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Uranium nitride fuels in superheated steam
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.ORCID iD: 0000-0001-6818-5724
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.ORCID iD: 0000-0002-6082-8913
(English)In: Journal of Nuclear Science and Technology, ISSN 0022-3131, E-ISSN 1881-1248Article in journal (Refereed) Accepted
Abstract [en]

Uranium mononitride (UN) pellets of different densities were subjected to a superheatedsteam/argon mixture at atmospheric pressure to evaluate their resistance to hydrolysis. Completedegradation of pure UN pellets was obtained within 1 hour in 0.50 bar steam at 500 °C. Theidentified reaction products were uranium dioxide, ammonia and hydrogen gas, with no detectableamounts of nitrogen oxides formed. However, the reaction could not be carried to completion, andthe presence of uranium sesquinitride and higher uranium oxides or uranium oxynitrides in the solidresidue is indicated. Evolution of elemental nitrogen was seen in connection with very high reactionrates. The porosity of the pellets was identified as the most important factor determining reactionrates at 400 – 425 °C, and it is suggested that in dense pellets, cracking due to internal volumeincrease initiates a transition from slow surface corrosion to pellet disintegration. The implicationsfor the use of nitride fuels in light water reactors are discussed, with some observations concerninghydrolysis as a method for 15N recovery from isotopically enriched spent nitride fuel.

National Category
Physical Sciences
Research subject
Energy Technology; Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-168417DOI: 10.1080/00223131.2017.1291372ISI: 000399483900001Scopus ID: 2-s2.0-85013469064OAI: oai:DiVA.org:kth-168417DiVA: diva2:816339
Note

QC 20170111

Available from: 2015-06-03 Created: 2015-06-03 Last updated: 2017-06-08Bibliographically approved
In thesis
1. The manufacturing of uranium nitride for possible use in light water reactors
Open this publication in new window or tab >>The manufacturing of uranium nitride for possible use in light water reactors
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. x, 64 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2015:25
Keyword
uranium nitride, autoclave, hydrolysis, corrosion
National Category
Other Physics Topics
Research subject
Physics; Chemistry; SRA - Energy; Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-168412 (URN)978-91-7595-617-6 (ISBN)
Presentation
2015-06-08, FA31, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:00 (English)
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Supervisors
Note

QC 20150603

Available from: 2015-06-03 Created: 2015-06-03 Last updated: 2017-03-07Bibliographically approved

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Jolkkonen, MikaelWallenius, Janne

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