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Looks like IFR is cooled specifically by liquid sodium. The evidence that exists according to wikipedia about safety problems (neg ev, I suppose), indicates that sodium's reactivity with water (and therefore, most air) is a problem. Even the other liquid metal coolant under Gen IV has a different cooling process (using convection, which generally involves air), so the evidence on IFR wouldn't even apply to the other liquid metal coolants. I imagine that most of the evidence on IFR makes some fine distinctions between the different Gen IV coolants (CP Ground, I'm sure). So the Novice Case Limits is (should be?) about specifically sodium cooled reactors.
EDIT: There are two types of liquid sodium cooled reactors, by the way. IFR and the Fast Breeder Reactor, which is entirely different (it is designed to increase the fissile material from what is inputed). So even within Sodium reactors, there are distinctions that would exist in the ev. It seems that they're radically difficult enough--the Fast Breeder Reactor has two functions for it's liquid metal and the IFR seems to have one (I could be reading the schematic wrong).
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