FIELD: nuclear reactor safety systems responding to abnormal neutron flux density. SUBSTANCE: neutron flux parameters are measured, their current value is compared with threshold value, and emergency signal is shaped in case current value rises above threshold one. Used as current value is measured variable in the form of signal proportional to neutron flux density. Threshold value is calculated from formula which is given in the specification. EFFECT: reduced time and enhanced precision of predicting emergency situation. 1 dwg
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