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Feasibility Study of 1/3 Thorium-Plutonium Mixed Oxide Core

Cheuk Wah Lau (Institutionen för teknisk fysik, Nukleär teknik) ; Henrik Nylén (Institutionen för teknisk fysik, Nukleär teknik) ; Klara Insulander Björk (Institutionen för teknisk fysik, Nukleär teknik) ; Urban Sandberg
Science and Technology of Nuclear Installations (1687-6083). Vol. 2014 (2014), Art. no. 709415,
[Artikel, refereegranskad vetenskaplig]

Thorium-plutonium mixed oxide (Th-MOX) fuel has become one of the most promising solutions to reduce a large and increasing plutonium stockpile. Compared with traditional uranium-plutonium mixed oxide (U-MOX) fuels, Th-MOX fuel has higher consumption rate of plutonium in LWRs. Besides, thorium based fuels have improved thermomechanical material properties compared with traditional U-MOX fuels. Previous studies on a full Th-MOX core have shown reduced efficiency in reactivity control mechanisms, stronger reactivity feedback, and a significantly lower fraction of delayed neutrons compared with a traditional uranium oxide (UOX) core. These problems complicate the implementation of a full Th-MOX core in a similar way as for a traditional U-MOX core. In order to reduce and avoid some of these issues, the introduction of a lower fraction of Th-MOX fuel in the core is proposed. In this study, one-third of the assemblies are Th-MOX fuel, and the rest are traditional UOX fuel. The feasibility study is based on the Swedish Ringhals-3 PWR. The results show that the core characteristics are more similar to a traditional UOX core, and the fraction of delayed neutrons is within acceptable limits. Moreover, the damping of axial xenon oscillations induced by control rod insertions is almost 5 times more effective for the 1/3 Th-MOX core compared with the standard core.

Nyckelord: Thorium, PWR, Th-MOX

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Denna post skapades 2014-04-25. Senast ändrad 2015-04-27.
CPL Pubid: 197144


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)



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