Currently, most of the power-level control methods of nuclear reactors are given based upon the scheme of inducing reactivity directly via control rods. However, the reactivity can also be injected indirectly via the negative temperature feedback effect. Motivated by this, a cascaded power-level control of high temperature gas-cooled reactor (HTGR) is proposed by only regulating primary helium flowrate, which can be able to provide globally asymptotical closed-loop stability. This new HTGR power-level control is composed by a helium temperature controller and a neutron flux controller. The former controller, which is located in the inner loop, regulates the primary helium flowrate according to the setpoint of helium temperature. While, the latter one in the outer loop revises the setpoint of helium temperature so as to regulate neutron flux. Numerical simulation results verify the theoretical result while showing the satisfactory performance as well as the influence from the controller parameters.

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