JPH063228A - Sampling device and sampling method for centrifugal extractor - Google Patents

Abstract

PURPOSE:To sample easily and surely the sample of organic phase/water phase in a centrifugal extractor in a remote control cell through remote control with a manipulator. CONSTITUTION:A sampling device is provided with a sample base 22 freely attached and detached to and from the upper portion of a centrifugal extractor 12, a needle pipe 24 set hanging down so that its low end reaches the liquid pool 20 of an extractor housing 14, a sample box 26 mountable on the sample base 22, a sample bottle holding portion 28 positioned above the top end of the needle pipe 24 in the sample box 26, and a sample bottle pushing-down mechanism 30. A vacuum sample bottle 40 is mounted to the sample bottle holding portion 25, the sample bottle 40 is pierced with the needle pipe 24 by means of the sample bottle pushing-down mechanism 30, and sample liquid is suction-sampled from the liquid pool 20 through the needle pipe 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for sampling a sample from a centrifugal extractor. This technique can be used for sampling from a multistage centrifugal extractor for extracting and separating uranium-plutonium, for example, in the reprocessing step of spent nuclear fuel.

[0002]

2. Description of the Related Art Various extraction devices are used for extracting and separating uranium and plutonium in a spent nuclear fuel reprocessing step. One of them is a centrifugal extractor, which has a structure that quickly separates an aqueous phase and an organic phase after mixing by centrifugal force. This centrifugal extractor is suitable when contact time is particularly short and throughput is to be increased.

In such a centrifugal extractor, in order to measure the concentration of uranium / plutonium after the extraction operation, it is necessary to sample and analyze about 5-10 cc of the liquid in each part during operation.

In the conventional sampling method, the valve under the centrifugal extractor is opened to extract the sample solution from the rotor container into a beaker, and the organic phase in the upper layer of the beaker and the aqueous phase in the lower layer are sampled. I was doing an analysis.

[0005]

The handling of spent nuclear fuel takes place in large remotely operated cells. It is very difficult to carry out the above operation, that is, not only simply opening the valve to extract the sample solution but also sampling the organic phase and the aqueous phase separately from the beaker in which the sample solution is stored by remote operation with the manipulator. It was difficult. Therefore, there has been a problem that the sample (liquid) cannot be actually sampled from the centrifugal extractor.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to easily and reliably sample a sample of an organic phase / water phase in a centrifugal extractor in a remote-controlled cell by remote operation by a manipulator. Apparatus and method.

[0007]

DISCLOSURE OF THE INVENTION The present invention is directed to a detachable sample table provided on an upper part of a centrifugal extractor, a needle tube vertically arranged so that a lower end thereof reaches a liquid pool of a centrifugal extractor housing, and a sample table. A sampling device for a centrifugal extractor, comprising: a sample box that can be mounted on a sample bottle; and a sample bottle holding portion located above the upper end of the needle tube in the sample box and a sample bottle pushing down mechanism. Therefore, the centrifugal extractor is also different from the conventional structure, and an upper part is opened in the middle of each organic phase passage and water phase passage in the housing, and a liquid reservoir into which a sampling needle tube can be inserted is provided through the opening. .

In the sampling method using this sampling device, a sample bottle having a vacuum inside is installed in the sample bottle holding portion, and the needle bottle is pierced into the sample bottle by the sample bottle pressing mechanism, and the sample liquid is sucked from the liquid reservoir through the needle tube. To sample.

[0009]

[Function] When a sample bottle with a vacuum inside is installed in the sample bottle holding part in the sample box and pushed down by the sample bottle pushing mechanism, the needle bottle is pierced into the sample bottle and the inside of the sample bottle communicates with the liquid pool. To do. Then, the sample liquid is sucked into the sample bottle from the liquid reservoir through the needle tube due to the pressure difference between the external pressure (cell internal pressure) and the vacuum (sample bottle internal pressure). Since the operation of installing the sample bottle in the sample bottle holding portion and the operation of pushing down the sample bottle are both extremely simple operations, they can be easily performed by remote operation by the manipulator.

[0010]

1 is an exploded perspective view showing an embodiment of a sampling device for a centrifugal extractor according to the present invention, and FIG. 2 is an assembled sectional view thereof. The sampling device 10 is installed above a centrifugal extractor 12 having a plurality of stages. Centrifugal extractor 1
2 includes a motor 14 and a drive unit 1 in the housing 14 here.
It is a four-stage structure with four sets of 8 mounted. A liquid pool 20 is provided in the housing 14. The upper portions of these liquid pools 20 are left open so that sampling can be performed through the openings. The liquid pool 20 is provided in the middle of the organic phase passage and the water phase passage connecting the respective stages of the centrifugal extractor housing 14.

The sampling device 10 is a centrifugal extractor 10.
The sample table 22 is detachably attached to the upper part of the sample table 2 and the sample table 2 is arranged so that the lower end reaches each of the liquid pools 20 of the housing 14.
2, a plurality of needle tubes 24 suspended from the sample tube 26, a sample box 26 that can be placed on the sample table 22, and a sample pot holder 28 that is located above the upper end of the needle tubes 24 in the sample box 26. And a sample bottle pressing mechanism 30. The sample table 22 is
The motor 16 is guided and positioned by the upper cylindrical portion of the motor 16 and fitted therein, and is simply placed. The sampling device 10 is always installed on the centrifugal extractor 12.

The sample table 22 includes needle tubes 24 from the liquid pools 20 in the centrifugal extractor housing 14, respectively.
The sharpened upper end of each needle tube 24 projects above the upper surface of the sample table 22. The periphery of each needle tube 24 is surrounded by a needle tube guide 32 that protects it. The needle tube guide 32 is threaded on the outer periphery of the lower end thereof, and is erected by being screwed onto the thread cut on the upper peripheral surface of the liquid pool 20 of the housing 14. The sample box 26 is divided into an upper part and a lower part, which are connected by a hinge 36 installed on one side so as to be openable and closable. The sample box 26 can be positioned and placed by a guide 38 provided on the outer periphery of the sample table 22.

By opening the upper part of the sample box 26, the sample bottles 40 can be accommodated in the respective sample bottle holders 28. The upper part of the sample box 26 is closed and the operation knob 3 of the sample bottle pressing mechanism 30 is closed.
By pushing down 0a, the internal sample bottle 40 is pushed down. As a result, the sharpened upper end of the needle tube 24 is pierced. Sample bottle 4
0 is composed of a combination of a bottle body made of polyethylene and a rubber lid, for example, and is accommodated in the sample bottle holder 28 upside down (the rubber lid faces downward). In addition, suspenders 42 and 44 are provided at the centers of the sample table 22 and the sample box 26, respectively, to facilitate the attachment / detachment by the manipulator. The protrusion on the upper surface of the sample box 26 is a handle 46 for opening and closing the upper portion.

The method of using this device is as follows. Remote control of manipulator 4
2 is gripped, and the sample table 22 is installed on the centrifugal extractor 12 (specifically, on the motor 16). The upper part of the sample box 26 is opened, a plurality of sample bottles 40 whose inside is evacuated are stored in the respective sample bottle holding parts 28, and the upper part is closed again. Hold the suspending tool 44 of the sample box 26 by remote operation of the manipulator,
The sample box 26 is installed on the sample table 22.
This completes the preparation for sampling.

The sampling operation is performed by pushing down the operation knob 30a of the sample bottle pushing down mechanism 30 by remote operation of the manipulator. The needle tube 24 pierces and penetrates the rubber lid of the sample bottle 40, the vacuum of the sample bottle 40 is broken, and the sample solution is sucked and sampled from the liquid pool 20 in the housing 14 through the needle tube 24. After the sampling is completed, the hanging tool 44 is grasped by the manipulator, only the sample box 26 is removed, and the sample box 26 is directly conveyed to the analyzer. Then, the upper part of the sample box 26 is opened, each sample bottle 40 is taken out, and the sample liquid inside is taken out to perform the necessary analysis.

When the centrifugal extractor itself needs to be maintained or repaired, it can be dealt with as easily as before by grasping the suspending tool 42 and removing the sample table 22 by remote operation of the manipulator.

[0017]

As described above, according to the present invention, the needle tube is provided between the liquid reservoir of the housing and the sample table, and the vacuum sample bottle is installed near the upper end of the needle tube. Since it is configured to pierce and pierce, it is possible to easily and surely sample the organic phase / water phase samples of each stage in the centrifugal extractor in the remote control cell by remote control by the manipulator. In addition, maintenance and repair of the centrifugal extractor body can be performed without any problems.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a sampling device according to the present invention.

FIG. 2 is a sectional view of an embodiment of a sampling device according to the present invention.

[Explanation of symbols]

 10 Sampling Device 12 Centrifugal Extractor 14 Housing 20 Liquid Pool 22 Sample Stand 24 Needle Tube 26 Sample Box 28 Sample Bottle Holding Section 30 Sample Bottle Pressing Mechanism 40 Sample Bottle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tokaio Kawada, Tokai Village, Naka-gun, Naka-gun, Ibaraki Prefecture, 33-4 Muramatsu, Tokai Plant, Reactor and Nuclear Fuel Development Corporation (72) Shinichi Nemoto Tokai-mura, Naka-gun, Ibaraki Prefecture Muramatsu 4-33 33 Reactor and Nuclear Fuel Development Corporation Tokai Works

Claims (3)

[Claims] 1. A detachable sample table provided on an upper part of a centrifugal extractor, a needle tube which is vertically installed so that a lower end thereof reaches a liquid pool of a centrifugal extractor housing, and a sample box mountable on the sample table. A sampling device for a centrifugal extractor, comprising: a sample bottle holding section located above the upper end of the needle tube in the sample box and a sample bottle pushing down mechanism. 2. A centrifugal extractor having a liquid reservoir in which an upper part is opened and a needle tube for sampling is inserted from the upper part opening in an organic phase passage and a water phase passage in a centrifugal extractor housing. 3. The sampling device according to claim 1, wherein the sample bottle holding section is provided with a sample bottle having a vacuum inside, and a needle tube is pierced into the sample bottle by a sample bottle pushing down mechanism, and the sample tube is passed through the needle tube from the liquid reservoir. A sampling method from a centrifugal extractor for suction sampling a sample liquid.