JPH0359390B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sampling device for detecting radioactivity leakage in a pit storing radioactive materials, etc., and relates to a remotely controlled sampling device that enables sampling around any pit. It is.

Generally, the various types of sampling that are carried out in factory equipment are either fixedly installed at specific locations on the factory equipment, or workers visit the site periodically to take samples, but the sampling points are very limited. In some cases, it may be impossible to visually inspect, or workers may not be able to enter. In particular, to detect radioactivity leaks in storage pits that store a large number of canisters etc. sealed with radioactive materials, workers cannot enter and must use remote control, but it is possible to detect radioactivity leaks by removing the lid of the storage pit, etc. For example, although it is possible to detect radioactivity leakage in the surrounding area, it is impossible to detect from which of the many stacked canisters the leakage is coming from.

This invention was made in view of the above-mentioned circumstances, and it is possible to sample and inspect the surrounding fluid at any position, even in cases where workers are not allowed to enter, without having to fix it at the position where sampling is required. The present invention provides a remotely controlled sampling device configured as follows.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. The attached drawing is
The present invention provides a remotely operated sampling device for collecting air around any pit as a sampling fluid in a storage pit in which a large number of sealed canisters containing radioactive materials are stacked and stored. FIG. 1 is a cross-sectional view of the main parts showing a sampling state by remote control according to the present invention.
A large number of storage pits are stacked and stored in a storage chamber 3 provided in the storage chamber 3, and a storage pit floor plug 4 is provided on the top surface of each storage chamber
A lid body such as the above is fitted.

Inside the storage chamber 3, a storage guide 5 is provided so that the canisters 1 can be stacked accurately in the center.
Four storage guides 5 are installed, and the canister 1 is guided and stored inside these four storage guides 5. The upper end of the storage guide 5 is connected to a storage pit floor plug 4.
As shown in FIG. 3, a predetermined clearance is provided between the storage guide 5 and the storage chamber 3 at its outer periphery.

Further, the storage guide 5 is fixed and positioned via fixing rings 6 and brackets 7 provided on the storage pit 2 at appropriate intervals.

Reference numeral 10 designates a sampling device according to the present invention, and as shown in FIGS. 3 to 5, it is mounted on a traverser (not shown), moves freely left and right, and back and forth, and is set on the upper surface of a predetermined storage chamber 3. A sampling monitor chamber 12 is installed on the lower surface of the stand 11 of the sampling device 10, and a monitor having the same shape and mounting position as the storage guide 5 installed in the storage chamber 3 is installed in this monitor chamber 12. Four main body guides 13 are installed.

A predetermined clearance is provided between the sampling monitor chamber 12 and the monitor main body guide 13, and as shown in FIGS. The monitor body guide 1 has an opening 15a inside and is guided by guide rollers 14 installed on both sides.
The sampling monitor main body 15, which moves up and down by rolling on three sides, serves as a sampling and lifting tube 16.
It is fixed and suspended from the lower end of the.

The upper end of the sampling/lifting tube 16 extends above the stand 11 and is wound onto a winding drum 18 via an idler 17.

Four sampling monitor bodies 15 are provided correspondingly between the monitor body guides 13, and each of them is connected to the base 11 by a sampling/lifting tube 16.
It is wound up on the upper four winding drums 18.
The four winding drums 18 are synchronized in the same direction by bevel gears (not shown) provided at the tips of a pair of drive shafts 21 driven by a motor 19 installed in the center via a gearbox 20. It is designed to be rotated.

Further, a fluid outlet 22 is installed on the side opposite to the drive shaft side of the winding drum 18, and communicates with a sampling chamber 23 in pairs.

As shown in FIG. 6, the sampling and lifting tube 16 has a flat winding surface 16a formed by molding a wire 24 on the side in contact with the winding drum 18. A concave thread groove 18a is formed so that the upper tube 16 can be wound in a single layer at the same pitch.

As shown in FIG. 7, the winding drum 18 has an outer periphery of a drum flange 27 engaged with a rack 26a formed inside the top beam 26 of the drum supports 25, 25. Further, the winding drum 18 is fixed to the rotating body 29 through a linear ball bearing 28 fitted in a bearing seat 28 attached to the drum flange 27, and the drum support 25,
It is adapted to slide left and right on a drum support shaft 30 rotatably mounted on the drum 25. That is,
A drive shaft 31 to which rotational force from the motor 19 is transmitted is fixed to one of the rotating bodies 29, and a fluid outlet 22 is fixed to the outside of the other rotating body 29 via a rotary fluid coupling 32. An expansion joint 33 is installed inside the expansion joint 3.
The side opposite to the fluid outlet 22 of No. 3 is a drum flange 27.
It is inserted into the winding drum 18 from one side thereof, and the end of the sampling/lifting tube 16 wound around the winding drum 18 is connected to its end. Therefore, when the drive shaft 31 is rotated, the winding drum 18 is rotated via the support shaft 30, and the sampling and lifting tube 16 is wound onto or unwound onto the winding drum 18, and the above-mentioned operations are performed. The outer periphery of the drum flange 27 engages and slides with the rack 26a formed inside the ceiling beam 26, thereby moving the winding drum 18 to the left or right, and keeping the sampling/lifting tube 16 always at the center. Winding drum 18
It is designed to be wound in a single layer or rewound.

Next, a sampling operation for detecting whether there is radioactivity leakage from the canister 1 inside the storage pit constructed as described above will be explained.

Further, the traverser is moved by remote control, the sampling device 10 is positioned above the storage chamber 3 of the desired storage pit, and the storage pit floor plug 4 is removed.
Match. Next, the motor 19 is driven to lower the sampling/lifting tube 16 wound around the winding drum 18, and the sampling monitor main body 15 is lowered and stopped at the canister 1 at an arbitrary position. Air opening 15
The sampling fluid is sucked continuously or intermittently from a, enters the sampling chamber 23 via the sampling/lifting tube 16, is sucked by a suction pump (not shown), and is sent to a sampling device (not shown).

By the above-described operation, sampling can be freely performed at any position of the canister 1 within the storage pit 2 by remote control.

The remote-controlled sampling device according to the present invention configured as described in detail above has the following features.

Since the storage guide, which supports the object to be inspected such as a canister, and the monitor body guide have the same cross-sectional shape, the sampling monitor body can be easily transferred to the storage guide by positioning the sampling monitor body only in the vertical direction. Sampling can be performed at any position.

Sampling accuracy is high because it is possible to sample not only one direction but also the entire surrounding area of the object to be inspected, such as a canister.

If the storage guide is fixed at any position in the upper and lower longitudinal directions using a bracket and a fixing ring, the sampling monitor body can be raised and lowered without any trouble even if the entire guide has some waviness.

Since the sampling monitor main body moves along the storage guide, there is no problem even if the canister is stored off-center.

Since wire is molded into the sampling/lifting tube, it will not collapse even when wound up on the take-up drum, allowing the fluid to be sent without any hindrance.

Since it serves both as a sampling tube for lifting heavy objects and for sending fluids, sampling can be performed at any location.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a sampling state by remote control according to the present invention, FIG. 2 is a vertical cross-sectional view of a sampling device according to the present invention, and FIG.
A sectional view taken along the line A-A in the figure, Figure 4 is a top view of Figure 1,
5 is a side view of the sampling device of FIG. 1, FIG. 6 is a sectional view of a sampling and lifting tube according to the invention, and FIG. 7 is a sectional view of a winding drum according to the invention. 1...canister, 2...storage pit, 3...
Storage chamber, 4... Storage pit floor plug, 5... Storage guide, 6... Fixed ring, 7... Bracket, 10... Sampling device, 11... Unit, 1
2... Sampling monitor chamber, 13... Monitor body guide, 14... Guide roller, 15... Sampling monitor body, 16... Sampling and lifting tube, 18... Winding drum, 19... Motor, 21... ...Drive shaft, 22...Fluid outlet, 23...Sampling chamber.

Claims (1)

[Claims] 1. Canisters containing sealed radioactive materials, etc. are stored stacked in multiple stages in the storage chamber of a storage pit via a storage guide, and a monitor body guide with the same shape and mounting position as the storage guide, and a sampling/hanging A sampling monitor body suspended by an upper tube, a winding drum that winds up the sampling and lifting tube, a drive motor for the winding drum, and a sampling channel that collects the fluid sent by the sampling and lifting tube. A sampling device consisting of a canister, etc. is attached to a traverser that is moved by remote control, the sampling device is positioned above a predetermined storage chamber, and the sampling monitor body is suspended to suck in the sampling fluid around the desired canister. A remote-controlled sampling device characterized by being configured as follows.