FIELD OF THE INVENTION The present invention relates to a nuclear reactor circuit capable of receiving nuclear fuel-containing molten salt in channels arranged generally vertically and providing an up-and-down passageway. The circuits may be used to build a modular nuclear reactor from discrete, removable molten salt nuclear circuits, a portion (“channel”) of which is disposed in a critical configuration, wherein the channel comprises a non-critical amount of nuclear Although containing material, the channels together create the critical region of the nuclear reactor core. The present invention also relates to a modular nuclear reactor circuit and a method of operating a nuclear reactor.
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