The effect of radiation damage by fission fragments on dissolution of spent nuclear fuel Aleksej Popel, PhD candidate Supervisor: Dr Ian Farnan Department.

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Presentation transcript:

The effect of radiation damage by fission fragments on dissolution of spent nuclear fuel Aleksej Popel, PhD candidate Supervisor: Dr Ian Farnan Department of Earth Sciences University of Cambridge 1

Content Introduction into my project Key results Relevance of the work 2

Introduction Several countries, including the UK, decided or considering direct disposal of Spent Nuclear Fuel using Geological Disposal Facilities 3

Geological Disposal It is expected that: ground water will enter the repository fuel containers and fuel cladding will be breached spent nuclear fuel will start to dissolve and radioactive nuclides will start to migrate into biosphere 4

Geological Disposal Need to know spent fuel solubility and dissolution rate to assess the extent of possible radioactive contamination: extensive research in this area but very little work on the effect of radiation damage on dissolution of spent nuclear fuel 5

My Project Aim: to study the effect of radiation damage by fission fragments on dissolution of spent nuclear fuel 6

( J. Somers) (Z. Hiezl) i) structural effects: ↑ surface area ↑ lattice strain ii) chemical effects: U(IV) → U(V) & U(VI) ? vs Fresh fuel Spent Fuel Motivation: expect ↑ of solubility: 7

Approach Use simulant fuel made out of depleted UO2 Simulate the effect of fission damage by ion irradiation at an accelerator Characterise the samples Conduct dissolution experiments 8

Key results: replication of the real spent fuel microstructure Real Spent Fuel Our effort ( J. Somers) 9

Key results: the effect of radiation damage on solubility of UO2 10

Applications Direct: supports the safety case for a UK Geological Disposal Facility Indirect: i) general better understanding of nuclear fuel dissolution in the cases of the fuel failure in: - working reactors - reactor accidents - fuel ponds ii) extension of the fuel operating life (burn-up) 11

Aleksej Popel Thanks for your attention! Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, Cambridgeshire, CB2 3EQ, United Kingdom 12

References - Cambridge University logohttp:// - Earth Sciences logohttp:// nts_square_up_over_nuclear_waste_site.html - NGR diagramhttp:// nts_square_up_over_nuclear_waste_site.html - fission diagramhttp:// J. Somers F-BRIDGE presentation – HBS photo Z. Hiezl – fresh UO2 photo 13