Proc. of 5th International Conference on Nuclear Option in Countries with Small and Medium Electricity Grids, Dubrovnik, Croatia, May 16-20, (CD)
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2004年
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A new reactor burnup strategy CANDLE (Constant Axial shape of Neutron flux, nuclide densities and power shapeDuring Life of Energy producing reactor) was proposed [1], where shapes of neutron flux, nuclide densities and powerdensity distributions remain constant but move to an axial direction. An equilibrium state was obtained for a large fastreactor (core radius is 2m) successfully by using a newly developed direct analysis code. However, it is difficult toapply this burnup strategy to small reactors (core radius is 0.8m), since its neturon leakage becomes large and neutorneconomy becomes worse. In the present paper, the long-life small fast reactor with nitride fuel and LBE coolant isinvestigated. The 5% enrichment of plutonium makes possible to perform CANDLE burnup. The simulation isperformed. The core height of 2 to 3 m can realize the operation period of 9 to 28 years with a very small excessreactivity change of less than 0.2% during whole operation period.
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