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The manufacturing of uranium nitride for possible use in light water reactors
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.ORCID iD: 0000-0002-6628-4558
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 [en]
uranium nitride, autoclave, hydrolysis, corrosion
National Category
Other Physics Topics
Research subject
Physics; Chemistry; SRA - Energy; Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-168412ISBN: 978-91-7595-617-6 (print)OAI: oai:DiVA.org:kth-168412DiVA: diva2:816319
Presentation
2015-06-08, FA31, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20150603

Available from: 2015-06-03 Created: 2015-06-03 Last updated: 2017-03-07Bibliographically approved
List of papers
1. Manufacture of fully dense uranium nitride pellets using hydride derived powders with spark plasma sintering
Open this publication in new window or tab >>Manufacture of fully dense uranium nitride pellets using hydride derived powders with spark plasma sintering
2014 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 452, no 1-3, 548-551 p.Article in journal (Refereed) Published
Abstract [en]

Applying a combination of hydriding/nitriding of metallic uranium with the spark plasma sintering technique, we show that uranium nitride pellets with an average porosity of 0.2% may be manufactured. This is considerably smaller than the lowest porosity previously reported in the literature. The high density is attained by sintering at 1650 °C for only three minutes.

Keyword
Porosity, Spark plasma sintering, Uranium compounds, Hydriding, Metallic uranium, Spark plasma sintering techniques, Uranium nitride pellets
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-161521 (URN)10.1016/j.jnucmat.2014.06.012 (DOI)000339657200078 ()2-s2.0-84903788189 (Scopus ID)
Funder
Swedish Research CouncilEU, FP7, Seventh Framework Programme
Note

QC 20150313

Available from: 2015-03-13 Created: 2015-03-12 Last updated: 2017-12-04Bibliographically approved
2. Uranium nitride fuels in superheated steam
Open this publication in new window or tab >>Uranium nitride fuels in superheated steam
(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:nbn:se:kth:diva-168417 (URN)10.1080/00223131.2017.1291372 (DOI)000399483900001 ()2-s2.0-85013469064 (Scopus ID)
Note

QC 20170111

Available from: 2015-06-03 Created: 2015-06-03 Last updated: 2017-06-08Bibliographically approved

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