The thermal stress on breeding blanket structure is one of the main design driver; consequently, an open issue for fusion power reactor is the choice of breeding blanket material. The mostly promising and worldwide-investigated solution refers to the ceramic material, e.g. Li4SiO4, in form of pebble beds instead of a bulk form such as a block or a disk. This would introduce some advantages, especially for what concerns the heat transfer phenomena, low activation characteristics, low thermal expansion coefficient, high thermal conductivity, etc. In this paper, particularly the reliability/availability of a methodology capable to produce stable and well-sized ceramic pebbles is a major challenge as well as the evaluation of the thermal conductivity, that is a necessary input data for the understanding of blanket behavior (support the thermal-structural and thermo-hydraulic analyses). As for this latter, moreover, a sample holder considering the heat transfer mechanism through the pebble-bed was duly designed such to determine the pebble-bed thermal conductivity by means of a hot rig with guard resistance method. This paper introduces (and analyses) preliminary results of the effective thermal conductivity on the pebble-bed as well as a description of the adopted methodology. This research activity was developed in the framework of PRA2016 project.

Manufacturing challenges and required R&D on fusion pebbles bed material

Rosa Lo Frano
Co-primo
Writing – Original Draft Preparation
;
Daniele Del Serra
Writing – Review & Editing
;
Monica Puccini
Co-primo
Writing – Original Draft Preparation
;
Donato Aquaro
Supervision
;
Eleonora Stefanelli
Membro del Collaboration Group
;
Sandra Vitolo
Supervision
;
Riccardo Ciolini
Writing – Review & Editing
;
Nicola Forgione
Funding Acquisition
;
Maurizia Seggiani
Membro del Collaboration Group
2017-01-01

Abstract

The thermal stress on breeding blanket structure is one of the main design driver; consequently, an open issue for fusion power reactor is the choice of breeding blanket material. The mostly promising and worldwide-investigated solution refers to the ceramic material, e.g. Li4SiO4, in form of pebble beds instead of a bulk form such as a block or a disk. This would introduce some advantages, especially for what concerns the heat transfer phenomena, low activation characteristics, low thermal expansion coefficient, high thermal conductivity, etc. In this paper, particularly the reliability/availability of a methodology capable to produce stable and well-sized ceramic pebbles is a major challenge as well as the evaluation of the thermal conductivity, that is a necessary input data for the understanding of blanket behavior (support the thermal-structural and thermo-hydraulic analyses). As for this latter, moreover, a sample holder considering the heat transfer mechanism through the pebble-bed was duly designed such to determine the pebble-bed thermal conductivity by means of a hot rig with guard resistance method. This paper introduces (and analyses) preliminary results of the effective thermal conductivity on the pebble-bed as well as a description of the adopted methodology. This research activity was developed in the framework of PRA2016 project.
978-961-6207-43-0
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/881583
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