JPH0443840Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a solid matter recovery device for recovering solid matter that has settled in water, for example, at the bottom of a nuclear reactor vessel.

(Prior Art) A conventional solids recovery device will be explained with reference to FIG. 8. 1 in FIG. 8 is a solids recovery filter;
2 is a suction nozzle, 3 is a surveillance camera integrally attached to the suction nozzle 2 via a fixing fitting 4, 5 is a flexible tube that supports the suction nozzle 2 in a downwardly depressable manner, 6 is a rope take-up reel, A rope of the take-up reel 6 extends to the fixing metal fitting 4, and by rotating the take-up reel 6 to let out and take up the rope, the suction nozzle 2 and the surveillance camera 3 are held down. It's getting old. Further, 8 is an ejector provided in the conduit between the flexible tube 5 and the solids recovery filter 1;
Reference numeral 9 indicates an ejector drive pump (high pressure generation); 10 indicates a water tank; 11 indicates a high pressure hose extending from the ejector drive pump 9 to the ejector 8; The water is sucked into the ejector 9, sent from the ejector drive pump 9 to the ejector 8 via the high pressure hose 11, and injected from the porous nozzle in the ejector 8. Water is sucked in from the suction nozzle 2 and sinks into the water tank 10. A water flow is generated in the ejector 8 at a flow rate sufficient to suck the solid matter 14. Also, this ejector 8 transfers the sucked water and solid matter 14 to the solid matter recovery filter 1.
The water is discharged into the water through the collection filter net (about 50 mesh mesh) 12 of the solid matter collection filter 1, while the solid matter 14 is captured by the collection filter net 12. In addition, the recovery filter net 12 of the solid matter recovery filter 1 is the eighth
When the rope 13 shown in the figure is pulled, it moves 2 times in the direction of the arrow.
It is split into two pieces, detached from the support 15, and pulled upward, and the solid matter 14 inside is recovered.
The upper end of the support column 15 is fixed to a traverser 16 and can be moved in the X, Y, and Z directions by manual operation, so that the solid object 14 sinking to the bottom of the water tank 10 can be easily approached. It's summery.

(Problems to be solved by the invention) In the solid matter recovery device shown in FIG. 8,
The following problem occurred. That is, during regular inspections, the porous lower core plate (17 in Figure 7) installed inside the reactor vessel
If solid matter has settled to the inner bottom of the reactor vessel below (see), the surveillance camera 3 is integrally attached to the suction nozzle 2. It is impossible to lower it below the plate. Therefore, the lower core structure (see 18 in Figure 7) was removed from the reactor vessel, and the solid matter recovery device shown in Figure 8 was used to remove the solids that had settled to the bottom of the reactor vessel. 14 were recovered. However, it is not preferable to remove the lower core structure from inside the reactor vessel because it requires a lot of effort and also poses a risk of exposure to radiation.

(Means for Solving the Problems) The present invention addresses the above-mentioned problems, and includes a suction nozzle swingably provided at the lower end of the introduction pipe, and a water suction ejector provided in the middle of the introduction pipe. and a solid matter recovery filter provided at the upper part of the introduction pipe, and in which the introduction pipe is suspended and supported in water, a lighting lamp and a surveillance camera are supported on the member on the side of the introduction pipe. The solid matter recovery device is characterized by having an arm that can be moved horizontally, and its purpose is to remove the reactor vessel from the inside of the reactor vessel without removing the lower core structure from inside the reactor vessel. An object of the present invention is to provide an improved solids recovery device capable of recovering solids that have settled to the bottom.

(Function) The solid matter recovery device of the present invention is constructed as described above, in which the suction nozzle, the illumination light, and the surveillance camera are separated, and the member on the introduction pipe side is provided so as to be able to be displaced in the horizontal direction. The illumination light and surveillance camera are supported by the arm, and the suction nozzle, illumination light, and surveillance camera are lowered below the porous lower core plate. Therefore, solid matter that has settled at the bottom of the reactor vessel can be recovered without removing the lower core structure from inside the reactor vessel.

(Example) Next, the solid matter recovery device of the present invention is shown in Figures 1 to 7.
To explain with one embodiment shown in the figure, 1 is a solid matter recovery filter, 2 is a suction nozzle, 3 is a surveillance camera, 6 is a take-up reel for suppressing suction nozzle depression, 7 is a turning handle, 8 is an ejector, and 9 is an ejector. Drive (high pressure generation) pump, 10 is a water tank, 11 is a high pressure hose, 12 is a collection filter net, 14 is a solid material,
15 is a column, 16 is a traverser, 17 is a porous lower core plate, 18 is a lower core structure, 19 is an introduction pipe, 20 is an upper arm, 21 is a lower arm, 22
is the outer cylinder, 23 is the illumination light, 24 is the rotation prevention pin, 2
5 is a sliding groove, 26 is an arm extension mechanism, 27 is a balance weight, the lower arm 21 is slidably inserted into the outer cylinder 22, and the pin 24 provided on the lower arm 21 is provided on the outer cylinder 22. It is slidably inserted into the sliding groove 25. Also, the upper arm 20 is connected to the outer cylinder 2.
The cord of the surveillance camera 3 and the cord of the illumination light 23 pass through the upper arm 20 and the lower arm 21, and the balance weight 2 is fixed to the upper end of the balance weight 2.
7 is attached to the end of each arm 20, 21. In addition, the above-mentioned surveillance camera 3 and the above-mentioned lighting lamp 23
Each of the arms 20 and 21 is provided with a telescopic mechanism 26 for matching the holes in the lower core plate 17. Note that the sliding groove 25 is formed in each arm 2.
0 and 21 (surveillance camera 3 and illumination light 23), two positions are provided on the outer circumferential surface of the outer cylinder 2 so that the two positions in the horizontal direction can be selected, that is, the 45° position and the 90° position (Fig. reference).

Next, the operation of the solid matter recovery apparatus shown in FIGS. 1 to 7 will be explained in detail. When the outer cylinder 22 and the introduction pipe 19 are lowered and the suction nozzle 2 is inserted into the hole (small diameter hole) of the lower core plate 17, a surveillance camera 3 and an illumination light 23 are placed directly above each hole adjacent to the hole.
The arms 20 and 21 are positioned so that the outer tube 22 and the introduction tube 19 are further lowered. At this time, the lower arm 21 comes into contact with the lower core plate 17, and then the outer cylinder 22 slides against the lower arm 21, and the outer cylinder 22, upper arm 20, and introduction pipe 19 descend, and the suction Nozzle 2
A surveillance camera 3 and an illumination light 23 are located near the solid matter that has sunk to the bottom of the reactor vessel. When this state is reached, the ejector drive pump 9 is driven and the water in the water tank 10 is pumped to the ejector drive pump 9.
The ejector drive pump 9 sends it to the ejector 8 via the high pressure hose 11, and injects it from the porous nozzle in the ejector 8. Water is sucked in from the suction nozzle 2, and the solids that have settled in the water tank 10 are Aspirate the object 14. In addition, the ejector 8 guides the sucked water and solid matter 14 to the solid matter collection filter 1, and releases the water from the collection filter net (about 50 mesh mesh) 12 of the solid matter collection filter 1 into the water. The solid matter 14 is captured by the collection filter net 12. At this time, solid matter 14
The recovery status of the equipment is monitored using a surveillance camera 3 and a lighting lamp 23.

(Effects of the invention) The solid matter recovery device of the invention separates the suction nozzle from the illumination light and surveillance camera as described above, and also uses an arm provided on the member on the inlet pipe side so as to be able to move in the horizontal direction. It supports the illumination light and the surveillance camera, and allows the suction nozzle, illumination light, and surveillance camera to be lowered below the porous lower core plate, allowing the lower core structure to be removed from the reactor vessel. Even without this, it is effective in recovering solid matter that has settled to the bottom of the reactor vessel.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the solid matter recovery device according to the present invention, FIGS. 2 and 3 are perspective views showing the inserted state, FIG. Figure 4 is an enlarged side view of the suction nozzle part, Figure 4 is an enlarged front view of the same suction nozzle part, Figure 5 is a plan view of the balance weight, and Figure 6 is the expansion and contraction of the arm part. Fig. 6 is a plan view showing the rotation prevention pin of the arm and the sliding groove of the outer cylinder, Fig. 7 is an explanatory diagram of the operation of the solid material recovery device, and Fig. 8 is a conventional solid material recovery device. FIG. 8 is a side view showing the recovery device, and FIG. 8 is a perspective view showing a solids recovery filter of the same solids recovery device. 1...Solid collection filter, 2...Suction nozzle, 3...Surveillance camera, 8...Water absorption ejector, 19...Introduction pipe, 20, 21...Arm, 2
2... Introductory pipe side member, 23... Lighting light.

Claims (1)

[Scope of utility model registration request] The introduction pipe has a suction nozzle swingably provided at the lower end of the introduction pipe, a water absorption ejector provided in the middle of the introduction pipe, and a solids collection filter provided at the upper part of the introduction pipe. 1. A solid matter recovery device suspended and supported in water, characterized in that an arm for supporting an illumination light and a surveillance camera is provided on a member on the introduction pipe side so as to be movable in a horizontal direction.