| 摘要 |
PURPOSE:To assure the role as a safe protection system by subjecting the detection signal of the neutron flux over a wide range from the inside of a nuclear reactor to pulse measurement and Campbell measurement to monitor period time as well as to display each output. CONSTITUTION:The signal outputted from a detector 30 is subjected to a frequency band sepn. by a preamplifier 32 and thereafter the high frequency component is amplified by an amplifier 33 for a pulse system and the intermediate frequency component by an amplifier 34 for a Campbell system, respectively. Said components are outputted as a signal for pulse measurement and a signal for Campbell measurement. The signals are subjected to the pulse measurement or Campbell measurement (square average) and are inputted to an output circuit. The change rates (period) with time of the respective signals are operated by period circuits 50, 51 and are selectively displayed on a period output display device 55 by being divided to the output display regions of SRM, IRM. The selected period outputs are monitored by a period comparator circuit 57 and a scram signal is outputted when said output exceeds preset specified time. |
