One or more primarily gamma-ray-sensitive (rapid response) self-powered detector-type radiation measurement devices installed in the reactor core allow the reactor multiplication factor (Keff) value to be linked to the reactor. A subcritical reactivity monitoring device that determines how much lower than the reactivity required to realize or maintain the system is achieved. The present invention utilizes the change in current measured with a self-powered detector to allow the reactor operator to make virtually any desired during the reactor shutdown period when the Keff value is below the critical value (1.0). The Keff value can be measured at intervals of. The present invention also further eliminates costs associated with the operational and core design constraints associated with current boron dilution accident prevention methods and automatic control of the chemical volume control system by directly incorporating the Keff value output into the reactor protection system. Enable.
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