JP2002116286A - Abnormality response device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely conduct quick operation of alarm and termination, in case of errors, which take highest priority for safety. SOLUTION: Two sensors A and B for detecting high radiation state exceeding a threshold are arranged with an interval. The sensors are connected to the first determining part 14 of a determining means 19 and the first determines part 14 operates an alarm of an alarm unit 16 when the two sensors A and B simultaneously detect high radiation. Then the second determines part 18 determines whether the detection of high radiation by the sensors A and B continues over a certain time and the detection is correct. If it is correct, the alarm is continued, and if not correct, the alarm is terminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal response device such as an alarm device, a sprinkler, an emergency stop device, etc., and particularly to a critical device in a nuclear facility for reprocessing or processing nuclear fuel and other facilities. The present invention relates to an abnormality handling apparatus for detecting an abnormal situation and issuing an alarm when the abnormal situation occurs.

[0002]

2. Description of the Related Art Conventionally, in a facility handling nuclear fuel such as a nuclear fuel reprocessing facility and a nuclear fuel processing facility, in the event of a criticality accident or event, workers are immediately notified and evacuated to the outside of the facility at an early stage. Criticality warning systems are in place to prevent excessive radiation exposure and to shut down facilities. Generally, in such a criticality warning system, a sensor for detecting, for example, a gamma ray dose rate is used as a radiation detector for detecting an abnormality such as an accident, and this sensor is provided for a device to be monitored for radiation. I have. For example, there is a criticality warning system shown in FIG. 4. In this system, a plurality of sensors A and B are arranged apart from each other, and these sensors A and B are provided with a switch a and a switch b provided in the alarm device 1. Warning judgment device 2 through each of
And an alarm unit 3 is connected to the criticality alarm determiner 2.

When the gamma ray dose rate exceeds the threshold value, the sensors A and B detect this and turn on the switches a and b, respectively. Upon detection, the alarm unit 3 is activated, and an alarm is issued. To release the alarm, it is necessary to manually reset the switches a and b. By the way, in such a criticality warning system, the switches a and b may be turned on at the same time due to instantaneous noise or the like. In such a case, the alarm sounds, and the switch a or b is manually turned off to stop the alarm. Reset operation was required. In particular, if such a situation occurs when there are few human hands such as holidays or nighttime, it takes a long time to stop the alarm, and the problem is serious. In addition, malfunctions due to electrical noise due to lightning strikes are not rare, and repetition of this may lead to delays in evacuation due to misunderstandings when workers and others are used to alarms and a criticality accident occurs. Was.

In order to prevent such an erroneous operation of an alarm, an alarm system is provided in which an alarm is issued for the first time by recognizing a plurality of stages of abnormality detection by adding another abnormality detecting means in addition to the abnormality detection by a sensor. Has also been proposed. For example, the alarm device disclosed in Japanese Patent Application Laid-Open No. 8-146189 recognizes that the gamma ray dose rates of a plurality of sensors each exceed a threshold value, and that the doubling times of the dose rates detected by the plurality of sensors match. Only to judge that it is critical. In this way, by comprehensively judging the information of a plurality of stages, it is accurately confirmed whether or not an erroneous detection has been made, and then an alarm is issued only after that.
Such a multi-stage alarm system is not limited to the criticality alarm device but is also used in other alarm devices. For example, in a fire alarm device, if an alarm and a sprinkler are activated by a one-step abnormality detection such as smoke detection, if it is a malfunction, a machine or a product will be flooded with water and the damage will be heavy. For this reason, in addition to the detection in the first stage, an alarm system such as an alarm and an actuation of a sprinkler through a detection in a second stage such as a room temperature exceeding a threshold value is employed. The reason for employing such an alarm system is that the time required for comprehensively judging from multiple stages of information and accurately judging whether or not an erroneous detection is accurate is, for example, about several seconds, so that fire extinguishing and fire spread prevention during that time are required. It is considered that the effect of the loss due to the delay is smaller than the damage caused by the fire fighting operation due to the malfunction.

[0005]

However, in the case of criticality warnings and other warnings for emergency situations, even if the warning is issued for 0.5 to several seconds, if the delay is too long, the damage will be large, and it will be as soon as possible. It is necessary to alert workers to evacuation from the site. For that purpose, a system that issues an alarm only after comprehensively judging through the above-described abnormality detection in a plurality of stages as described above is not preferable in view of quickness and safety of workers. The present invention has been made in view of the above circumstances, and has as its object to provide an abnormality response device that can accurately and promptly check whether an alarm has been activated and whether there has been an erroneous detection.

[0006]

An abnormality handling apparatus according to the present invention includes a determination unit for detecting an abnormality and an alarm unit for activating an alarm. The determination unit detects the abnormality and issues an alarm to the alarm unit. , And another determining unit that determines whether the abnormality detection is incorrect after the alarm is activated and continues or stops the operation of the alarm. When an abnormality is detected by the first judgment unit of the abnormality response device, an alarm is immediately issued regardless of whether the abnormality is correct or not, and the possibility of occurrence of an abnormal situation is communicated to workers etc. to promptly perform evacuation activities etc. Then, the correctness of the abnormality detection is determined, and if it is determined to be correct, it is recognized as abnormal and the alarm is continuously activated to further evacuate, and if it is incorrect, the alarm operation is stopped by immediately stopping It is possible to recognize the erroneous detection and minimize the malfunction due to the malfunction, and to stop the alarm due to the malfunction without any manual operation even on holidays or at night. By such an operation control, quick and accurate alarm control can be performed with safety being the highest priority. In addition, the determination may be made by one-stage determination as another determination unit. In this case, the operation of the alarm can be quickly stopped or continued or the corresponding measures can be performed, or a plurality of determination units can be provided to satisfy a plurality of determination conditions. Whether the abnormality detection is correct or not may be comprehensively determined based on whether or not they match, and in this case, the reliability of the abnormality detection is further increased.

[0007] Further, when the other judging section judges that the abnormality detection is not erroneous, the next processing may be executed. As countermeasures against an abnormal situation as the next stage processing, operation stoppage of facilities, emergency stoppage of machines, operation of disaster prevention equipment such as sprinklers and the like can be performed. In this case, since the occurrence of an abnormal situation causing an alarm is confirmed by another determination unit prior to the next processing, the possibility of executing the next processing due to a malfunction is small, and the possibility of executing the next processing due to a malfunction is reduced. Appropriate countermeasures against abnormal situations.

The abnormality handling apparatus according to the present invention comprises a plurality of sensors for detecting an abnormality, a judging means for judging that the sensor has detected an abnormality, and an alarm unit for activating an alarm based on an output from the judging means. An abnormality handling device comprising: a first determination unit that activates an alarm unit when a plurality of sensors simultaneously detect an abnormality, and a time when the abnormality is detected by the plurality of sensors after the alarm is activated for a predetermined time. A second determination unit that determines whether or not the above is the case and continues or stops the operation of the alarm.
When an abnormality is detected by a plurality of sensors at the same time, the first judgment unit of the judging means judges the abnormality and activates an alarm by an alarm unit. Thereafter, it is determined whether the abnormality detection by the sensor is erroneous, and it is determined that the error is not error. In this case, it is recognized as abnormal and the alarm is continuously activated, and if it is determined that it is incorrect, it is recognized as malfunction and a stop signal of the alarm is output to stop.
As a result, it is possible to automatically perform a quick alarm with safety as a top priority and automatically stop the alarm in the case of a malfunction.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an alarm device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a schematic configuration of an alarm device according to an embodiment, and FIG.
3 is a flowchart showing an operation process by the alarm device shown in FIG. The abnormality handling device shown in FIG. 1, for example, an alarm device 10 includes an alarm device 12 and a plurality of sensors disposed outside thereof, for example, two sensors A and B. The alarm device 10 is disposed outside a radiation monitoring device (not shown), and the sensors A and B are provided at positions separated from each other. The sensors A and B are, for example, radiation detectors,
A gamma ray generated by fission is detected. When the gamma ray dose rate exceeds a predetermined threshold value which is higher than usual, the signal is judged to be abnormal or critical, and a signal is issued.
Output. The wires of the sensors A and B are connected to a first judging section 14 in the alarm device 12, and the first judging section 14 receives signals from the sensors A and B, and both the sensors A and B simultaneously perform a threshold. It is determined that high radiation exceeding the value (hereinafter referred to as high radiation) is detected, and a signal is output to the alarm unit 16. The alarm unit 16 turns on or off the alarm by inputting a signal.
F switching control is performed.

A second determining unit 18 in the alarm device 12 is connected to the first determining unit 14 and the alarm unit 16 and, for example, detects a high radiation state detected by the sensors A and B for a predetermined period of time (for example, 0 seconds). .5 seconds or more). If the high radiation state, that is, the gamma ray dose rate continuously exceeds the threshold for a predetermined time or more, the alarm unit 16 activates an alarm. Is continued, and if it does not continue for a predetermined time or more, it is determined that a false detection has been made, and the warning of the warning unit 16 is stopped. Therefore, the second determination unit 18 may be directly connected to the sensors A and B. The first determining unit 14 and the second determining unit 18 determine
Is configured. In addition, as shown in FIG. 1, the second determination unit 18 may be connected to a control device 20 outside the alarm device 12, and in this case, the control device 20 is, for example, a device for urgently stopping the operation of a nuclear facility, When the second determination unit 18 recognizes that the high radiation state detected by the sensors A and B has continued for a predetermined time or more, the control device 20 may be operated to stop the operation of the nuclear facility.

The alarm device according to the present embodiment has the above-described configuration. Next, the operation will be described with reference to the flowchart shown in FIG. When the sensors A and B separately disposed outside the monitoring target device simultaneously detect that the gamma ray dose rate has exceeded the threshold value and a high radiation state has occurred (step 101), the sensors A and B in the alarm device 12 The one determination unit 14 detects this, and immediately activates the alarm unit 16 to activate an alarm (step 102). In this case, even if the detection by the sensors A and B is an erroneous report due to noise or the like, an alarm is issued as soon as possible, so that a worker or the like can be informed and separated from the site. Next, the second determination unit 18 determines whether the detection of high radiation by the sensors A and B has continued for a predetermined time or more (step 10).
3) If not continued, the alarm unit 16 is stopped (step 104). This allows the worker to recognize that the alarm was a false alarm,
Can be automatically stopped. If the detection of high radiation by the sensors A and B has continued for a certain period of time or more (step 103), it is determined that the state is high radiation, and the operation of the alarm unit 16 is continued (step 105). In this case, the operation of the alarm unit 16 may be continued and the other control device 20 may be activated to stop the operation of the facility, for example (step 106).

As described above, according to the present embodiment, when the sensors A and B detect high radiation, an alarm is immediately issued without confirming whether or not the detection is erroneous. Evacuation and countermeasures are performed, and then sensors A and B
It is determined whether or not the detection by erroneous detection is due to noise or the like, so that safety can be given top priority and the alarm device can play its original role. In addition, if the alarm is a false alarm, the alarm is stopped after the elapse of a predetermined time, so that the worker can easily recognize that the alarm is a false report, and it is possible to prevent the worker or the like from being used to the alarm due to the false report.

In the above embodiment, the sensors A and B
As another determination unit for determining whether or not the high radiation detected in the above is erroneous detection, the high radiation state by the sensors A and B, that is, whether or not the gamma ray dose rate continuously exceeds the threshold for a predetermined time or more is determined. Although the determination is made in one stage by the one determination unit 14, the present invention is not limited to this, and a plurality of stages of determination units may be employed. For example, as shown in FIG. 3, as the determination means 22, a first determination unit 14, a second determination unit 18, a third determination unit 24,... In this case, it is determined that the high radiation has been detected simultaneously by the sensors A and B in the first determination unit 14 and the alarm unit 16 is turned on.
N, an alarm is activated, and then, as another determining unit, in the first stage, the second determining unit 18 determines whether the duration of the high radiation detected by the sensors A and B is equal to or longer than a certain value. In the second stage, the third determination unit 24 determines whether or not the detection by the sensors A and B is erroneous detection based on a plurality of determination conditions by determining whether or not the increase rate of the gamma ray dose rate is equal to or more than a specified value. May be. In this case, the second determination unit 18 to the X-th determination unit 26
If any one of the conditions does not satisfy the determination condition, it is determined that the detection is erroneous, and the operation of the alarm unit 16 can be stopped.

In the above-described embodiment, the high radiation warning device in a nuclear facility such as a nuclear fuel reprocessing facility or a nuclear fuel processing facility has been described. However, the present invention is not limited to such a configuration. It can be applied to an abnormality response device including the alarm device. For example, it may be used for a fire alarm device. In this case, the control device 20 constitutes a screener and other disaster prevention devices.

[0015]

As described above, in the abnormality handling apparatus according to the present invention, the judging means comprises: a first judging section for detecting an abnormality and activating an alarm to the alarm unit; And another judgment unit that performs the continuation or stop of the operation of the alarm by judging whether the first judgment unit detects an abnormality. The possibility of occurrence of an abnormal situation is communicated and evacuation activities etc. are performed promptly.After that, the correctness of error detection is judged, and if it is correct, the alarm continues to be activated to further promote evacuation and erroneous detection. In the case of, by stopping the alarm operation, workers etc. can immediately recognize the malfunction of the alarm, and the malfunction due to the malfunction can be minimized. The alarm can be stopped by activation, and safety is given top priority. In it performs the control of the precise alarm.

[0016] Further, if the other judging section judges that the detection of the abnormality is not an error, the next step is executed. Therefore, prior to the next step, the occurrence of an abnormal situation causing an alarm is determined. Therefore, the possibility of executing the next process due to a malfunction is small, and appropriate countermeasures against an abnormal situation can be performed along the system installed in advance.

Further, in the abnormality handling apparatus according to the present invention, the judging means comprises a first judging section for activating an alarm unit when a plurality of sensors simultaneously detect an abnormality, and a time for detecting an abnormality by the plurality of sensors after the alarm is activated. Since it is provided with a second determination unit that determines whether or not it is longer than a predetermined time and continues or stops the operation of the alarm, a quick alarm that gives priority to safety by this, and a subsequent alarm after a malfunction in the case of malfunction Operation can be stopped automatically.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an alarm device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation process performed by the alarm device according to the embodiment;

FIG. 3 is a block diagram of a determination unit according to a modification of the embodiment.

FIG. 4 is a block diagram showing a schematic configuration of a conventional alarm device.

[Explanation of symbols]

 Reference Signs List 10 alarm device (abnormality response device) 12 alarm device 14 first determination unit 16 alarm unit 18 second determination unit (other determination unit) 19, 22 determination unit 24 third determination unit (other determination unit) A, B sensor

Claims (3)

[Claims] 1. An alarm device comprising: a determination unit that detects an abnormality; and an alarm unit that activates an alarm. The determination unit detects an abnormality and activates an alarm in the alarm unit. An abnormality handling device, comprising: a determination unit that determines whether the abnormality detection is erroneous and continues or stops the operation of the alarm. 2. The abnormality handling apparatus according to claim 1, wherein when the other determination unit determines that the abnormality detection is not an error, the next step is executed. 3. An abnormality handling apparatus comprising: a plurality of sensors for detecting an abnormality; a determination unit that determines that the sensor has detected an abnormality; and an alarm unit that activates an alarm based on an output from the determination unit. The determination means includes a first determination unit that activates an alarm unit when the plurality of sensors simultaneously detect an abnormality, and whether a time during which the plurality of sensors detect an abnormality after the alarm is activated is equal to or longer than a predetermined time. And a second determination unit that determines whether the alarm is to be continued or stopped.