Uncontrolled CR withdrawal at normal operation is one of transients of the supercritical-pressure light water cooled reactor. Based on the physical and thermal analysis models, the related parameters are analyzed at the condition of Uncontrolled CR withdrawal at normal operation. The results show that both the reactivity of Doppler feedback decreases and the reactivity of density feedback decreases at first, the net reactivity changes slightly, which results in a modest increase in core power, the main coolant flow rate increases with the reactor power due to operation of the main steam temperature control system, the maximum cladding temperature increases, but it is below the criterion.

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