JP4469302B2 - Foreign matter suction collection device - Google Patents

Description

  The present invention relates to a foreign matter suction and recovery device, and more particularly, to a foreign matter suction and recovery device for collecting foreign matter at a portion where a person cannot enter, such as an upper portion of a fuel rod container of a nuclear power plant.

  If a foreign object is found in the upper part of the fuel rod container of a nuclear power plant, in order to recover it, conventionally, the submersible pump, strainer and suction part are connected with a hose, submerged in the fuel pool, and the suction part is operated using an operation pole. It was collected near the top of the fuel rod container.

  However, the water depth to the upper part of the fuel rod container is about 8 m, and it is difficult to bring the suction part closer to the upper part of the fuel rod container using the operation pole from the fuel exchange platform, and the fuel is not damaged. It was required to be done carefully and required skill. Furthermore, it is necessary to pull up and store the submersible pump, strainer, suction part and hose after such a recovery operation, but this operation is also complicated and requires a lot of labor.

  As described above, the conventional foreign matter collecting work is a work that requires skill, and a large amount of labor is required for the preparation work, the collecting work, and the tidying up, so a foreign matter suction and collection device that is simpler and easier to handle is required. ing.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an apparatus for easily recovering foreign matters present in the upper portion of the fuel rod container in a short period without damaging the fuel rod in the nuclear reactor. It is to be.

  As a result of intensive investigations to solve the above-mentioned problems, the present invention integrates a container incorporating a submersible pump, a strainer and a suction part, and further uses a handle of the fuel rod container as a guide, It has been found that if a device attached to the upper part is used, the suction part can be securely and easily attached to the upper part of the fuel rod container, and foreign substances present on the upper part of the fuel rod container can be easily recovered. It was.

  In addition, it has been found that if a device having a built-in stirring nozzle is used as the suction unit in the above apparatus, the accumulated foreign matter is suspended by the stirring flow, and the foreign matter can be efficiently collected in a short time.

  Furthermore, in the above device, the suction part has a trapezoidal cross section with the bottom open, so that the suction part can be brought close to the upper part of the fuel rod container and sucked with a strong suction force. It was found that large foreign matter can be recovered.

  Furthermore, in the foreign material recovery apparatus having a stirring nozzle, a suction part having a polygonal structure is formed, and a suction hole is provided at a corner of an axis of the opposing surface, thereby strengthening the swirl flow inside the suction part by suction water. It has been found that the foreign matter suction rate can be improved.

  Accordingly, in the present invention, a suspendable container having a suction submersible pump housed therein, a suction part and a recovery strainer are integrally formed, and a guide for storing a fuel rod container handle is provided in the suction part. This is a foreign matter suction and recovery device.

  Moreover, this invention is the said foreign material suction collection apparatus with which the said suction part is a shape which covers a fuel rod container upper part, and the watering nozzle is provided in the inside of the said suction part.

  Further, in the present invention, the suction part has a polygonal shape covering the upper part of the fuel rod container, and the foreign matter is provided with a suction hole at each corner part which is an axis object of the opposing surface of the polygonal side surface. A suction recovery device.

  Furthermore, the present invention is the above foreign matter suction and recovery device, wherein the suction portion is provided in the vicinity of the upper side surface of the fuel rod container and has an open shape with a trapezoidal cross section.

  The foreign matter suction / collection device of the present invention recovers foreign matter after attaching a fuel rod container handle portion provided in the suction portion to the fuel rod container handle portion. The suction part can be installed and can be easily handled on the fuel exchange platform without requiring high skill.

  Further, if a suction nozzle with a built-in stirring nozzle is used, the stir flow can be caused to float the accumulated foreign matter, and the foreign matter in the entire upper portion of the fuel rod container can be efficiently recovered.

  Furthermore, when the suction part is an open trapezoidal shape provided near the upper side surface of the fuel rod container, it is possible to obtain a stronger suction force and efficiently remove foreign substances with heavy specific gravity or large foreign substances. It can be sucked and collected well.

  The invention will now be described in conjunction with the drawings illustrating some preferred embodiments of the invention.

  FIG. 1 is a drawing showing a suction recovery apparatus in which the shape of the suction part covers the upper part of the fuel rod container and a watering nozzle is provided inside the suction part. In the figure, 1 is a foreign matter suction and recovery device, 2 is a container, 3 is a hanging part, 4 is a submersible pump, 5 is a recovery strainer, 6 is a suction part, 7 is a fuel rod container handle part storage guide, 8 is a stirring nozzle, Reference numeral 9 denotes a watering pipe, and 10 denotes a power cord.

  A foreign matter suction / collection apparatus 1 shown in FIG. 1 has a handle 3 for suspending, and a container 2 in which a submersible pump 4 is housed is integrally coupled to a collection strainer 5 and a suction unit 6. The suction part 6 of this device is of a shape (cover type) that covers the upper part 20 of the fuel rod container, in which a fuel rod container handle part insertion guide 7 for storing the fuel rod handle part 21 is provided. Yes.

  Thus, since the fuel rod handle portion 21 can be stored in the fuel rod container handle portion insertion guide 7 inside the suction portion 6, when the foreign matter suction and recovery device 1 is used, the device is removed from the fuel exchange platform. The suction rod 6 is suspended from the fuel rod container upper portion 20 by an auxiliary hoist (not shown) permanently installed on the fuel exchange platform, and the fuel rod container handle portion insertion guide 7 is fitted to the fuel rod handle portion 21. It can be securely attached to the upper part 20 of the fuel rod container.

  That is, FIG. 2 shows the fuel rod container upper part 20 in a partially cutaway state, but the fuel rod container upper part 20 has a fuel rod container handle portion 21 for taking it in and out. By providing the fuel rod container handle portion insertion guide 7 having a shape, the suction portion 6 can be mounted without rattling or moving.

  When the submersible pump 4 is started after the suction unit 6 is mounted on the fuel rod container upper portion 20, suction is started from the suction unit 6, and the foreign matter is collected by the collection strainer 6 during the suction. At the same time, as shown in FIG. 1, if a stirring nozzle 8 is provided and a part of the water sucked by the submersible pump is discharged from the sprinkling pipe 9, a stirring flow is generated in the space inside the suction part 6. And the recovery efficiency is increased.

  The suction unit 6 described above has no bottom surface and has a cubic shape including four side surfaces and an upper surface. However, the shape is not limited to such a form. Alternatively, it may be a polygonal column shape formed by the side surface and the upper surface. Further, if the suction part 6 is removable from the recovery strainer 5, the universal foreign matter suction and recovery apparatus 1 can be obtained by using the suction part 6 that matches the size and shape of the fuel rod container. .

  Furthermore, if the collection strainer 5 for collecting foreign substances is made of a transparent material, for example, a transparent resin such as acrylic, the degree of collection of foreign substances can be confirmed with, for example, an underwater camera.

  The foreign matter collected as described above can be easily taken out from the collection strainer 5 by lifting the suction collection device 1 and then taking out the submersible pump 4 from the container 2.

FIG. 3 is a polygonal shape, and suction holes 12 for sucking liquid from the outside are provided at the corners of the opposing surfaces, and the form of the suction part 6 of the type covering the upper part of the fuel rod container is shown as the flow of liquid. When is a drawing showing both. In the figure, 12 is a suction hole, A is a swirling flow, B is a stirring flow, C is a suction flow, and the other numbers are the same as in FIG.

  The suction part 6 of the aspect shown in FIG. 3 is provided with a stirring nozzle 8 therein. A swirling flow A is generated inside the suction unit 6 due to the liquid flow from the stirring nozzle 8 and the suction force of the submersible pump 6. When the swirl flow A is generated in this way, the suction flow C is generated from the suction hole 12 in a form of being drawn into the swirl flow A. Since the suction hole 12 is provided at a corner portion that serves as an axis reference for the opposing surfaces of the polygon, this suction flow C also works together with the swirl flow A to further strengthen it. The foreign matter wound up by the stirring flow B generated by the stirring nozzle 8 is strongly sucked up by the swirling flow A, and is efficiently captured by the recovery strainer 5 and sucked and collected.

  The suction holes 12 provided in the cover-type suction part 6 do not have to be provided on all of the side surfaces of the polygon, but at least the suction holes 12 are provided on a plurality of opposing surfaces to improve the effect of sucking and collecting foreign matter. . Moreover, the position of the suction hole 12 needs to deviate from the center of the polygonal side surface. In addition, a polygon here means a quadrangle (quadrangle prism), a hexagon (hexagonal prism), an octagon (octagonal prism), etc.

  FIG. 4 is a drawing showing another preferred form of the suction recovery apparatus 1. In the figure, reference numeral 11 denotes an underwater camera, and other numerals mean the same as in FIG.

In this embodiment, the suction part 6 is provided in the vicinity of the side surface of the fuel rod container upper part 20 and has an open cross-section with a trapezoidal shape. In this manner, suction force is generated only in the trapezoidal suction portion 6, since the relatively strong suction force, the foreign matter present in the fuel rod container top 20, even those that specific gravity, also Even a certain size is sucked from the suction unit 6 and collected by the collection strainer 5.

  The foreign matter suction / collection operation in the foreign matter suction / recovery device 1 is substantially the same as that described above. That is, the foreign matter suction and recovery device 1 is suspended from the fuel exchange platform to the position of the upper portion 20 of the fuel rod container by an auxiliary hoist (not shown) permanently installed on the fuel exchange platform, and the fuel rod handle insertion guide 7 The portion 22 can be reliably attached to the fuel rod container upper portion 20 as a guide. In addition, when the submersible pump 4 is activated, foreign matter is collected from the trapezoidal suction section 6, and the suction collection device 1 is lifted and then separated from the submersible pump 4 so that the foreign matter can be easily taken out. Further, if the collection strainer 5 is made of a transparent resin and the inside is observed with the underwater camera 11, the degree of collection of foreign matters can be confirmed during the collection operation.

  The foreign matter recovery apparatus of the present invention is designed to fit the fuel rod container handle portion 22 of the fuel rod container upper portion 20 and the fuel rod container handle portion insertion guide 7 and fix the suction portion 6, and therefore requires high skill. In this way, the foreign matter on the upper part of the reactor fuel rod can be recovered.

  Therefore, it can be advantageously used in the safe maintenance and management of the nuclear reactor.

It is drawing which shows the one aspect | mode of this invention foreign material suction collection apparatus. It is a partially cutaway view showing the shape of the upper part of the fuel rod container. It is drawing which showed this invention foreign material suction collection apparatus of the aspect with which the suction part was polygonal and the suction hole was provided in the side surface with the flow of the liquid. It is drawing which shows another aspect of this invention foreign material suction collection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ...... Foreign matter suction collection apparatus A ...... Swirling flow 2 ...... Container B ...... Stirring flow 3 ...... Hanging part C ...... Suction flow 4 ...... Submersible pump 5 ...... Collection strainer 6 ...... Suction part 7 ...... Fuel rod container handle storage guide 8…… Stirring nozzle 9…… Sprinkling tube 10…… Power cord 11…… Underwater camera 12…… Suction hole 20…… Fuel rod container upper portion 21…… Fuel rod handle portion 22…… Fuel rod

Claims (3)

A foreign matter suction and recovery device mounted on the upper part of a fuel rod container in a nuclear power plant, having a guide for fitting with the handle of the fuel rod container inside, and a suction hole for sucking water from the fuel pool on the side surface A polygonal suction portion whose bottom surface is opened so as to cover the upper portion of the fuel rod container; a recovery strainer connected to the upper portion of the suction portion for recovering foreign matter from water from the suction portion; and the strainer The suction unit is connected to a suspendable container, which is connected to an upper portion of the suction unit and includes a submersible pump for sucking water from the strainer, and the swirl flow is generated inside the suction unit. The foreign matter suction and recovery device, wherein the holes are respectively provided in corner portions which are axial objects of the opposing surfaces of the polygonal side surfaces . 2. The foreign matter suction according to claim 1, wherein a sprinkling pipe and a stirring nozzle are provided inside the suction portion to float accumulated foreign matter by discharging water from the submersible pump. Recovery device. A foreign matter suction and recovery device attached to the upper part of a fuel rod container in a nuclear power plant, provided in the vicinity of the upper side surface of the fuel rod container, and having a horizontal section with a trapezoidal shape and a bottom surface opened to suck water in the fuel pool ; And a recovery strainer connected to the upper part of the suction part for separating foreign matter from the water from the suction part, and a submersible pump connected to the upper part of the strainer for sucking water from the strainer. A foreign matter suction and recovery device, wherein a container that can be suspended is combined as a unit.

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