| 摘要 |
<p>PURPOSE:To reduce the load of an operator participating in range change-over operation while preventing the unnecessary emergency stoppage of an atomic reactor, by outputting the signal from a monitor apparatus only when a signal to be monitored is present in a range after the range was changed over. CONSTITUTION:When the output of an intermediate region neutral monitor signal processing apparatus 4 reaches a range-up permitting set value or more, the output of a setting device 31 is turned ON and a timer 34 is operated and, after a predetermined time, an automatic range change-over signal 22 is outputted. By this mechanism, a correction unit 7 outputs the attenuation ratio corresponding to a new range while a hold circuit 37 is set and a contact 37a is turned OFF and a contact 37b is connected to the side of memory 38 and a neutron flux signal, before the contacts are operated, is outputted to lower stage machinery. When the neutron flux signal in a new range is present in a set value, the output of the setting device 31 is turned OFF and the hold circuit 37 is reset and the neutron flux signal in the new range is outputted to the lower stage machinery.</p> |
