to assess the decay heat.