JPH05172712A - Method and apparatus for collecting sample liquid - Google Patents

Abstract

PURPOSE:To enable reliable and efficient collection of a sample liquid by making a detecting means detect the level of the sample liquid in a collecting vessel and by making a control means control the amount of injection of the sample liquid. CONSTITUTION:A liquid transfer pipe 11 transfers to a liquid supply nozzle 15 a permeation liquid obtained by feeding a sample liquid from a test liquid preparing means A into a column test tank 7. A liquid control means 12 controls supply and stop of the liquid and a control part 12a, a three-way valve 12b making the sample liquid flow down to a nozzle 15 or a branch pipe 13, and a control valve 12c, are disposed as the means. A first liquid level detecting means 17, which is fitted to a nozzle elevating means 14, detects whether a liquid level inside a collecting vessel D reaches a set liquid level or not in the case when the vessel D is disposed at a sample liquid collecting position, and transmits a detection signal to the liquid control means 12. A second liquid level detecting means 18 detects whether the sample liquid is put in the vessel D or not when the vessel D is disposed at a position preceding the collecting position, and based on the detection, a vessel replacing means 16 is operated or stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sample liquid collecting method and a collecting device.

[0002]

2. Description of the Related Art High-level radioactive waste (waste liquid, etc.) generated in facilities related to a nuclear power plant can be improved in handleability, for example, by vitrification treatment.

A solidification package (canister) containing glass solidified material in a container is placed in an artificially constructed radioactive waste storage facility to prevent radiation contamination until radiation emission is significantly reduced. In addition to long-term storage and storage, it is planned to be stored in deep geological formations and isolated from the living area.

[0004] In this plan of deep geological disposal, it is possible to suppress the migration and diffusion of radionuclides by utilizing the nature of natural rocks, but it is not possible to completely understand the state of rocks in deep underground. Based on this, it is considered practical to control the leakage of radionuclides by using artificial structures. Further, in the plan, it is effective to use borosilicate glass as a solidified body, use a stainless steel alloy as a storage container to form a solidified package (canister), and use metal and ceramics as an overpack material. It is said that.

Further, in the solidified package in which radioactive waste is confined, rock is excavated to open a disposal hole, a suitable amount of a cushioning material made of bentonite is laid on the bottom of the disposal hole, and carbon steel or the like is placed thereon. Place the canister in a hermetically sealed state with an overpack made of a metal material,
After filling the cushioning material around the overpack to form the cushioning layer, the disposal is performed by covering it with the lid.

[0006] When such disposal is performed, when a waterlogging phenomenon occurs from the bedrock due to groundwater flowing in the deep underground, a part of the buffer material swells and the internal pressure of the buffer layer increases, so that water It is possible to prevent the invasion of the and secure the hermeticity.

On the other hand, in the case of bedrock in the deep underground or soil near the geological disposal target site, in consideration of the phenomenon of groundwater inundation, the permeability of these soils and the transfer status of radionuclides, etc. To research beforehand
It is indispensable for the performance evaluation of geological disposal.

[0008] The present invention has been made in view of the above circumstances, and the actual state of the transfer of water and radionuclides in the soil near the geological disposal site or in the artificially constructed isolation wall structure The purpose of the present invention is to reliably and efficiently collect the liquid that has passed through the soil or the test body of the isolation wall structure or other sample liquid to be collected when the test is performed in a state simulated by the environment.

[0009]

In order to achieve such an object, the present invention proposes a sample liquid sampling method and sampling device. In the method of collecting the sample liquid,
A step of detecting whether or not the sampling container at the sample liquid sampling target position is empty in the method of sampling the sample liquid while taking out the sample liquid from the sample liquid generating means and intermittently switching the positions of the plurality of sampling containers A step of injecting the sample solution into an empty collection container, a step of controlling the injection amount of the sample solution, a step of transferring the sample solution collection container in which the sample solution has been injected, and a step of transferring the sample solution to a target position for sample solution collection. And a step of detecting whether or not the sample liquid is contained in the collection container. In a sample liquid collecting device, a liquid transfer pipe for taking out a sample liquid from a test liquid generating means, a liquid control means for controlling the supply and stop of the liquid interposed in the middle of the liquid transfer pipe, and the liquid control Means for injecting a sample liquid into the collection container, which is connected to the means, container replacement means arranged to interlock with the liquid control means to intermittently switch the position of the collection container, and a sample liquid collection target connected to the liquid control means The first liquid level detecting means for detecting whether or not the sampling container at the position is empty, and the sampling liquid which is connected to the liquid control means and the container replacement means and is transferred to the sample liquid sampling target position is filled with the sample liquid. A configuration including a second liquid level detecting means for detecting whether or not it is present is adopted.

[0010]

In these sample liquid sampling methods and sampling devices, when the first liquid level detecting means detects that the sampling container transferred to the sample liquid sampling target position is empty, Injection is performed while controlling the injection amount of the sample liquid, and the collection container is transferred after the injection. In the sampling container transferred to the sample liquid sampling target position, whether or not the sample liquid is contained is detected by the second liquid level detecting means, and if the sample liquid is not contained, the sampling container is When the sample liquid is transferred to the sample liquid collection target position and the sample liquid is contained, the transfer of the corresponding collection container to the sample liquid collection target position is stopped.

[0011]

1 to 5 show an embodiment in which a liquid permeation test of a test body composed of the soil or the isolation wall structure and the liquid passing through the test body are collected.
In each of these figures, reference numeral A is a test liquid generating means, B is a sample liquid collecting device, C is a water permeation test body, D is a collecting container,
R is a test solution, 1 is a test solution supply system, 2 is a sample solution tank, 3
Is a stirrer, 4 is a metering pump for liquid supply, 5 is a liquid supply pipe, 6 is a condensing pipe, 7 is a column test tank, 11 is a liquid transfer pipe, 12 is a liquid control means, 13 is a liquid branch pipe, and 14 is a nozzle. Lifting means, 15
Is a liquid supply nozzle, 16 is a container replacement means, and 17 is a first
Is a liquid level detecting means, and 18 is a second liquid level detecting means.

In the example shown in FIG. 1, the sample liquid generating means A adds a TRU metal such as ruthenium to the liquid supplied from the test liquid supply system 1 if necessary, and the sample liquid tank 2
The test solution R is temporarily stored in the column test tank 7 by the operation of the stirrer 3 and maintained in a uniform mixed state, and is fed into the column test tank 7 by the supply constant pump 4 via the supply pipe 5 in a fixed amount. In the column test tank 7, a high pressure is applied to the water permeation test body C, and a test equivalent to the amount of groundwater permeation for several hundred years is performed in several hours, and the liquid that permeates the water permeation test body C is used as a sample liquid. The sample is transferred to the downstream sample liquid collecting apparatus B via the liquid transfer pipe 11.

The water permeability test body C is a plate or block made of soil such as earth and sand in a deep geological formation, soil taken from the vicinity of a geological disposal target, or soil taken from an isolation wall such as concrete constructed during geological disposal. What is processed into a shape is used.

The sample liquid sampling apparatus B according to the present invention comprises a liquid transfer pipe 11, a liquid control means 12, and a liquid branch pipe 1.
3, a nozzle elevating means 14, a liquid supply nozzle 15, a container replacement means 16, a first liquid level detecting means 17, a second liquid level detecting means 18 and the like.

The liquid transfer pipe 11 takes out the permeated liquid obtained by sending the sample liquid from the sample liquid generating means A, for example, the test liquid containing a nuclide such as TRU metal as described above to the column test tank 7. The liquid is transferred to the liquid supply nozzle 15 by flowing down.

The liquid control means 12 is provided in the middle of the liquid transfer pipe 11 to control the supply and stop of the liquid,
Control unit 12a having a timer function, and the control unit 12a
A three-way valve 12b that causes the sample liquid to flow down to the liquid supply nozzle 15 or the liquid branch pipe 13 and a control valve 12c connected in series to the three-way valve 12b are arranged.

As shown in FIG. 2, the nozzle raising / lowering means 14 is provided with a raising / lowering motor 14a attached to a part of the container replacing means 16 and a rack / motor for converting the rotation of the raising / lowering motor 14a into a linear reciprocating motion. A rotation / vertical movement converting mechanism 14b such as a pinion or a ball screw mechanism, and a lifting shaft 14c vertically movable via the rotation / vertical movement converting mechanism 14b.
An elevating bracket 14d arranged on the upper end of the elevating shaft 14c, an elevating guide 14e for guiding the up and down movement of the elevating bracket 14d, and a liquid supply to the tip of the elevating bracket 14d horizontally attached to the elevating bracket 14d. Nozzle 15
And an elevating arm 14f to which the first liquid level detecting means 17 is attached.

As shown in FIGS. 2 to 4, the container replacement means 16 has a support structure 16a on which the nozzle elevating means 14 and the liquid supply nozzle 15 are arranged, and an upper part of the support structure 16a. Table rotation motor 16b
A turning shaft 16c that is driven to rotate by the table turning motor 16b, a turntable 16d that is integrally disposed on the turning shaft 16c and turns horizontally, and a support structure 16a.
Support table 16e arranged at the bottom of the turntable 16
bearing 16f interposed between d and the support 16e
And a hole-shaped insertion guide 16g arranged on the turntable 16d for inserting a plurality of collection containers D in the circumferential direction at intervals of, for example, 60 degrees and setting their positions. ..

In the example of FIG. 2, the first liquid level detecting means 17 is attached to the elevating arm 14f of the nozzle elevating means 14 so that the sample container D is placed at the sample liquid sampling target position W.
Is to detect whether or not the liquid level inside the collection container D has reached the set liquid level, the electric signal is obtained by contact with the sample liquid, and the set liquid level is detected. For example, the signal is transmitted to the liquid control means 12.

As shown in FIG. 1, the second liquid level detecting means 18 is arranged in a part of or in the vicinity of the container changing means 16, and is located at a front stage position in the transfer direction (turning direction) of the sample liquid sampling object position W. When the collection container D is arranged in V,
It is detected whether or not the sample liquid is contained in the collection container D at the preceding position V, an electric signal is obtained by contact with the sample liquid, and the operation of the container replacement means 16 is stopped by the detection signal of the set liquid level. It is a thing.

An embodiment of a method for collecting a sample liquid with such an apparatus will be described with reference to the time chart shown in FIG.

"Preparation state: t ₁₀ " As shown in FIGS. 2 to 4, the operation is started with an empty collection container D inserted in the insertion guide 16g of the container replacement means 16. In this case, the liquid supply nozzle 15 is at the upper standby position, the turntable 16d is stopped, and the second liquid level detection means 18 does not detect the liquid filling of the collection container D at the preceding position V. When the state condition is satisfied, the sampling operation of the sample liquid is started, and the operation of the lifting motor 14a in the nozzle lifting means 14 causes
The liquid supply nozzle 15 and the first liquid level detection means 17 are lowered.

[Detection of Empty State of Collection Container: t ₁₁ ] By inserting the first liquid level detecting means 17 into the collection container D, the collection container D at the sample liquid collection target position W is collected.
Is confirmed to be “empty”, the confirmation signal, in FIG. 5, the lower “ON” signal is output. Based on this signal, the timer function of the control unit 12a in the liquid control means 12 is activated. Further, also with respect to the second collection container D in the state of standing by at the front position V, the second liquid level detection means 18 detects whether or not the sample liquid is contained, and the sample liquid is not contained. in case of,
By the operation of the container replacement means 16 as described below,
The process of transferring the collection container D in the standby position at the front position V to the sample liquid collection target position W is repeated.

[Collection of sample liquid: t ₁₂ ] The three-way valve 12b is switched according to a command from the control unit 12a, and the liquid transfer pipe 11 and the liquid supply nozzle 15 are connected to each other, and the water permeability test sample C in the column test tank 7 is Permeate,
The liquid is supplied from the liquid supply nozzle 15 to the first collection container D. This sample liquid is collected by the first liquid level detecting means 17
Inside the collection container D at the sample liquid collection target position W,
It is carried out until it is confirmed that the sample liquid has been collected up to the desired liquid level.

"Stop of sample liquid sampling: t ₁₃ " The sampling amount of the first sampling container D is confirmed by whether or not the first liquid level detecting means 17 has reached the desired liquid level, and a confirmation signal thereof In FIG. 5, the upper "ON" signal is output. Based on this signal, the control unit 12a in the liquid control means 12 switches the three-way valve 12b, disconnects the connection state between the liquid transfer pipe 11 and the liquid supply nozzle 15, and collects the sample liquid in the first collection container D. Is stopped.

"Lift of liquid supply nozzle: t ₁₄ " The nozzle raising / lowering means 14 is operated by the operation signal of the timer function of the controller 12a, and the liquid supply nozzle 15 and the first
The liquid level detecting means 17 is raised.

The "liquid evacuation of the supply nozzle: t _15" the liquid supply nozzle 15 and the first liquid level detecting means 17 is retracted from the operating range of the container replacement unit 16, the containers interchanging means 16 in the operable state ..

"Replacement of collection container: t ₁₆ " The table rotating motor 1 in the container replacement means 16
By the operation of 6b, the collection container D supported by the turntable 16d via the swivel shaft 16c is swung by 60 degrees. Due to this swiveling movement, the sampling container D waiting at the preceding position V is moved to the sample liquid sampling target position W.
Is transferred to and the position is switched.

"Second sample liquid collection: t ₂₀ ~
t ₂₆ ”Hereinafter, even in the case of collecting the second sample liquid, by repeating the steps of t ₂₀ to t ₂₆ as in the case of the steps of t ₁₀ to t ₁₆ described above, the second sample solution is collected. Collection of the sample liquid into the collection container D is executed.

[Collecting third to fifth sample liquids: t _{26 to} t ₅₆ ] And, collecting third to fourth sample liquids and fifth sample not shown in FIG. Even when collecting the liquid, the sample liquid is collected in the collecting container D by repeating the same steps as the above-mentioned steps from t ₁₀ to t ₁₆ .

[Sixth Sample Liquid Collection: t ₆₀ ] Even during the sixth sample liquid collection work, the operation of the lifting motor 14a in the nozzle lifting means 14 causes
The liquid supply nozzle 15 and the first liquid level detection means 17 are lowered.

[Detection of Empty State of Collection Container: t ₆₁ ] By inserting the first liquid level detecting means 17 into the sixth collection container D, the collection container D at the sample liquid collection target position W is While confirmed to be "empty",
With respect to the first collection container D waiting at the front position V, the second liquid level detection means 18 detects whether or not the sample liquid is contained. These confirmation signals, FIG.
Based on the low-order “ON” signal of the first liquid level sensor and the “ON” signal of the second liquid level detecting means in FIG.
The timer function of a is activated.

[Sampling of sample liquid: t ₆₂ ] In accordance with the item of t ₁₂ , the three-way valve 1 instructed by the controller 12a
2b is switched, and the sample liquid is dropped from the liquid supply nozzle 15 to the sixth collection container D. The collection of these sample liquids is performed until the first liquid level detecting means 17 confirms that the sample liquid has been collected up to the desired liquid level.

"Stop of sample liquid sampling: t ₆₃ " The sampling amount of the sixth sampling container D is confirmed by whether or not the first liquid level detecting means 17 has reached the desired liquid level.
The upper "ON" signal in is output. By this signal, the liquid control means 12 switches the three-way valve 12b, disconnects the connection state between the liquid transfer pipe 11 and the liquid supply nozzle 15, and stops the sampling of the sample liquid by the sixth sampling container D.

"Lift of liquid supply nozzle: t ₆₄ " The nozzle elevating means 14 is operated by the operation signal of the timer function of the control unit 12a, and the liquid supply nozzle 15 and the first
The liquid level detecting means 17 is raised.

"Retraction of Liquid Supply Nozzle and Second Liquid Level Detection Means: t ₆₅ " The liquid supply nozzle 15 and the first liquid level detection means 17 are retracted from the operating range of the container replacement means 16, and the container replacement means 16 is returned to an operable state, and even the second liquid level detection means 18 is retracted to a position where it does not interfere with the container replacement means 16.

"End of sample liquid collecting step: t ₆₆ " In the initial state, that is, the liquid supply nozzle 15 is in the standby position above, the turntable 16d is stopped, and the second liquid level detecting means 18 is retracted. After returning to a state in which the various conditions are satisfied, all steps relating to the collection of the sample liquid are completed.

[0038]

As described above, the sample liquid collecting method and the sample liquid collecting apparatus according to the present invention can collect the sample liquid when the sample liquid supplied by the sample liquid generating means is collected in a plurality of collecting containers. Detection of whether or not the sampling container at the position is empty, control of the injection amount of the sample liquid, switching of the container in which the sample liquid was sampled, and whether or not the sampling container at the position before the transfer contains sample liquid The following effects are obtained. (1) Regardless of the type of sample liquid, it is possible to reliably and efficiently collect samples while switching the sampling container. (2) The adaptability can be made excellent in the case where the sample liquid collection operation takes a long time. (3) It is possible to easily achieve automation of the sample liquid collection work by switching the collection container and accurately controlling the process from the work start to the work end. (4) According to the above, at the time of geological disposal, the migration status of water and radionuclides in the soil near the target site or in the artificially constructed isolation wall structure is tested in a state simulated in the actual disposal environment. This is especially useful in some cases.

[Brief description of drawings]

FIG. 1 is a connection diagram showing an example of a case where a sample liquid collecting apparatus according to the present invention collects a liquid that has passed through a test body composed of soil or a partition wall structure.

FIG. 2 is a front cross-sectional view showing a structural example of container replacement means in FIG.

FIG. 3 is a plan view showing a structural example of container replacement means in FIG.

FIG. 4 is a side view showing a structural example of the container replacement means in FIG. 1 with a part cut away.

5 is a time chart of an example of a sample liquid collecting operation process by the sample liquid collecting device in FIG.

[Explanation of symbols]

 A sample liquid generating means B sample liquid sampling device C water permeation test specimen D sampling container R test liquid 1 test liquid supply system 2 sample liquid tank 3 stirrer 4 metering pump for liquid supply 5 liquid supply pipe 6 condensate pipe 7 column test tank 11 liquid transfer pipe 12 liquid control means 12a control part 12b three-way valve 12c control valve 13 liquid branch pipe 14 nozzle elevating means 14a elevating motor 14b rotation up-down motion converting mechanism 14c elevating shaft 14d elevating bracket 14e elevating guide 14f elevating arm 15 liquid supply Nozzle 16 Container replacement means 16a Support structure 16b Table rotation motor 16c Rotation shaft 16d Turntable 16e Support stand 16f Bearing 16g Insertion guide 17 First liquid level detection means 18 Second liquid level detection means V Previous position W Sample liquid Collection target position

Claims (2)

[Claims] 1. A method for extracting a sample liquid from a sample liquid generating means and sampling the sample liquid while intermittently switching the positions of a plurality of sampling containers, wherein the sampling container at the sample liquid sampling target position is empty. Detecting whether or not,
The step of injecting the sample liquid into an empty sampling container, the step of controlling the injection amount of the sample liquid, the step of transferring the sample liquid sampling container into which the sample liquid has been injected, and the sampling container transferred to the sample liquid sampling target position And a step of detecting whether or not the sample solution is contained in the sample solution. 2. A liquid transfer pipe for taking out the sample liquid from the test liquid generating means, a liquid control means for controlling the supply and stop of the liquid interposed in the middle of the liquid transfer pipe, and a sample connected to the liquid control means. The liquid supply nozzle for injecting the liquid into the collection container, the container replacement means arranged in interlocking state with the liquid control means for intermittently switching the position of the collection container, and the collection container connected to the liquid control means at the sample liquid collection target position First liquid level detection means for detecting whether or not it is empty, and detection as to whether or not a sample liquid is contained in a sampling container which is connected to the liquid control means and container replacement means and is transferred to a sample liquid sampling target position And a second liquid level detecting device for collecting the sample liquid.