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Proposals for Fellowships Title Description Accident testing of HTR fuel by Cannabisrapper


                              Proposals for Fellowships

Title                     Accident testing of HTR fuel elements

Description               The high-temperature gas-cooled reactors (HTR) are based on multilayer
                          coated fuel particles (CP), which act as barrier against fission product
                          release. HTR fuel consists of CPs embedded in graphite pebbles or blocks.
                          As part of the fuel safety analysis, HTR fuel elements will be tested under
                          high-temperature and/or oxidizing conditions to simulate accident scenarios.
                          After these tests, the integrity of the coated particles will be examined.

                          The cold finger apparatus (KüFA) installed in a hot cell will be used to
                          investigate the high-temperature behaviour of irradiated fuel elements
                          available in ITU. In parallel, oxidation tests of non-irradiated graphite and
                          other relevant compounds will be performed using a special furnace
                          (KORA). The samples will be heated to typical operating temperatures and
                          their behaviour under oxygen and water vapour ingress as well as
                          temperature excursions will be studied.

                          In the last part of the experimental programme, coated particles will be
                          examined by an irradiated-microsphere gamma analyser (IMGA). Using γ-
                          spectroscopy, this device can determine whether a CP’s coating has failed.
                          Selected failed and intact particles will be examined by ceramographic and
                          microanalytical techniques (e.g., EPMA) to determine key features affecting
                          the resistance or failure of CPs under simulated accident conditions.

                          The project will involve some modelling studies with existing codes in order
                          to understand the release mechanisms and the oxidation kinetics.

Type of traineeship       Cat 20/30

Duration of traineeship

Required skills or        The candidate should have a university degree (or a PhD) in
qualifications            nuclear or mechanical engineering, materials science,
                          chemistry or physics. In addition to a solid academic
                          background, the project requires a person with good hands-on,
                          self-organization and initiative skills, ability to liaise with the
                          technical workshop and experience in working on radioactive

Unit                      E.02 Hot Cells
Action                    52301 Safety of Advanced Nuclear Fuel
Supervisor                A. Kellerbauer


Reference                 will be completed by MSU-HR

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