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Transmutation of nuclear waste in gas-cooled sub-critical reactors
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , viii, 74 p.
Series
Trita-FYS, ISSN 0280-316X ; 2005:60
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-578ISBN: 91-7178-196-X (print)OAI: oai:DiVA.org:kth-578DiVA: diva2:14485
Presentation
2005-11-25, FA32, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:00
Supervisors
Note
QC 20110114Available from: 2005-12-28 Created: 2005-12-28 Last updated: 2011-01-14Bibliographically approved
List of papers
1. Source efficiency as function of fuel and coolant in accelerator-driven systems
Open this publication in new window or tab >>Source efficiency as function of fuel and coolant in accelerator-driven systems
2006 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 33, no 9, 829-832 p.Article in journal (Refereed) Published
Abstract [en]

We have studied the efficiency of spallation neutron sources for different combinations of coolant and fuel in 80 MWth, sub-critical, cores. It has been found that the proton source efficiency, psi*, is reduced by 10% when switching coolant from helium to lead-bismuth eutectic. Substituting MOX fuel with an americium based fuel, results in another 10% reduction of psi*. The relatively high source efficiencies found for prototype accelerator-driven systems, using standard MOX fuel and helium coolant, may thus be difficult to achieve in future systems dedicated to the transmutation of higher actinides. Our results are in agreement with previous investigations of the dependence of the source efficiency on the selection of coolant.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-6750 (URN)10.1016/j.anucene.2006.03.007 (DOI)000239532900010 ()2-s2.0-33745584785 (Scopus ID)
Note
Tidigare titel: Source efficiency studies in gas- and leadbismuth- cooled sub-critical accelerator-driven cores. Uppdaterad från submitted till published: 20101005. QC 20101005Available from: 2005-09-22 Created: 2005-09-22 Last updated: 2011-10-03Bibliographically approved
2. Neutronic and Safety Aspects of a Gas-Cooled Subcritical Core for Minor Actinide Transmutation
Open this publication in new window or tab >>Neutronic and Safety Aspects of a Gas-Cooled Subcritical Core for Minor Actinide Transmutation
2005 (English)In: Nuclear Technology, ISSN 0029-5450, Vol. 154, no 1, 41-51 p.Article in journal (Refereed) Published
Abstract [en]

We have designed a gas-cooled accelerator-driven system dedicated to transmutation of minor actinides. Thanks to the excellent neutron economy of the uranium-free fuel employed, the pin pitch to diameter ratio (P/D) could be increased to 1.8. The increased coolant fraction allows for decay heat removal at ambient pressure. The large coolant fraction further results in a low, pressure loss-26 kPa over the core, 35 kPa in. total. Thanks to the large P/D, the elevation of the heat exchanger necessary to remove decay heat by natural circulation is just more than I m. The absence of uranium in conjunction. with the presence of 35% (heavy atom) americium in the fuel results in a low effective delayed neutron fraction and a vanishing Doppler feedback, making subcritical operation mandatory.

Keyword
Accelerator-driven systems; Helium cooling; Minor actinide fuel; Actinides; Cooling; Heat exchangers; Monte Carlo methods; Nuclear reactors; Plutonium; Uranium; Actinide transmutation; Doppler feedback; Gas-cooled accelerator-driven system; Nuclear fuels
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-6790 (URN)000236616200003 ()2-s2.0-33645918000 (Scopus ID)
Note

QC 20141127

Available from: 2007-02-19 Created: 2007-02-19 Last updated: 2014-11-27Bibliographically approved
3. On TiN-particle fuel based helium-cooled transmutation systems
Open this publication in new window or tab >>On TiN-particle fuel based helium-cooled transmutation systems
2006 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 33, no 16, 1322-1328 p.Article in journal (Refereed) Published
Abstract [en]

We have designed a sub-critical helium-cooled core with TiN-coated particle fuel, dedicated to the transmutation of minor actinides. The excellent neutronic properties of helium allows for a low plutonium fraction in the fuel, which yields a low reactivity swing, Delta k = 2600 pcm, for a burnup of 31.2%. Further the neutron spectrum is hard, limiting the buildup of Cm and Cf. The high burnup combined with a minor actinide burning rate of 355 kg/GWth year makes the present design an attractive transmutation system.

Keyword
accelerator-driven systems, minor-actinide, neutronics, reactor, design
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-16212 (URN)10.1016/j.anucene.2006.08.012 (DOI)000242927300007 ()2-s2.0-33751081851 (Scopus ID)
Note

QC 20100820

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-04-11Bibliographically approved

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Citation style
  • apa
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