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Effect of hydrogen gas and leaching solution on the fast release of fission products from two PWR fuels

Mennecart, T. ; Iglesias, L. ORCID iD icon 1; Herm, M. ORCID iD icon 1; König, T. ORCID iD icon 1; Leinders, G.; Cachoir, C.; Lemmens, K.; Verwerft, M.; Metz, V. ORCID iD icon 1; González-Robles, E.; Meert, K.; Vandoorne, T.; Gaggiano, R.
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

To study the dissolution of UOX spent nuclear fuel in a deep geological environment and the fast release of a selection of relevant radionuclides for long-term safety of this high level waste, leaching experiments were performed with spent nuclear fuel samples originating from the pressurized water reactors (PWRs) Tihange 1 and Gösgen with a similar burnup (50 – 55 MWd.kgHM−1) but different irradiation histories. Six experiments were conducted to investigate the effect of two critical parameters: (1) the highly alkaline environment caused by the presence of cementitious materials in the “Supercontainer design”, which is currently the reference design for the long-term management of the high-level nuclear waste forms in Belgium, and (2) the reducing conditions imposed by the presence of hydrogen from the corrosion of iron-based materials present in the engineered barriers. The experiments were performed using autoclaves under pressure from 1 to 40 bar with a pure Ar atmosphere or a mixture of H2/Ar. Divided into two consecutive phases, the total experimental duration was about 1400 days. The Phase I provided mainly information about the fast release of the fission products while the perspective of the Phase II was to study the long-term evolution of the spent fuel matrix. ... mehr


Preprint §
DOI: 10.5445/IR/1000163843
Veröffentlicht am 07.11.2023
Originalveröffentlichung
DOI: 10.1016/j.jnucmat.2023.154811
Scopus
Zitationen: 5
Dimensions
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2023
Sprache Englisch
Identifikator ISSN: 0022-3115
KITopen-ID: 1000163843
Erschienen in Journal of Nuclear Materials
Verlag Elsevier
Seiten Art.-Nr.: 154811
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Scopus
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