题目内容
In the fourth-generation reactor, the reactor type that requires additional moderators is the ______ , and the moderator used is ______ .
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Among the fourth-generation reactors, the reactor types that use closed fuel cycles are ______ , ______ , ______ , and ______ .
The coolants that can be used as gas-cooled fast reactors are helium and ______ , which are characterized by good compatibility with the materials in the reactor, small neutron absorption cross-section, high outlet temperature, ______ S-CO2 density, and easy compression , The temperature required for the cycle does not need to be too high to be as efficient as the helium cycle.
Among the fourth-generation reactors, the reactor types that use different fuel forms are ______ and ______ .
For the fourth generation reactor, the greater the reaction power, the better the economy.
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