JP2011226997A - Calibration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a calibration device capable of accurately calibrating a detection unit of a vertical type laundry monitor that monitors a work uniforms put on a hanger.SOLUTION: A calibration device 100 comprises a transport unit that transports a work uniform with a hanger by moving a mobile hook to hook a hanger with a work uniform hung thereon and a vertical type laundry monitor where a radiation detection unit thereof detects the presence of contamination by monitoring a work uniform carried in through a side entrance formed to have a concave lateral shape. The calibration device 100 is used for a monitoring system to detect the presence of radioactive contamination on a work uniform carried out from a control area of a radioactive material handling facility and performs a calibration operation for the detection unit while being hung from the mobile hook of the transport unit and transported along with the mobile hook.

Description

  The present invention relates to a calibration jig for a land remonitoring system including a vertical land remonitor for inspecting whether or not work clothes carried out from a management area of a radioactive material handling facility such as a nuclear power plant are contaminated with radioactive material (radioactive contamination). About.

  For example, Patent Document 1 (Japanese Patent Application Laid-Open No. Hei 6-148337, title of invention: radioactive contamination monitor calibration method and radiation source fixing jig used therefor) describes a conventional technique related to a calibration jig for a landry monitor. Is known. The radiation source fixing jig of Patent Document 1 is a radiation source fixing jig for calibrating a landry monitor that performs monitoring on a landry conveyed on a conveyor.

JP-A-6-148337 (paragraph numbers [0023] to [0030], FIG. 4)

  In the prior art described in Patent Document 1, the radiation source fixing jig is transported on the conveyor, and since the distance from the radiation source to the detection unit is a fixed length, accurate calibration was possible. . However, in a vertical landry monitor that inspects for contamination by radioactive substances (radioactive contamination) with work clothes suspended by a hanger, if a suspended calibration jig is used, the longitudinal direction (with respect to the transport direction) In other words, the work clothes swayed in the vertical direction) and in the left-right direction (conveyance direction), and the distance from the radiation source to the detection unit changed, and there was a problem that accurate calibration could not be performed.

  Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to perform a calibration process for performing a reliable calibration on a detection unit of a vertical landry monitor that monitors work clothes on a hanger. It is in providing tools.

In order to solve the above-described problem, the calibration jig according to the first aspect of the present invention provides:
The movement hook that hangs the hanger on which the work clothes are hung is moved to convey the work clothes together with the hanger, and the work clothes carried in through the side entrance formed in a concave shape when viewed from the side are irradiated with radiation. The Landry Monitor System has a vertical landry monitor that monitors the detection unit to detect the presence or absence of contamination, and inspects the presence of contamination by radioactive materials in work clothes carried out from the management area of the radioactive material handling facility. A calibration jig used,
A calibration jig that is suspended from the moving hook of the transfer unit, moves along with the transfer of the moving hook while holding the radiation source, and passes through the detection unit of the vertical land monitor disposed on the transfer path. It is a tool.

The calibration jig of the invention according to claim 2 of the present invention is
The calibration jig according to claim 1,
A main body formed in a vertically long direction;
A radiation source holding portion that is attached to the main body and to which the radiation source is fixed;
A hook fixing portion that is attached to the upper side of the main body and is fixed to the moving hook of the transport portion;
An upper guide portion that is attached to the upper side of the main body, and that contacts the front inner wall surface on which the front detection unit of the vertical landry monitor is formed and the rear inner wall surface on which the rear detection unit is formed;
A lower guide portion that is attached to the lower side of the main body, and that abuts against a front inner wall surface on which a front detection portion of a vertical land-line monitor is formed and a rear inner wall surface on which a rear detection portion is formed;
It is characterized by providing.

Moreover, the calibration jig of the invention according to claim 3 of the present invention is
In the calibration jig according to claim 2,
The upper guide portion includes a front roller that contacts the front inner wall surface, and a rear roller that contacts the rear inner wall surface. The lower guide portion includes a front roller that contacts the front inner wall surface, and a rear inner surface. And a rear roller in contact with the wall surface.

Moreover, the calibration jig of the invention according to claim 4 of the present invention is
In the calibration jig according to claim 2 or claim 3,
The upper guide portion includes a guide portion that guides into the carry-in port of the vertical land remonitor,
The lower guide portion includes a guide portion that guides into the carry-in port of the vertical landry monitor.

Moreover, the calibration jig of the invention according to claim 5 of the present invention is
In the calibration jig according to any one of claims 2 to 4,
The hook fixing portion includes a hole portion formed substantially the same as the shape of the moving hook of the transport portion, and a fixing screw reaching the hole portion, and is fixed integrally with the moving hook by fastening the fixing screw. It is characterized by that.

The calibration jig of the invention according to claim 6 of the present invention is
In the calibration jig according to any one of claims 2 to 5,
The front side detection unit and the rear side detection unit are formed by arranging a plurality of sensor units in the vertical direction, and the calibration jig is
Protruding portions provided on both side surfaces of the main body, and provided in multiple stages in the vertical direction;
A locking portion provided on both side surfaces of the radiation source holding portion and locked to the protruding portion,
The radiation source holding part can be arranged in multiple stages with respect to the main body part, and the radiation source is calibrated for each sensor according to the height of one sensor.

  According to the present invention as described above, it is possible to provide a calibration jig that performs reliable calibration on a detection unit of a vertical landry monitor that monitors work clothes on a hanger.

1 is a system configuration diagram of a Landry monitor system to which a calibration jig according to an embodiment for carrying out the present invention is applied. It is explanatory drawing explaining the detection part of a vertical landry monitor. It is explanatory drawing explaining the detection part of a vertical landry monitor. It is explanatory drawing explaining the circuit block of a vertical landry monitor. It is explanatory drawing of the calibration jig | tool of the form for implementing this invention, Fig.5 (a) is a top view, FIG.5 (b) is a front view, FIG.5 (c) is an enlarged view of a hook fixing | fixed part. It is a perspective appearance figure of a calibration jig of a form for carrying out the present invention. It is explanatory drawing explaining the movement of the conveyance direction of the calibration jig | tool of the form for implementing this invention. It is explanatory drawing explaining the position of the up-down direction of the radiation source of the calibration jig | tool of the form for implementing this invention.

Then, the form for implementing this invention is demonstrated, referring a figure. First, a Landry monitor system using a calibration jig will be described.
As shown in FIG. 1, the landry monitor system 1 includes a vertical landry monitor 10, a loading unit 20, a transport unit 30, and a storage unit 40.

  As shown in FIG. 2, the vertical landry monitor 10 is formed with a conveyance path 11 having an upper side opened when viewed from above. The vertical landry monitor 10 is formed in a substantially concave shape because of the conveyance path 11 when viewed from the side. Thus, since the substantially concave-shaped conveyance path 11 is adopted, the work clothes 2 suspended from the upper side by the conveyance unit 30 can be passed as they are. A carry-in port 11 a is provided on the upstream side of the transfer path 11, and a carry-out port 11 b is provided on the downstream side of the transfer path 11.

The carry-in entrance 11a is an entrance into the vertical landry monitor 10 as shown in FIG.
The conveyance path 11 is a space that communicates with the carry-in entrance 11a, and the upstream front side detection unit 12, the downstream front side detection unit 13, and the upstream rear side so as to face the back side and the front side of the work clothes 2 on both sides of the conveyance path 11 A detection unit 14 and a downstream rear side detection unit 15 are arranged.
The carry-out port 11 b communicates with the conveyance path 11 and is an exit from the vertical landry monitor 10.
The work clothes 2 pass through the carry-in port 11a, the conveyance path 11, and the carry-out port 11b in this order.

  As shown in FIG. 2, the vertical landry monitor 10 includes an upstream front detection unit 12, a downstream front detection unit 13, an upstream rear detection unit 14, and a downstream rear detection unit 15. Here, the front side refers to the front side of the vertical landry monitor 10 as seen in FIG. The rear side refers to the back side of the vertical landry monitor 10. The upstream side is upstream with respect to the transport direction, and the downstream side is downstream with respect to the transport direction. The upstream front detection unit 12 and the downstream front detection unit 13 are formed on the front inner wall surface 16 of the vertical landry monitor 10. The upstream rear side detection unit 14 and the downstream rear side detection unit 15 are formed on the rear inner wall surface 17 in the vertical landry monitor 10.

  And as shown in FIG. 3, a some sensor part is provided in an up-down direction. This arrangement is also the same for the upstream front detection unit 12 and the downstream front detection unit 13. In the present embodiment, for example, seven sensor units in the vertical direction of the upstream rear side detection unit 14 and six sensor units in the vertical direction of the downstream rear side detection unit 15 are provided. Although not shown, the upstream front detection unit 12 also includes seven vertical sensor units, and the downstream front detection unit 13 also includes six vertical sensor units. Contamination (radiation) due to radioactive substances on the front and rear surfaces of the work clothes 2 conveyed into the conveyance path 11 by the upstream front detection unit 12, the downstream front detection unit 13, the upstream rear detection unit 14, and the downstream rear detection unit 15 Detection of presence or absence of contamination.

  Further, as shown in FIG. 4, the internal circuit of the vertical landry monitor 10 includes an upstream front detection unit 12, a downstream front detection unit 13, an upstream rear detection unit 14, a downstream rear detection unit 15, and a signal processing unit 18. The operation / display unit 19 includes an upstream front detection unit 12, a downstream front detection unit 13, an upstream rear detection unit 14, a downstream rear detection unit 15, and an operation / display unit 19, respectively. It is connected. The operation / display unit 19 is provided outside the vertical landry monitor 10, and receives various operations and displays various data.

  When input about the presence / absence of contamination of work clothes is input through the operation / display unit 19, the signal processing unit 18 includes an upstream front detection unit 12, a downstream front detection unit 13, an upstream rear detection unit 14, and a downstream rear detection unit. 15 detects the presence or absence of radiation contamination of the work clothes 2 passing through the conveyance path 11 based on the detection signal transmitted from the control unit 15 and transmits a display command notifying the presence or absence of radiation contamination to the operation / display unit 19. The presence or absence of contamination is confirmed by the display on the display unit 19. The vertical landry monitor 10 is like this.

  When the hanger on which the work clothes 2 are hung is set, the input unit 20 moves to the transport unit 30 and inputs the hanger to the moving hook 33 of the transport unit 30.

As shown in FIG. 1, the transport unit 30 includes a support column 31, a transport body 32, and a moving hook 33.
The support column 31 supports the transport body 32 from below.
A ring-shaped chain (not shown) rotates in the transport main body 32, and takes a path on at least the transport path 11 of the vertical land monitor 10.
The moving hook 33 is configured to move together with the chain. The moving hook 33 is also configured to move on the conveyance path 11 of the vertical landry monitor 10. The conveyance part 30 is such.

  The storage unit 40 stores the work clothes 2 that move in the transport unit 30 after sorting. For example, the work clothes 2 are stored in three types of large, medium and small. The storage unit 40 is like this.

  Such a Landry monitor system 1 is used for inspecting whether or not the work clothes 2 used in a radioactive material handling facility such as a nuclear power plant is contaminated with a radioactive material. An outline of the management of the work clothes 2 using the land remonitor system 1 will be described. The throwing unit 20 throws the work clothes 2 hung on the hanger onto the transport unit 30 in a state of being hung on the moving hook 33 of the transport unit 30. The moving hook 33 of the transport unit 30 is moved by the chain, and the work clothes 2 suspended from the hanger are moved together with the hanger. The work clothes 2 suspended from the transport unit 30 are transported into the vertical landry monitor 10 to detect the presence or absence of contamination by radioactive substances. When there is no contamination, the work clothes 2 are transported to the three storage units 40 and collected and stored according to size. The size is determined by, for example, an IC tag attached to a hanger. When there is contamination, the work clothes 2 are stored by being dropped into a storage basket (not shown).

  Next, the calibration jig will be described. As shown in FIGS. 5 and 6, the calibration jig 100 includes a main body portion 101, a radiation source holding portion 102, a hook fixing portion 103, an upper guide portion 104, and a lower guide portion 105.

  The main body 101 is a frame structure that is formed long in the vertical direction (see FIG. 3). The main body 101 is formed in a rectangular shape. The protruding portion 101a is a multi-stage columnar member, and a plurality of protruding portions 101a are provided in the vertical direction on both side surfaces of the main body portion 101.

  The radiation source holding unit 102 includes a holding unit main body 102a and locking portions 102b that are provided on the left and right sides of the holding unit main body 102a and are locked to the protruding portion 101a. The locking portion 102b is configured to include a total of four groove portions in a total of four locations at the top and bottom, which are respectively fitted into four protrusion portions 102 in a total of two locations at the top and bottom. A radiation source (not shown) is fixed to the holder main body 102a. The positions of the radiation source and the detection unit are mechanically designed so as to be a predetermined detection position. Further, the radiation source holding unit 102 can be attached toward the rear side instead of the front side. When facing the front side, the radiation source is also facing the front side, and the front side detector is calibrated. When the light source is directed to the rear side, the radiation source is also directed to the rear side, and the rear detection unit is calibrated.

  The hook fixing portion 103 is attached to the upper side of the main body portion 101 and has a hole portion 103a. As shown in FIG. 5 (c), the moving hook 33 of the transport unit 30 is fitted and locked in the hole 103a of the hook fixing unit 103, and is further firmly fixed by being pressed by the fixing screws 103b on both side surfaces. I do. Further, as is clear from FIG. 5A, the hole 103a is also formed long in the front-rear direction. This prevents the calibration jig 100 from shaking in the front-rear direction and the left-right direction even during conveyance.

  The upper guide part 104 is attached to the upper side of the main body part 101, and is provided so as to contact the front inner wall surface 16 of the vertical landry monitor 10 in which the upstream front detection part 12 and the downstream front detection part 13 are formed. A pair of front rollers 104a, upstream and downstream detection units 14, and downstream rear detection units 15 are provided on the upstream and downstream sides so as to abut on the rear inner wall surface 107 of the vertical land remonitor 10. And a rear roller 104b. Moreover, the guide part 104c which consists of a trapezoid flat plate which makes a pair in upstream and downstream is provided.

  The lower guide portion 105 is attached to the lower side of the main body portion 101 and is provided so as to abut on the front inner wall surface 16 of the vertical landry monitor 10 in which the upstream front detection unit 12 and the downstream front detection unit 13 are formed. The upstream and downstream pairs of front rollers 105a, the upstream rear detection unit 14 and the downstream rear detection unit 15 are provided so as to contact the rear inner wall surface 107 on which the upstream land detection monitor 15 is formed. And a pair of rear rollers 105b. Moreover, the guide part 105c which consists of a flat plate on the trapezoid which makes a pair in upstream and downstream is provided.

Next, calibration using such a calibration jig 100 will be described.
Such a calibration jig 100 can perform a configuration operation in a state where the calibration jig 100 is suspended in the landry monitor system 1 that conveys the work clothes 2 while being suspended on the hanger.

  For calibration, it is necessary to operate the radiation source while keeping a certain distance from the front and back surfaces of the detection unit. If calibration is performed by suspending a calibration jig that does not have an upper guide part or a lower guide part from the conveyance part 30, the calibration jig swings back and forth and left and right, and a certain distance from the front and rear detection parts is not maintained. However, there was a problem that normal calibration could not be performed. The calibration jig 100 of the present invention stabilizes the operation of the calibration jig 100 during calibration in the front-rear direction because the upper guide portion 104 and the lower guide portion 105 abut against the front inner wall surface 16 and the rear inner wall surface 17. The distance from the radiation source to the surface of the detection unit is kept constant to enable normal calibration.

  At the time of calibration, the conveyance unit 30 is stopped without using the loading unit 20, and the calibration jig 100 to which the radiation source 106 (see FIG. 8) is attached is directly attached to the moving hook 33 of the conveyance unit 30. Subsequently, the calibration jig 100 is manually sent into the vertical landry monitor 10.

  Then, as shown in FIG. 7A, the calibration jig 100 is introduced near the carry-in port 11 a of the vertical landry monitor 10. In this case, since the position of the calibration jig 100 is determined by the hook fixing portion 103, the calibration jig 100 is reliably guided into the conveyance path 11. Even if there is a deviation in the front-rear direction, the guide part 104 c on the downstream side of the calibration jig 100 abuts on the carry-in port 11 a of the vertical land monitor 10 and the position in the front-rear direction is corrected, so Is guided in. Subsequently, as shown in FIG. 7B, the front guide rollers 104a, 105a on the downstream side of the upper guide portion 104 and the lower guide portion 105 of the calibration jig 100 and the rear rollers 104b, 105b on the downstream side are vertical types. It contacts the front inner wall surface 16 and the rear inner wall surface 17 of the land monitor 10. At this time, the position is corrected in the front-rear direction.

  Further, as shown in FIG. 7C, the upstream rollers 104a and 105a on the upstream and downstream sides of the upper guide portion 104 and the lower guide portion 105 and the rear rollers 104b and 105b on the upstream and downstream sides are connected to the front inner wall surface 16 and the rear side. It contacts the inner wall surface 17. Thereby, the position in the front-rear direction is determined, and the distance from the radiation source 106 to the detection unit is determined to be equal. For example, as shown in FIG. 7D, the distance from the radiation source 106 to the front inner wall surface 16 of the vertical landry monitor 10 is maintained at a distance a determined in advance for calibration.

  Further, by changing the radiation source holding unit 102 in the vertical direction with respect to the main body unit 101, it is possible to calibrate a large number of sensor units having different height positions. For example, as shown in FIG. 8 (a), the second sensor unit from the top of the upstream rear detection unit 14 is calibrated, and as shown in FIG. 8 (b), the downstream rear detection unit 15 The calibration target can be changed depending on the vertical position, such as calibrating the fourth sensor section from the top. Such calibration requires time and effort such as replacement, but this calibration is not a problem because it takes a long time, for example, once a year. Moreover, it can be set as the calibration jig | tool 100 kept low in cost.

  The calibration jig of the present invention has been described above. In such a calibration jig, even in the case of a vertical landry monitor, since shaking is prevented and accurate positioning is performed, more accurate calibration is realized.

  The calibration jig of the present invention is applied to the calibration of a vertical land remonitor of a land remonitor system installed in a radioactive material handling facility such as a nuclear power plant.

1: Landry monitor system 10: Vertical landry monitor 11: Transport path 11a: Carrying port 11b: Carrying port 12: Upstream front side detection unit 13: Downstream front side detection unit 14: Upstream rear side detection unit 15: Downstream rear side detection unit 16 : Front side inner wall surface 17: rear side inner wall surface 18: signal processing unit 19: operation / display unit 20: loading unit 30: transport unit 31: support column 32: transport body 33: moving hook 40: storage unit 100: calibration jig 101: body portion 101a: protruding portion 102: radiation source holding portion 102a: holding portion body 102b: locking portion 103: hook fixing portion 103a: hole portion 103b: fixing screw 104: upper guide portion 104a: front roller 104b: rear Side roller 104c: Guide part 105: Lower guide part 105a: Front roller 105b: Rear roller 105c: Guide part 2: Work clothes

Claims (6)

The movement hook that hangs the hanger on which the work clothes are hung is moved to convey the work clothes together with the hanger, and the work clothes carried in through the side entrance formed in a concave shape when viewed from the side are irradiated with radiation. The Landry Monitor System has a vertical landry monitor that monitors the detection unit to detect the presence or absence of contamination, and inspects the presence of contamination by radioactive materials in work clothes carried out from the management area of the radioactive material handling facility. A calibration jig used,
A calibration jig that is suspended from the moving hook of the transfer unit, moves along with the transfer of the moving hook while holding the radiation source, and passes through the detection unit of the vertical land monitor disposed on the transfer path. A calibration jig characterized by being a tool. The calibration jig according to claim 1,
A main body formed in a vertically long direction;
A radiation source holding portion that is attached to the main body and to which the radiation source is fixed;
A hook fixing portion that is attached to the upper side of the main body and is fixed to the moving hook of the transport portion;
An upper guide portion that is attached to the upper side of the main body, and that contacts the front inner wall surface on which the front detection unit of the vertical landry monitor is formed and the rear inner wall surface on which the rear detection unit is formed;
A lower guide portion that is attached to the lower side of the main body, and that abuts against a front inner wall surface on which a front detection portion of a vertical land-line monitor is formed and a rear inner wall surface on which a rear detection portion is formed;
A calibration jig characterized by comprising: In the calibration jig according to claim 2,
The upper guide portion includes a front roller that contacts the front inner wall surface, and a rear roller that contacts the rear inner wall surface. The lower guide portion includes a front roller that contacts the front inner wall surface, and a rear inner surface. A calibration jig comprising: a rear roller in contact with the wall surface. In the calibration jig according to claim 2 or claim 3,
The upper guide portion includes a guide portion that guides into the carry-in port of the vertical land remonitor,
The calibration jig according to claim 1, wherein the lower guide portion includes a guide portion that guides into a carry-in entrance of the vertical land-rely monitor. In the calibration jig according to any one of claims 2 to 4,
The hook fixing portion includes a hole portion formed substantially the same as the shape of the moving hook of the transport portion, and a fixing screw reaching the hole portion, and is fixed integrally with the moving hook by fastening the fixing screw. A calibration jig characterized by that. In the calibration jig according to any one of claims 2 to 5,
The front side detection unit and the rear side detection unit are formed by arranging a plurality of sensor units in the vertical direction, and the calibration jig is
Protruding portions provided on both side surfaces of the main body, and provided in multiple stages in the vertical direction;
A locking portion provided on both side surfaces of the radiation source holding portion and locked to the protruding portion,
The calibration jig is characterized in that the radiation source holding part can be arranged in multiple stages with respect to the main body part, and the radiation source is calibrated for each sensor according to the height of one sensor.

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