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Analytical calculation of the fuel temperature reactivity coefficient for pebble bed and prismatic high temperature reactors for plutonium and uranium-thorium fuels
KTH, School of Engineering Sciences (SCI), Physics.
2007 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 34, no 1-2, 68-82 p.Article in journal (Refereed) Published
Abstract [en]

We analytically evaluated the fuel coefficient of temperature both for pebble bed and prismatic high temperature reactors when they utilize as fuel plutonium and minor actinides from light water reactors spent fuel or a mixture of 50% uranium, enriched 20% in U-235, and 50% thorium. In both cores the calculation involves the evaluation of the resonances integrals of the high absorbers fuel nuclides Pu-240, U-238 and Th-232 and it requires the esteem of the Dancoff-Ginsburg factor for a pebble bed or prismatic core. The Dancoff-Ginsburg factor represents the only discriminating parameter in the results for the two different reactors types; in fact, both the pebble bed and the prismatic reactors share the same the pseudo-cross-section describing an infinite medium made of graphite filled by TRISO particles. We considered only the resolved resonances with a statistical spin factor equal to one and we took into account 267, 72, 212 resonances in the range 1.057-5692, 6.674-14485, 21.78-3472 eV for Pu-240, U-238 and Th-232, respectively, for investigating the influence on the fuel temperature reactivity coefficient of the variation of the TRISO kernel radius and TFUSO particles packing fraction from 100, 200 to 300 Pm and from 10% to 50%, respectively. Finally, in the pebble bed core, we varied the radius of the pebble for setting a fuel temperature reactivity coefficient similar to the one of a prismatic core.

Place, publisher, year, edition, pages
2007. Vol. 34, no 1-2, 68-82 p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-37251DOI: 10.1016/j.anucene.2006.11.003ISI: 000245029800008ScopusID: 2-s2.0-33846934408OAI: diva2:432867
Available from: 2011-08-08 Created: 2011-08-08 Last updated: 2011-08-08Bibliographically approved

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