Reactor Control Issues
The advantage of the high negative temperature coefficient is offset by the fact that it also increases reactor control difficulty. For example, since the coolant and moderator are one-and-the-same, relatively cold, dense coolant entering the core will increase moderation, slowing down more neutrons, and cause reactivity to increase. The resulting power increase would rapidly be quelled by the effect of the negative temperature coefficient but may cause the reactor to shut down prematurely.
Read more about this topic: Organically Moderated And Cooled Reactor, Organic Moderator, Disadvantages
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