JP2011196876A - Electric device for radioactive material management facility and electronic apparatus monitoring method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric device for radioactive material management facilities capable of confirming whether or not an internal component is sound without releasing a seal state of a radiation measurement device.SOLUTION: The electric device 10 for radioactive material management facilities includes: a case 50 disposed at the radioactive material management facilities; an electronic apparatus 21 disposed in an internal space 50a of the case 50; and a moisture absorbent 25 disposed in the internal space 50a of the case 50 and absorbing the moisture in the internal space 50a of the case 50. A window part 23 having a size through which the moisture absorbent 25 may be visually recognized from the outside of the case 50 is provided at a part of the case 50. The moisture absorbent 25 is sealed with a transmissive member 23a such as alkali at the window part 23 so that the moisture absorbent 25 may be visually recognized.

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. Further, a lid for putting the hygroscopic agent inside the radiation measuring apparatus is attached to the frame via the packing 58.

  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. Further, when the inspector takes out the internal components of the radiation measuring apparatus, the inspector may inadvertently damage other internal components or circuits or promote deterioration. In particular, since the inside of radioactive material management facilities often has high humidity, in such a situation, forcibly releasing the sealed state of the radiation measurement device is a hygroscopic agent installed inside the radiation measurement device. However, it absorbs moisture inside the radioactive substance management facility, and its utility runs out earlier than the original action 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 includes a window portion having a size capable of visually recognizing the moisture absorber from the outside of the housing, and a permeable portion capable of visually recognizing the moisture absorber from the outside of the housing that seals the window portion. Have.

  Another electrical apparatus for radioactive material management facility according to the present invention is a housing disposed in the radioactive material management facility, an electronic device disposed inside the housing, disposed inside the housing, A moisture absorber that absorbs moisture inside the housing; a photographing unit that is disposed inside the housing and photographs the moisture absorber; and an imaging display unit that displays an image photographed by the photographing unit; Is provided.

  The output signal line of the imaging unit of another electrical equipment for radioactive material management facility according to the present invention passes through a cable through which the output signal line of the electronic device passes.

  In another electrical apparatus for radioactive substance management facility according to the present invention, the imaging unit images the moisture absorber every time a predetermined time elapses, and the imaging display unit includes a plurality of imaging units captured by the imaging unit. The radiological management facility electrical apparatus may further include a control calculation unit that calculates the replacement time of the moisture absorber based on the plurality of imaging.

  In another electrical equipment for a radioactive substance management facility according to the present invention, the electrical apparatus for a radioactive substance management facility further includes a notification unit that notifies in accordance with a notification signal from the control calculation unit, wherein the control calculation unit is continuous among the plurality of imaging. If the degree of change in the two captured images differs greatly from the degree of change in the other two consecutively captured images, replace the former one that has the earlier photographing time. When the replacement moisture absorber imaging of the moisture absorber that has reached the time is taken and the imaging sent from the imaging unit is equivalent to the exchange moisture absorber imaging, the notification unit is informed that the moisture absorber is abnormal You may make it make it.

  An electronic device monitoring method for an electrical apparatus for a radioactive substance management facility according to the present invention stores a photographing step of photographing the moisture absorber and a plurality of images photographed by the photographing unit every time a predetermined time elapses. A recording step and a calculation step of calculating a replacement time of the moisture absorber based on the plurality of imaging.

  In the electronic device monitoring method for an electrical apparatus for a radioactive substance management facility according to the present invention, the degree of change in two imagings that were continuously taken out of the plurality of imagings was further continuously taken. If it is determined in the determination step that the difference is greater than the degree of change of the two imaging, and in the determination step, the imaging with the earlier imaging time out of the former two imaging will be replaced. The replacement target identifying step for imaging the moisture absorber to be replaced, the replacement time arrival determining step for determining whether the imaging sent from the imaging unit is equivalent to the replacement moisture absorber imaging, and the replacement time arrival And a notification step of notifying that the moisture absorber is abnormal when it is determined that they are equivalent in the determination step.

  According to the electrical equipment for a radioactive substance management facility according to the present invention, a window having a size that allows the moisture absorber to be visually recognized from the outside of the casing is sealed, and the moisture absorber that is visible from the exterior of the casing is transparent. Because it has a permeable part, the inspector can visually recognize the state of the moisture absorber through the permeable part without using a new electronic device such as a humidity sensor part, and the sealed casing It can be determined whether or not the humidity inside is appropriate. In addition, if this window part and a permeable part are provided in the electrical apparatus for radioactive substance management facilities which concerns on this invention, monitoring by a humidity sensor part and visual monitoring will be attained.

  Moreover, according to the electrical equipment for radioactive substance management facilities according to the present invention, the imaging unit captures the moisture absorber, and displays the captured image on the imaging display unit, so that the inspector has the moisture absorber. Even without going to the place, the state of the moisture absorber projected on the imaging display unit can be confirmed.

  Further, the photographing unit may photograph the moisture absorber every time a predetermined time elapses, and the display unit may store a plurality of images photographed by the photographing unit. And the electrical apparatus 10a for radioactive substance management facilities is further provided with the control calculation part which calculates the replacement | exchange time of a moisture absorber based on the some imaging. Thereby, the inspector can confirm the condition of the moisture absorber which changes over time for a long time.

  In addition, the control calculation unit, when the degree of change of two consecutively photographed images out of a plurality of images is greatly different from the degree of change of two other continuously photographed images, The imaging with the earlier imaging time of the two imagings is referred to as the replacement moisture absorber imaging of the moisture absorber that has reached the replacement time. By doing so, the control calculation unit can notify that the moisture absorber is abnormal when the imaging sent from the imaging unit is equivalent to the replacement moisture absorber imaging.

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 detector of the electrical apparatus 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 schematic diagram which shows the outline | summary of the another electric equipment for radioactive material management facilities which concerns on this invention. It is a schematic diagram which shows the outline | summary of the another electric equipment for radioactive material management facilities which concerns on this invention. 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.

  The instruction unit 42 is configured to display the amount of radiation detected by the detector 22 based on the current output from the preamplifier 24.

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

  The internal space 50a houses a moisture absorber 25 such as silica gel that prevents the detector 22 and the preamplifier 24 from malfunctioning due to moisture.

  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 | casing 50 is provided with the cover part 56 assembled | attached airtightly to the opening part 54 of the housing | casing 50 via packing.

  As shown in FIGS. 1 and 2, in the present embodiment, the housing 50 has a window portion 23 having a size that allows the moisture absorber 25 to be visually recognized from the outside of the housing 50 in a part of the housing 50. Furthermore, the window 23 is sealed with a permeable member 23a such as alkali so that the moisture absorber 25 is visible. The size of the window 23 is not particularly limited as long as the moisture absorber 25 disposed in the internal space 50a can be visually recognized. For example, the window 23 is provided on the entire side surface on the near side in FIG. May be.

  As shown in FIG. 2, the lid portion 56 is airtightly attached to the opening portion 54 via a 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 moisture absorber 25 of the radioactive substance management facility electrical apparatus 10 is handled as follows.

  First, the inspector completely loosens the bolt 62 outside the management area, unscrews the bolt and the nut, and opens the lid portion 56 of the housing 50.

  Next, the inspector places the moisture absorber 25 in the internal space 50 a of the housing 50. At this time, it is preferable that the moisture absorber 25 be disposed at a position where the moisture absorber 25 is visible from the window portion 23 of the housing 50.

  Next, the packing 58 is disposed again on the housing 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 housing 50 containing the detector 22 and the preamplifier 24 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 the detector 22 and the preamplifier 24 are operating normally by visually observing the state of the moisture absorber 25 through the permeable member 23a. Thereby, the inspector can easily grasp the degree of aging of the moisture absorber 25 without releasing the sealing performance of the housing 50.

  As described above, the housing 50 provided with the detector 22 and the preamplifier 34 of the electrical apparatus 10 for radioactive substance management facility in the internal space 50a includes the window portion 23 and the transparent member 23a that can be visually recognized in the window portion 23. Therefore, it is possible to visually confirm the progress of the aging deterioration of the moisture absorber 25 through the window 23 that can be visually recognized by the inspector.

(Second Embodiment)
As shown in FIG. 3, the radioactive substance management facility electrical apparatus 10 a further includes an imaging unit 27 that images the moisture absorber 25 in the internal space 50 a of the housing 50 of the radioactive substance management facility electrical apparatus 10. Further, the central control room 40 includes a display unit 43 that displays the captured image, and the window unit 23 is omitted.

  In the radioactive substance management facility electrical apparatus 10a, the photographing unit 27 is configured to photograph the moisture absorber 25 every time a predetermined time elapses. The radioactive substance management facility electrical apparatus 10 a includes a storage unit 44 that stores a plurality of images captured by the imaging unit 27. The control calculation unit 41 is also configured to calculate the replacement time of the moisture absorber 25 based on a plurality of imaging. Thereby, the inspector can confirm the situation of the moisture absorber 25 that changes over time over a long time by looking at a plurality of images stored in the storage unit 44.

  The radioactive substance management facility electrical apparatus 10 a further includes a notification unit 45 that notifies an inspector based on a notification signal from the control calculation unit 41. The control calculation unit 41 determines the former 2 when the degree of change of two consecutively photographed images out of a plurality of images is significantly different from the degree of change of two other continuously photographed images. The imaging with the earlier imaging time among the two imaging is defined as the replacement moisture absorber imaging of the moisture absorber that has reached the replacement time. By doing so, the control calculation unit is configured to notify the notification unit 45 that the moisture absorber 25 is abnormal when the imaging sent from the imaging unit 27 is equivalent to the replacement moisture absorber imaging. is doing.

  The photographing unit 27 photographs the moisture absorber 25 in the internal space 50 a of the housing 50, and the photographed image data is installed outside the image data output signal line inside the cable 28 and the management area. The data is output to the display unit 43 via the control calculation unit 41 of the central control room 40. The inspector can monitor whether or not the moisture absorber 25 in the internal space 50a of the housing 50 is abnormal outside the management area with an image on the display unit 43. Therefore, the display unit 43 also functions as an imaging display unit.

  Furthermore, the casing 50 may be provided with a window portion having a size that allows the moisture absorber 25 to be visually recognized from the outside of the casing 50, similar to the electrical device 10 for radioactive substance management facility. The window 23 may be sealed with a permeable member such as alkali so that the moisture absorber 25 can be visually recognized. By doing so, the inspector can inspect the moisture absorber 25 via the permeable member even if a malfunction occurs in the photographing unit 27.

(Third embodiment)
As shown in FIG. 4, the radioactive substance management facility electrical apparatus 10 b is installed in the radioactive substance management facility 100 to detect radiation, and amplifies a very small current output from the detector 32. The preamplifier 34 is provided. In this embodiment, one detector 32 constitutes one electronic device 21, and one preamplifier 34 constitutes one electronic device 21.

  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 the like, and a moisture absorber such as silica gel that prevents the electronic device part 32a from malfunctioning due to moisture. 32b is accommodated. Also in the internal space 70b of the housing 80b of the preamplifier 34, an electronic device part 34a constituting an electronic circuit and the like and a moisture absorber 34b such as silica gel are accommodated.

  The casing 80a of the detector 32 and the casing 80b of the preamplifier 34 are provided with window portions 23 and 23 of a size that allows the moisture absorbers 32b and 34b to be visually recognized from the outside of the casings 80a and 80b, respectively. Furthermore, the window portions 23 and 23 are sealed with permeable members 23a and 23a such as alkali, respectively, so that the moisture absorbers 32b and 34b are visible. The magnitude | size of the window part 23 will not be specifically limited if it is a magnitude | size which can visually recognize the moisture absorbers 32b and 34b arrange | positioned in internal space 70a and 70b.

  The housing 80b of the preamplifier 24 is provided with a window 23 having a size that allows the moisture absorber 34b to be visually recognized from the outside of the housing 80b. Further, the window 23 is made of a transparent member 23a such as alkali. It may be sealed to make the moisture absorber 34b visible. By doing so, the inspector can monitor the moisture absorber 34b from the permeable member 23a.

(Fourth embodiment)
As shown in FIG. 5, the radioactive substance management facility electrical apparatus 10 c is further provided in the detectors 32 of the radioactive substance management facility 100 and the internal spaces 70 a and 70 b of the preamplifier 34. 34d is provided, and the window 23 is omitted.

  The imaging units 32d and 34d of the detector 32 and the preamplifier 34 respectively shoot the moisture absorbers 32b and 34b installed in the internal spaces 70a and 70b of the detector 32 and the preamplifier 24, and connect the captured image data to the cable. It outputs to the display part 43 of the central control room 40 installed outside the management area via the output signal line for image data inside 28. The inspector can monitor whether or not the moisture absorbers 32b and 34b in the internal spaces 70a and 70b of the detector 32 and the preamplifier 34 are abnormal outside the management area with an image on the display unit 43. Therefore, the display unit 43 also functions as an imaging display unit.

  As mentioned above, although embodiment of this invention was described with reference to drawings, these are one Embodiment to the last, Comprising: The technical scope of this invention is not necessarily limited to this.

DESCRIPTION OF SYMBOLS 10 Radioactive substance management facility electrical apparatus 10a Radioactive substance management facility electrical apparatus 10b Radioactive substance management facility electrical apparatus 10c Radioactive substance management facility electrical apparatus 20 Radiation measurement apparatus 21 Electronic device 22 Detector 23 Window 23a Transmissible member 24 Preamplifier 25 Moisture absorber 27 Imaging unit 28 Cable 32 Detector 32a Electronic device unit 32b Moisture absorber 32d Imaging unit 34 Preamplifier 34a Electronic device unit 34b Moisture absorber 34d Imaging 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 (7)

A housing arranged in a radioactive material management facility;
An electronic device disposed inside the housing;
A moisture absorber that is disposed inside the housing and absorbs moisture inside the housing;
The housing includes a window portion having a size capable of visually recognizing the moisture absorber from the outside of the housing, and a permeable portion capable of visually recognizing the moisture absorber from the outside of the housing that seals the window portion. , Having electrical equipment for radioactive material management facilities. 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;
An imaging unit that is arranged inside the housing and images the moisture absorber;
An electrical apparatus for a radioactive substance management facility, comprising: an imaging display unit that displays an image captured by the imaging unit.   3. The radioactive substance management facility electrical apparatus according to claim 2, wherein the output signal line of the imaging unit passes through a cable through which the output signal line of the electronic device passes. The photographing unit photographs the moisture absorber every time a predetermined time elapses,
The electrical apparatus for radioactive substance management facility further includes a storage unit that stores a plurality of images captured by the imaging unit, and a control calculation unit that calculates a replacement time of the moisture absorber based on the plurality of imagings The electrical apparatus for radioactive substance management facilities of Claim 2 or 3 provided with these. Furthermore, a notification unit that notifies in accordance with a notification signal from the control calculation unit,
The control calculation unit, when the degree of change of two consecutively photographed images among the plurality of images is greatly different from the degree of change of two other continuously photographed images, When the imaging of the earlier of the two imaging times is the replacement moisture absorber imaging of the moisture absorber that has reached the replacement time, and the imaging sent from the imaging unit is equivalent to the exchange moisture absorber imaging, The electrical apparatus for a radioactive substance management facility according to claim 4, wherein the notifying unit is notified that the moisture absorber is abnormal. An electronic device monitoring method for an electrical device for a radioactive material management facility according to claim 4,
A photographing step of photographing the moisture absorber every time a predetermined time elapses;
A recording step of storing a plurality of images captured by the imaging unit;
An electronic device monitoring method comprising: a calculation step of calculating a replacement time of the moisture absorber based on the plurality of imaging. A determination step of determining whether a degree of change of two consecutively photographed images out of the plurality of images is greatly different from a degree of change of two other continuously photographed images;
In the determination step, when it is determined that the difference is greatly different, the replacement target specifying step in which the imaging with the earlier imaging time among the two imagings is used as the replacement moisture absorber imaging of the moisture absorber that has reached the replacement time;
An exchange time arrival determination step for determining whether the imaging sent from the imaging unit is equivalent to the exchange moisture absorber imaging,
The electronic device monitoring method according to claim 6, further comprising: a notification step of notifying that the moisture absorber is abnormal when it is determined that the replacement time is equivalent in the replacement time arrival determination step.

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