A circulating-fuel nuclear reactor comprising: a reactor core chamber having an inlet and an outlet for fluid fuel; a heat exchanger configured to receive fluid fuel from the reactor core chamber via the outlet, to transfer heat from the fluid fuel, and to return the fluid fuel to the reactor core chamber via the inlet; a flow regulator operable to vary an operational flow rate of fluid fuel through the heat exchanger; and a control module configured to cause the flow regulator to vary the operational flow rate of fluid fuel through the heat exchanger to maintain an operational temperature of the fluid fuel within a predetermined range.
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