The CANDLE burnup strategy is a new reactor burnup concept, where the distributions of fuel nuclide densities, neutron flux, and power density move with the same constant speed along the core axis from bottom to top (or from top to bottom) of the core and without any change in their shapes in the ideal condition such as the infinite core height. Therefore, burnup control rods can be almost eliminated, and several merits are expected. It can be applied easily to the block-type high temperature gas cooled reactor using an appropriate burnable poison with high neutron absorption cross section mixed with uranium oxide fuel. In this study, the natural gadolinium is used as the burnable poison. In the present study, the applicability and merits of CANDLE burnup to HTTR as actual core are shown.The reactivity loss from cold shutdown state to the steady state operation condition including the build-up of rapidly saturating FPs such as Xe-135 is 1.8% smaller than the conventional burnup of HTTR. Therefore, the required number of control rods is much smaller than the HTTR. It makes the control rod ejection accidents moderate. The average burnup of discharged fuel and the refueling period are much larger than the HTTR. Therefore, the economical feature becomes better than the HTTR.
各種検索
サポート
ヘルプ