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CANFLEXCANDU Flexible Fuelling (advanced fuel design for CANDU nuclear reactors)
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One possibility that could affect the fuel properties would be changing to 43-element CANFLEX fuel or to some other geometry with different pin sizes.
It can also go beyond simple material changes, such as changing the bundle geometry (e.g., to CANFLEX) or using different compositions for different rings, which can improve bundle power distribution but increase the complexity of the bundle for manufacture.
This more advanced bundle (called CANFLEX) would contain more than twice as much Pu (4.6 wt% in ring 4 and 2.6 wt% in ring), and would extract about 3 times more energy out of the fuel.