Objective
A crucial problem in several industrial processes is the fabrication of crucibles for melting large masses of metallic materials. These crucibles have to resist at very high temperatures (up to 2000 C) for long time (a few hours) and due to high cost they have to be used a number of times. A solution to this problem is essential also for extending the capability of the JRC facilities FARO and KROTOS used for the study of severe accidents in nuclear reactors as well as for processes related to waste treatment. The following topics are considered:
Tests with a large amount of corium are planned in FARO to study ex-vessel severe accident problems in NPPS. In addition to the uranium dioxide and zirconium dioxide ceramics, metallic composites (stainless steel, zirconium) are included in the corium. The problem to be solved is the melting of large masses (up to 200 kg) of these metallic materials in a crucible which has to resist at approximately 2000 C for a relatively long time.
For metal fuelled research reactors it is also important to investigate the behaviour of metallic melts in case of severe accidents. Tests could be performed in KROTOS where triggered steam explosions with high temperature metallic melts (aluminium, zirconium, uranium) and water can be performed. Again there is a problem for the identification and fabrication of the crucible.
Detritiation and compaction of solid wastes before their storage or disposal, in particular the waste coming from exhausted boron carbide control rods used in BWRs. A possible process is first to chemically decompose the boron carbide to ensure the complete removal of tritium and then to melt the eutectic alloys formed by boron carbide, stainless steel and structural materials.
The extension of FARO and KROTOS would also increase the possibilities of new international cooperations and third party work with national organizations.
Melting experiments with metal masses in crucibles of various materials (magnesium oxide, zirconium oxide, etc) using existing furnaces (maximum temperatures: 2500 C).
Post-test examination and metallographic analysis of material compatibilities.
Realization of a crucible for MF-melting of a 50 kg mixture of stainless steel/zirconium, which may be installed in the existing furnace.
Realization of a special crucible (for some kg of metallic melt) which allows the rupture of its bottom for melt release as requested by the KROTOS test tube configuration.
Coupling of the MF furnace to the FARO plant. Execution of KROTOS experiments. Study, design and fabrication of larger melting plants for FARO (200 kg) and waste treatment (up to 1000 kg).
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Programme(s)
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Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Coordinator
21020 Ispra
Italy
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.