Plant protective instrumentation equipment

A plant protection instrumentation equipment, comprising:

• a sensor that detects a process signal indicating a quantity of a state of a plant;
• a plurality of A/D converters, each of the A/D converters converts the process signal into a digital signal and outputs a value corresponding to the digital signal;
• first to third instrumentation circuits, each of the instrumentation circuits receives the value corresponding to the digital signal from a respective one of the plurality of A/D converters and performs a logical operation using the value;
• and
• a judgment circuit that judges the state of the plant based on outputs of the first to third instrumentation circuits and outputs an operation signal based on the outputs of the first to third instrumentation circuits,
• wherein each of the instrumentation circuits comprises a logical integrated circuit including a set value comparator that compares the value corresponding to the digital signal with a predetermined set value, and outputs a signal when the value corresponding to the digital signal exceeds the set value, and
• wherein at least one logical integrated circuit of the first instrumentation circuit is different in at least one design factor from at least one logical integrated circuit of either of the second and third instrumentation circuits.

A plant protective instrumentation equipment, comprising:

• a radiation detector that outputs an analog signal corresponding to radiation dosage detected in a plant;
• a radiation monitoring device that monitors behavior of the radiation dosage based on the signal outputted from the radiation detector, comprising:
• an A/D converter that converts the analog signal outputted from the radiation detector into a digital signal;
• and
• a first radiation signal processing collective circuit, comprising:
• a plurality of radiation signal processing circuits, each of the radiation signal processing circuits calculates radiation dosage based on the digital signal and outputs a calculated result including a calculated radiation dosage;
• an output extraction circuit that outputs a signal based on the calculation results outputted from the radiation signal processing circuits based on a predetermined extraction rule;
• and
• a second radiation signal processing collective circuit which receives the digital signal outputted from the A/D converter and the signals outputted from the plurality of the radiation signal processing circuits and sends at least one output signal bypassing the output extraction circuit.

A plant protective instrumentation equipment, comprising:

• a radiation detector that outputs an analog signal corresponding to radiation dosage detected in a plant;
• a radiation monitoring device that monitors behavior of the radiation dosage based on the signal outputted from the radiation detector, comprising:
• an A/D converter that converts the analog signal outputted from the radiation detector into a digital signal;
• a first radiation signal processing collective circuit, comprising:
• a plurality of radiation signal processing circuits, each of the radiation signal processing circuits calculates radiation dosage based on the digital signal and outputs a calculated result including a calculated radiation dosage;
• an output extraction circuit that outputs a signal based on the calculation results outputted from the radiation signal processing circuits based on a predetermined extraction rule;
• and
• a first failure detection circuit that outputs a first failure signal when detecting a situation that at most one of the plurality of radiation signal processing circuits has not failed or that the output extraction circuit has failed.

A plant protection instrumentation equipment, comprising:

• a sensor that detects a process signal indicating a quantity of a state of a plant;
• a plurality of A/D converters, each of the A/D converters converts the process signal into a digital signal and outputs a value corresponding to the digital signal;
• a plurality of instrumentation circuits, comprising a first instrumentation circuit and a second instrumentation circuit, each of the instrumentation circuits receives the value corresponding to the digital signal and performs a logical operation using the value;
• and
• a judgment circuit that judges the state of the plant based on outputs of the plurality of instrumentation circuits and outputs an operation signal based on the outputs of the plurality of instrumentation circuits,
• wherein each of the instrumentation circuits comprises a logical integrated circuit including a set value comparator that compares the value corresponding to the digital signal with a predetermined set value, and outputs a signal when the value corresponding to the digital signal exceeds the set value,
• wherein the value corresponding to the digital signal is a first value that is inputted into a first set value comparator of the first instrumentation circuit and is inputted into a second set value comparator of the second instrumentation circuit,
• wherein the second instrumentation circuit outputs a second value, and
• wherein the first set value comparator compares the first value and the second value outputted from the second instrumentation circuit for calculating a deviation between the first value and the second value to judge abnormality.