JP5084860B2 - Electric equipment for radioactive material management facility and electronic device monitoring method thereof - Google Patents

Description

  The present invention relates to an electrical apparatus for a radioactive substance management facility and an electronic device monitoring method thereof that can confirm whether internal components are healthy without unsealing the radiation measuring apparatus.

  As shown in FIG. 5, the radiation measuring apparatus 20 that is a device that measures radiation includes various parts of the radioactive material management facility 100 (for example, the radioactive material management facility 100) having a management area that handles radioactive materials such as a nuclear power plant. It arrange | positions at the storage box 110 provided in the wall (refer nonpatent literature 1, 2, 3).

  Among the radiation measuring devices, radiation is detected, and the detection result is output with a very small current such as μA or pA, or a very small current such as a preamplifier 24 that amplifies the very small current output from the detector 22. The radiation measuring apparatus 20 that operates is provided with an electronic circuit that operates with a very small current inside the radiation measuring apparatus 20.

  The detector 22 has one internal space that accommodates components necessary for the operation of the detector 22. In general, the detector 22 is installed at a position where the inspector can visually recognize in a normal posture, and is slightly above the inspector's line of sight (for example, a height in the range of about 1.8 m to 2 m from the floor). Is installed. The detector 22 is installed so as to be perpendicular to the wall. For example, some detectors are installed at the end of a frame extending downward from the ceiling. Thus, the detector 22 is generally installed at a position where radiation can be easily measured, and is often not installed at a position suitable for opening the inside of the detector 22. In addition, the detector 22 is installed in a direction perpendicular to the pipe or installed in a manner along the pipe so that the detector 22 measures the radiation in the vicinity of the pipe.

  Since the detector 22 handles particularly minute currents such as μA and pA, the preamplifier 24 is installed near the detector 22 where the divided voltage effect is hardly affected. The size of the preamplifier 24 is, for example, about 30 cm in length, about 15 cm to 20 cm in width, and about 15 cm in thickness.

  Electronic circuits such as the detector 22 and the preamplifier 24 have a structure that handles micro currents such as μA and pA. Therefore, when rust due to moisture occurs in the electronic circuit, the electrical resistance of the electronic circuit changes, and as a result The very small current flowing through the circuit changes greatly, and the radiation measurement apparatus cannot perform accurate radiation measurement. The preamplifier 24 is firmly assembled by a mounting means such as a bolt in a dedicated box (not shown). The dedicated box is also firmly fixed to the wall or the like by attachment means such as bolts.

  Therefore, the radiation measurement device is formed with a rigid frame so that the inside of the radiation measurement device has a sealed structure, a hygroscopic agent such as silica gel is installed inside the radiation measurement device, and the inside of the radiation measurement device is dried. Maintained in a state. Moreover, the lid | cover for putting a hygroscopic agent in the inside of a radiation measuring device is attached to the flame | frame via packing.

  Since the hygroscopic agent and packing installed inside the radiation measuring device deteriorate over time, the inspector who checks the radiation measuring device in order to stably maintain the inside of the radiation measuring device is an electronic circuit, a hygroscopic agent. It is necessary to periodically replace internal parts such as packing.

  Since the radiation measuring apparatus is formed of a solid frame, generally, the inside of the radiation measuring apparatus cannot be visually recognized. Therefore, the inspector must unravel the sealed state of the radiation measuring apparatus, take out the parts inside the radiation measuring apparatus, and then determine whether or not replacement of the parts inside the radiation measuring apparatus is necessary.

  Since the inspector cannot visually check the state of the internal components of the radiation measuring apparatus from the outside of the radiation measuring apparatus, the inspector cannot check the state of the radiation measuring apparatus even if the state of the internal parts of the radiation measuring apparatus is healthy. According to the replacement cycle, the radiation measurement device is forcibly released from the sealed state and the internal components are taken out.

  When the inspector takes out the internal components of the radiation measurement device, it is inadvertently prepared for the components that were in a healthy state by forcibly releasing the sealed state of the radiation measurement device, even though it was a healthy component. There is a risk of attaching moisture. In addition, when the inspector takes out the internal components of the radiation measuring apparatus, the inspector may inadvertently damage or accelerate deterioration of other internal components and circuits. . In particular, since the inside of radioactive material management facilities often has high humidity values, in such a situation, forcibly releasing the sealed state of the radiation measurement device was installed inside the radiation measurement device. The hygroscopic agent absorbs the moisture inside the radioactive substance management facility, and the utility runs out earlier than the original operation period of the hygroscopic agent.

http: // www. fesys. co. jp / sougou / seihin / p09 / rad. html http: // www. fesys. co. jp / sougou / seihin / p09 / pdf / CNO2100-1b. pdf http: // www. jaea. go. jp / 04 / turuga / jturuga / realtime / unchange_file / expln_1. html

  An object of the present invention is to provide an electrical apparatus for a radioactive substance management facility capable of confirming whether internal components are sound without unsealing the radiation measurement apparatus.

  An electrical apparatus for a radioactive substance management facility according to the present invention includes a casing disposed in the radioactive substance management facility, an electronic device disposed in the casing, the casing disposed in the casing, and the casing A moisture absorber that absorbs moisture inside the housing, a humidity sensor unit that is disposed inside the housing and detects humidity inside the housing, and a display that displays humidity data detected by the humidity sensor unit A section.

  An electrical apparatus for a radioactive substance management facility according to the present invention includes a control calculation unit that calculates a replacement timing of the moisture absorber based on a history of measurement values from the humidity sensor unit, and an exchange calculated by the control calculation unit. You may provide the alerting | reporting part which alert | reports time.

  The output signal line of the humidity sensor unit may pass through a cable through which the output signal line of the electronic device passes.

  The humidity sensor unit includes a plurality of humidity sensor units, and the control calculation unit determines that the plurality of humidity sensors are different when measured values of the plurality of humidity sensor units exceed a predetermined value. You may make it alert | report that any one of parts is abnormal.

  The humidity sensor unit is configured with three or more humidity sensors, and the control calculation unit is configured so that two or more approximate measured values of the measured values of the three or more humidity sensors are the humidity. Also good.

  An electronic device monitoring method for an electrical apparatus for a radioactive substance management facility according to the present invention includes a measurement step of detecting humidity inside the housing, a display step of displaying detected humidity data, and a plurality of humidity sensors. A notifying step of notifying that any one of the plurality of humidity sensors is abnormal when the measured values differ from each other by a predetermined value.

  According to another aspect of the present invention, there is provided a method for monitoring an electronic device of an electrical apparatus for a radioactive material management facility according to the measurement step of detecting humidity inside the housing and two or more approximated values measured by the three or more humidity sensors. A display step of displaying the measured value as the humidity.

  According to the present invention, the electrical apparatus for a radioactive substance management facility includes a humidity sensor unit that detects the humidity inside the housing and a display unit that displays data on the humidity detected by the humidity sensor unit. Can know the humidity inside the sealed casing simply by looking at the humidity data of the display unit.

  Further, the control calculation unit calculates the replacement time of the moisture absorber based on the history of measured values from the humidity sensor unit, and the notification unit notifies the replacement time calculated by the control calculation unit. It is possible to know the replacement time of the absorber, and it is not necessary to perform unnecessary inspection by opening the housing.

  In addition, since the output signal line of the humidity sensor section passes through the cable through which the output signal line of the electronic device passes, a new humidity sensor section can be provided in the casing without impairing the sealing performance of the casing. it can.

  In addition, the humidity sensor unit is composed of a plurality of humidity sensor units, and the control calculation unit is configured such that when the measured values of the plurality of humidity sensor units exceed a predetermined value, there is a difference between the plurality of humidity sensor units. Since any one of them is informed, the inspector can detect a failure of the humidity sensor part at an early stage.

  In addition, the humidity sensor unit is composed of three or more humidity sensor units, and the control calculation unit sets the two or more approximate measured values of the measured values of the three or more humidity sensor units as the humidity. Yes. In general, there is almost no possibility that the humidity sensor part manufactured at the same time will fail at the same time. Therefore, even if one humidity sensor unit fails, measured values from two or more approximate humidity sensor units among the three or more humidity sensor units can be handled as normal measured values.

It is a schematic diagram which shows the outline | summary of the electric equipment for radioactive substance management facilities which concerns on this invention. It is a perspective view of the electronic device of the electric equipment for radioactive substance management facilities shown in FIG. It is a schematic diagram which shows the outline | summary of another electric equipment for radioactive material management facilities which concerns on this invention. It is a perspective view of the electronic device of the electric equipment for radioactive substance management facilities shown in FIG. It is a perspective view which shows the conventional electric apparatus for radioactive substance management facilities.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
Referring to FIG. 1, an electrical apparatus for a radioactive material management facility according to the present invention is indicated generally by the numeral 10.

  As shown in FIG. 1, the radioactive substance management facility electrical apparatus 10 is a radiation measuring apparatus in the present embodiment, and is installed in the radioactive substance management facility 100 to detect radiation, And a preamplifier 24 for amplifying the very small current output from the device 22. The detector 22 and the preamplifier 24 constitute the electronic device 21 and are hermetically accommodated in the internal space 50 a of the housing 50.

  The preamplifier 24 amplifies the very small current output from the detector 22, and the amplified current is sent to the central control room 40 installed outside the management area via the preamplifier output signal line inside the cable 28. Is output to the control calculation unit 41 as a detected current.

  The central control room 40 includes a control calculation unit 41 that receives the detection current output via the preamplifier output signal line, and an instruction unit 42 that displays the amount of radiation based on the detection current.

  A supervisor who monitors the radioactive substance management facility 100 in the management area can monitor whether or not the amount of radiation inside the radioactive substance management facility 100 is abnormal outside the management area by displaying on the instruction unit 42.

  The internal space 50a accommodates a moisture absorber 25 such as silica gel that prevents the detector 22 and the preamplifier 24 from malfunctioning due to moisture, and a humidity sensor unit 26 that detects the humidity of the internal space 50a. In the present embodiment, the humidity sensor unit 26 is composed of one humidity sensor.

  The humidity sensor unit 26 measures the humidity of the internal space 50a, and uses the measured humidity data as a measurement value via a humidity data output signal line inside the cable 28. It is comprised so that it may output to the control calculation part 41 of the control room 40. FIG.

  The control calculation unit 41 of the central control room 40 further receives a measurement value output via the preamplifier output signal line. The central control room 40 further includes a display unit 43 that displays the humidity value based on the measurement value, and a storage unit 44 that stores the history of the measurement value from the humidity sensor unit 26. The control calculation unit 41 is further configured to be able to calculate the replacement time of the moisture absorber 25 based on the history of measurement values stored in the storage unit 44.

  The central control room 40 further includes a notification unit 45 that notifies the replacement time calculated by the control calculation unit 41.

  The notification unit 45 is configured to notify the inspector with a display indicating that the replacement time is approaching the display unit 43 and a sound by a warning sound.

  The storage unit 44 also stores calculation data necessary for the control calculation unit 41 to calculate the replacement time of the moisture absorber 25 based on the history of measurement values stored in the storage unit 44.

  The monitor monitors the display unit 43 to see if the humidity value in the internal space 50a of the detector 22 is abnormal outside the management area. In the present embodiment, the display unit 43 is a separate display unit from the instruction unit 42. However, instead of providing the display unit 43, the amount of radiation and humidity are simultaneously displayed in the display area of the instruction unit 42, or The amount of radiation and the humidity may be selectively switched and displayed each time a predetermined time (for example, several seconds or several minutes) elapses.

  As shown in FIG. 2, the housing 50 has an internal space 50 a having a predetermined size in the shape of a hollow rectangular parallelepiped, and an opening 54 continuous with the internal space 50 a. Furthermore, the housing 50 includes a lid portion 56 that is airtightly assembled to the opening 54 of the housing 50 via a packing 58. The housing 50 is made of a metal such as iron or stainless steel.

  The lid 56 is airtightly attached to the opening 54 via the packing 58. More specifically, a housing side flange portion 51 is formed integrally with the housing 50 around the opening 54, and the housing side flange portion 51 has a plurality of through holes. In addition, the packing 58 has substantially the same shape as the housing-side flange portion 51, and the packing 58 has a plurality of holes at the same positions as the plurality of through holes formed in the housing-side flange portion 51. A through hole is formed.

  The lid portion 56 has a concave cross-sectional shape, and a lid-side flange portion 57 is formed around the concave opening. The lid side flange portion 57 has substantially the same shape as the housing side flange portion 51. A plurality of through holes are formed in the lid side flange portion 57 so as to correspond to the plurality of through holes formed in the housing side flange portion 51, respectively. In the illustrated example, the number of through holes formed in the housing side flange portion 51, the lid side flange portion 57, and the packing 58 is four so as to correspond to these four corners.

  In the illustrated example, the lid portion 56 is securely assembled by a bolt / nut 62 that penetrates the through-holes of the lid-side flange portion 57, the packing 58, and the housing-side flange portion 51. Since the packing 58 is sandwiched between the housing side flange portion 51 and the lid side flange portion 57, the lid portion 56 and the housing 50 are assembled in an airtight manner, that is, in a sealed state.

  The detector 32 of the electrical apparatus 10 for radioactive substance management facility and the moisture absorbers 32b and 34b of the preamplifier 34 are handled as follows.

  First, the inspector completely loosens the bolt 62 outside the management area, unscrews the bolt and nut, and opens the lid 56.

  Next, the inspector arranges the moisture absorber 25 and the humidity sensor unit 26 in the internal space 50 a of the housing 50.

  Next, the packing 58 is disposed on the casing side flange portion 51, and the lid side flange portion 57 is further disposed on the packing 58, and the bolts and nuts 62 are securely attached so as to be in an airtight state.

  Then, the inspector installs the casing 50 in which the detector 22, the preamplifier 24, the moisture absorber 25, and the humidity sensor unit 26 are arranged in the internal space 50a in the management area.

  As a result, the detector 22 and the preamplifier 24 start to operate and start detecting radiation in the management area.

  The inspector confirms whether or not the detector 22 and the preamplifier 24 are operating normally by the humidity measured by the humidity sensor unit 26 displayed on the display unit 43.

  The inspector can easily grasp the degree of aged deterioration of the moisture absorber 25 from these humidity.

  As described above, the housing 50 provided with the detector 22 and the preamplifier 24 of the radioactive substance management facility electrical apparatus 10 in the internal space 50a is further provided with the humidity sensor unit 26 in the internal space 50a. Since the humidity of the internal space 50a can be grasped, the replacement time of the moisture absorber 25 can be predicted.

(Second Embodiment)
Referring to FIGS. 3 and 4, an electrical apparatus for a radioactive material management facility according to the present invention is generally indicated by reference numeral 10 a.

  In the electrical device 10 for radioactive substance management facility of the first embodiment, the moisture absorber is disposed outside the casing of the detector 22 and the preamplifier 24, but the electrical device 10a for radioactive material management facility of the second embodiment. The moisture absorber is arranged in the housing of the detector 22 and the preamplifier 24.

  As shown in FIG. 3, the radioactive substance management facility electrical apparatus 10 a is a radiation measurement apparatus, and is installed in the radioactive substance management facility 100 to detect radiation and output from the detector 32. And a preamplifier 34 for amplifying a very small current.

  In the internal space 70a of the casing 80a of the detector 32, there are an electronic device part 32a as an electronic device constituting an electronic circuit for detection, and a moisture absorber such as silica gel that prevents the electronic device part 32a from malfunctioning due to moisture. 32b and the humidity sensor part 32c are accommodated.

  The humidity sensor section 32c of the detector 32 measures the humidity of the internal space 70a of the detector 32, and uses the measured humidity data as a cable to the preamplifier 34, an output signal line for humidity data inside the cable 29, and In addition, it is configured to output to the display unit 43 via the control calculation unit 41 of the central control room 40 installed outside the management area. The inspector can monitor whether the humidity value of the internal space 70a of the detector 32 is abnormal or not by the display on the display unit 43 outside the management area.

  Similarly, in the internal space 70b of the housing 80b of the preamplifier 34, moisture such as silica gel that prevents the electronic device part 34a as an electronic device constituting the electronic circuit for the preamplifier from malfunctioning due to moisture. The absorber 34b and the humidity sensor part 34c are accommodated.

  The humidity sensor part 34c of the preamplifier 34 measures the humidity of the internal space 70b of the preamplifier 34, and the measured humidity data is installed outside the output signal line for the humidity data inside the cable 29 and the management area. It is configured to output to the display unit 43 via the control calculation unit 41 of the central control room 40. The inspector can monitor whether the humidity value of the internal space 70b of the preamplifier 34 is abnormal or not by the display on the display unit 43 outside the management area.

  The control calculation unit 41 is configured to receive a measurement value of the humidity inside the detector 32 and the preamplifier 34 output via the output signal line for humidity data inside the cable 29.

  The memory | storage part 44 is comprised so that the log | history of the measured value from the humidity sensor parts 32c and 34c can be memorize | stored. The control calculation unit 41 is configured to be able to calculate the replacement time of the moisture absorbers 32b and 34b based on the history of measurement values stored in the storage unit 44. The notification unit 45 is configured to notify the replacement time calculated by the control calculation unit 41. For example, the notification unit 45 notifies the inspector that the replacement time has approached the display unit 43 by display or voice.

  As shown in FIG. 4, the detector 32 includes a casing 80a having an internal space 70a having a predetermined size in the shape of a hollow rectangular parallelepiped and having an opening 84 continuous with the internal space 70a. A lid portion 86 that is airtightly assembled to the opening portion 84 of the housing 80a through packing. Although not shown, the preamplifier 34 also includes a housing and a lid portion similar to the detector 32.

  The lid portion 86 is hermetically attached to the opening portion 84 via the packing 88. More specifically, a housing side flange portion 81 is formed integrally with the housing 80a around the opening 84, and the housing side flange portion 81 has a plurality of through holes. The packing 88 has substantially the same shape as the housing-side flange portion 81, and the packing 88 has a plurality of holes at the same positions as the plurality of through holes formed in the housing-side flange portion 81. A through hole is formed.

  The lid portion 86 has a concave cross-sectional shape, and a lid-side flange portion 87 is formed around the concave opening. The lid side flange portion 87 has substantially the same shape as the housing side flange portion 81. A plurality of through holes are formed in the lid side flange portion 87 so as to correspond to the plurality of through holes formed in the housing side flange portion 81, respectively. In the illustrated example, the number of through holes formed in the housing side flange portion 81, the lid side flange portion 87, and the packing 88 is four so as to correspond to those four corners.

  In the illustrated example, the lid portion 86 is securely assembled by a bolt / nut 92 that passes through the through holes of the lid side flange portion 87, the packing 88, and the housing side flange portion 81.

  The detector 32 of the radioactive material management facility electrical apparatus 10a and the moisture absorbers 32b and 34b of the preamplifier 34 are handled as follows.

  First, the inspector completely loosens the bolt 92 outside the management area, unscrews the bolt and the nut, and opens the lid portion 86 of the detector 32 and the preamplifier 34.

  Next, the inspector arranges the moisture absorbers 32 b and 34 b inside the detector 32 and the preamplifier 34.

  Next, the inspector again arranges the packing 88 on the casing-side flange portion 81 and further arranges the lid-side flange portion 87 on the packing 88 so as to ensure that the bolt and nut 92 are in an airtight state. Install.

  Then, the inspector installs the detector 32 and the preamplifier 34 in the management area.

  As a result, the detector 32 and the preamplifier 34 start operating, and start detecting radiation in the management area.

  The inspector confirms whether or not the electronic device parts 32a and 34a inside the detector 32 and the preamplifier 34 are operating normally by the humidity measured by the humidity sensor parts 32c and 34c displayed on the display part 43. .

  The inspector can easily grasp the degree of aging of the moisture absorbers 32b and 34b from these humidity.

  As described above, the detector 32 and the preamplifier 34 of the electrical apparatus 10a for radioactive substance management facility are provided with the humidity sensor parts 32c and 34c in the internal spaces 70a and 70b, respectively, so that the humidity inside the detector 32 is grasped. It is possible to predict the replacement time of the moisture absorbers 32b and 34b.

(Other embodiments)
Although the humidity sensor unit 26 has been described as being configured by one humidity sensor unit in one housing 50, the present invention is not limited to this, and a plurality of humidity sensor units, particularly 3 You may provide the above humidity sensor parts. By doing so, when there is a difference between the measured values of the plurality of humidity sensor units exceeding a predetermined value, it is possible to notify that any of the plurality of humidity sensor units is abnormal. The person can detect the failure of the humidity sensor part at an early stage.

  Further, as in the first embodiment, the humidity sensor unit 32c has been described as being configured by one humidity sensor unit in one housing 80a, but is not limited thereto, and a plurality of humidity sensor units 32c are not limited thereto. You may provide a humidity sensor part, especially three or more humidity sensor parts. By doing so, when there is a difference between the measured values of the plurality of humidity sensor units exceeding a predetermined value, it is possible to notify that any of the plurality of humidity sensor units is abnormal. The person can detect the failure of the humidity sensor part at an early stage. Similarly, the humidity sensor unit 34c may include a plurality of humidity sensors.

  Further, if the humidity sensor unit is composed of three or more humidity sensor units, two or more approximate measurement values of the measurement values of the three or more humidity sensor units can be estimated as humidity. In general, there is almost no possibility that the humidity sensor part manufactured at the same time will fail at the same time. Therefore, even if one humidity sensor unit fails, measured values from two or more approximate humidity sensor units among the three or more humidity sensor units can be handled as normal measured values.

  In addition, although it has been described that the humidity sensor unit 26 is provided in the internal space 50a of the housing 50, the present invention is not limited to this, and further, an imaging unit is provided in the internal space 50a of the housing 50, so that the moisture absorber is deteriorated over time. May be confirmed by an image.

  In addition, a display unit that displays the humidity value measured by the humidity sensor unit 26 may be provided in the internal space 50 a of the detector 22 so as to be visible from the outside of the housing 50.

  The housing 50 may be formed of a material that can be visually recognized as a whole, for example, acrylic, or provided with a window portion having a size that allows the moisture absorber 25 to be visually recognized from the outside of the housing 50. Alternatively, the moisture absorber 25 may be made visible by sealing with a permeable member such as alkali.

DESCRIPTION OF SYMBOLS 10, 10a Electric equipment 20 for radioactive substance management facilities Radiation measuring device 21 Electronic equipment 22 Detector 24 Preamplifier 25 Moisture absorber 26 Humidity sensor part 32 Detector 32a Electronic equipment part 32b Humidity absorber 32c Humidity sensor part 34 Preamplifier 34a Electronic equipment Unit 34b moisture absorber 34c humidity sensor unit 40 central control room 41 control calculation unit 42 instruction unit 43 display unit 44 storage unit 45 notification unit 50 housing 50a internal space 70a internal space 70b internal space 80a housing 80b housing 100 radioactive substance Management facility 110 Storage box

Claims (5)

A housing arranged in a radioactive material management facility;
An electronic device disposed inside the housing;
A moisture absorber disposed inside the housing and absorbing moisture inside the housing;
A humidity sensor unit that is disposed inside the housing and detects humidity inside the housing;
A display unit for displaying humidity data detected by the humidity sensor unit;
A storage unit for storing measurement values from the humidity sensor unit;
A control calculation unit that calculates a replacement time of the moisture absorber based on a history of measurement values from the humidity sensor unit;
A notification unit for notifying the replacement time calculated by the control calculation unit ,
The humidity sensor unit is composed of a plurality of humidity sensors,
The control calculation unit, when the measured value of the plurality of the humidity sensors is a difference beyond a predetermined value from each other, radioactive materials management facility for electric you informed that any of the plurality of the humidity sensors is abnormal apparatus. A housing arranged in a radioactive material management facility;
An electronic device disposed inside the housing;
A moisture absorber disposed inside the housing and absorbing moisture inside the housing;
A humidity sensor unit that is disposed inside the housing and detects humidity inside the housing;
A display unit for displaying humidity data detected by the humidity sensor unit;
A storage unit for storing measurement values from the humidity sensor unit;
A control calculation unit that calculates a replacement time of the moisture absorber based on a history of measurement values from the humidity sensor unit;
A notification unit for notifying the replacement time calculated by the control calculation unit ,
The humidity sensor unit is composed of three or more humidity sensors,
The control calculation unit among the measurement values of the three or more humidity sensors, you and the humidity of two or more measurements that approximates radioactive material storage facility for electric devices. The electrical device for a radioactive substance management facility according to claim 1 or 2 , wherein the output signal line of the humidity sensor section passes through a cable through which the output signal line of the electronic device passes. An electronic device monitoring method for an electrical device for a radioactive material management facility according to claim 1 ,
A measuring step for detecting the humidity inside the housing;
A display process for displaying detected humidity data;
An electronic device monitoring method comprising: a notifying step for notifying that any of the plurality of humidity sensors is abnormal when measured values of the plurality of humidity sensors exceed a predetermined value. An electronic device monitoring method for an electrical device for a radioactive substance management facility according to claim 2 ,
A measuring step for detecting the humidity inside the housing;
An electronic device monitoring method comprising: a display step of displaying, as the humidity, two or more approximate measurement values among the measurement values of the three or more humidity sensors.

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