Proc. of 2004 Int. Congress on Advanced Nuclear Power Plants: ICAPP ‘04, June 13-17 2004, Pittsburgh, PA USA (CD)
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2004年
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The CANDLE burnup strategy is a new reactor burnup concept, where thedistributions of fuel nuclide densities, neutron flux, and power density move with the sameconstant speed along the core axis from bottom to top or from top to bottom of the core andwithout any change in their shapes. It can be applied easily to the block-type high temperature gascooled reactor using an appropriate burnable poison mixed with uranium oxide fuel. In thepresent study, the burnup distribution and the temperature distribution in the core are investigatedand their effects on the CANDLE burnup core characteristics are studied. In this study, the naturalgadolinium is used as the burnable poison. With the fuel enrichment of 15%, the naturalgadolinium concentration of 3.0% and the fuel pin pitch of 6.6cm, the CANDLE burnup is realizedwith the burning region moving speed of 29 cm/year and the axial half width of power densitydistribution of 1.5m for uniform group constant case at 900K. When the effect of nuclide changeby burnup is considered, the burning region speed becomes 25cm/year and the axial half-width ofpower density distribution becomes 1.25m. When the temperature distributions effect is considered,the effects on the core characteristics are smaller than the burnup distribution effect. Themaximum fuel temperature of the parallel flow case is higher than the counter flow case.
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