JP3514879B2 - Resin suction tool for removing waste resin - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste resin from a storage tank for storing spent waste resin generated in a nuclear facility, for example, a primary cooling system ion exchange tower. The present invention relates to a resin suction tool for taking out waste resin for transferring the waste resin to another storage tank. 2. Description of the Related Art A stirrer and a transfer pump are immersed in water in a large storage tank storing waste resin, and the waste resin deposited below the surface of the water is soaked in water and agitated. Japanese Patent Application Laid-Open No. 61-161499 discloses that a pump is sucked by a pump and transferred to a waste container outside the tank. Japanese Utility Model Application Laid-Open No. 64-44498 discloses that a double pipe is inserted into a waste resin layer deposited in a waste resin storage tank, the inner pipe is communicated with a waste pipe by a transfer pipe, and the outer pipe is connected to the waste pipe. A pump is connected in the middle of the water return pipe that communicates with the inside, and the pump is operated to return the water in the waste container to the storage tank by the return pipe, thereby removing the waste resin in the storage tank by the negative pressure generated in the waste container. Disclosed is suctioning into a waste container together with cooling water. [0003] The former prior art method of immersing a stirring and transfer pump in the water of a storage tank is very heavy because the weight of the pump is several hundred kilograms, and various types of pumps in the storage tank are very heavy. A heavy-duty traveling crane must be installed in the tank to move it to the place, and the pump must be suspended from now on. Therefore, in order to implement it in the existing storage tank, the storage tank must be largely remodeled. Further, it is difficult to adjust the mixing ratio of the waste resin to be transferred and the cooling water, and if the concentration of the waste resin is high, the transfer pipe is clogged, and if it is clogged, it is difficult to clean and eliminate the clogging. . Also, the latter of the prior art with a double tube cannot adjust the mixing ratio of the waste resin and water to be transferred. Further, the storage tank of waste resin that can be implemented is limited to a small-diameter storage tank. [0004] The resin suction device of the present invention has been developed to solve the above-mentioned problems of the conventional apparatus, and has an inverted funnel shape, which is connected to a transfer pump at the top. A main body having a transfer port, and a plurality of stirring nozzles provided radially at equal intervals along the lower surface of the main body and jetting stirring water from a lower end portion curved inward toward a lower center portion of the main body, It is characterized by having a plurality of legs projecting downward at equal intervals from the periphery of the main body, and an annular plate having lower ends of the plurality of legs fixed to the upper surface. [0005] In the embodiment shown in the drawings, a suction tool 1 for waste resin
Numeral 0 denotes an inverted funnel, which is provided with a main body 11 having a transfer port 13 at the top of a small diameter and connected to a transfer pump, and is provided radially at regular intervals along the inclined lower surface 12 of the main body. A plurality of, for example, three agitating nozzles 14 for ejecting agitating water from a lower end 15 curved inwardly, and a plurality of legs 16 projecting downward at equal intervals from around the large-diameter lower end of the main body. And an annular plate 17 concentric with the main body and having lower ends of a plurality of legs fixed to the upper surface. Body 11,
The leg 16 and the annular plate 17 are made of an iron plate, and the stirring nozzle 14 is made of a steel tube.
The height from the annular plate 17 to the upper end of the connection port 13 is about 500 mm, and the weight of the suction tool is about 10 kg. An annular header 18 having a stirring water supply port is provided at the upper part of the inclined lower surface of the main body, and the upper ends of the three stirring nozzles 14 are connected to the annular header 18.
In addition, a net 19 is stretched over the inclined lower surface of the main body in order to prevent foreign substances from being sucked. Therefore, as shown in FIG.
The hose 20 from the suction port 1 is connected to the transfer port 13, the discharge port of the pump P1 is connected to the waste tank by a transfer pipe, and the water in the waste resin storage tank is supplied to the water supply port 18 'of the annular header 18. Hose 2 from the discharge port of feed water pump P2
1, the suction tool 10 is lowered onto the waste resin deposition layer 22 in the water in the waste resin storage tank, and the respective pumps P1 and P2 are operated. The suction tool 10 rides on the waste resin deposition layer 22 with the annular plate 17, and since this annular plate serves as a snow-sink, the suction tool 10 is not buried in the waste resin deposition layer, and the upper surface of the waste resin deposition layer, A predetermined distance L is maintained between the transfer port 13 and the lower end. This interval L is preferably about 5 to 10 cm. By the operation of the water supply pump P2, water spouts from the lower ends of, for example, the three stirring nozzles 14 onto the upper surface of the waste resin deposition layer located at the lower center of the main body, so that the resin rises in the water. By the operation of the transfer pump P1, the transfer port 13 sucks the soared resin together with water, and the mixture of resin and water is transferred to the waste tank via the hose 20 and the transfer pump P1. The ratio of water to resin can be maintained at an appropriate ratio by adjusting the amount of agitated water ejected from the agitating nozzle 14 according to the transfer flow rate of the mixture of resin and water. When the clogging of the hose 20 and the piping from the transfer port 13 to the waste container and the resin is clogged, the operation of the water supply pump is stopped. As a result, the transfer port does not suck the resin but only the water, so that the resin can be diluted and washed with the water to eliminate the blockage. FIG. 3 is an explanatory view showing that the waste resin in the water in the huge waste resin storage tank 23 is being transferred to the waste tank 24. Storage tank 23
A small boat 25 with a screw floats on the water surface W of the ship, and the suction device 10 is attached to the lower end of a winch rope 26 loaded on the ship.
The suction tool 10 can be lowered to the upper surface of the waste resin deposition layer 22 by the operation of a winch, or the suction tool can be lifted when the boat is moved, and lowered to another place. The transfer pump P1 and the water supply pump P2 are installed on the water surface W in the storage tank, and are connected to the transfer port 13 of the suction tool and the annular header 18 of the stirring nozzle by hoses 20 and 21. The suction port of the water supply pump P2 is connected to the suction port 27 that floats on the water surface and the hose 2
Connection is made at 8, and the supernatant water in the storage tank is used as the stirring water, and the supernatant water in the waste tank 24 is returned to the storage tank 23 by the return pump P3, so that no makeup water is required. The suction port of this return pump is also connected to a suction port 30 floating above the water surface of the waste tank by a hose 29. In the storage tank 23, an ultrasonic water level gauge 31 for measuring the water level in the tank, a monitoring camera 32 for monitoring the inside of the tank,
A tracking camera 33 for the small boat 25 is provided. The tracking camera 33 always tracks the lamp 34 attached to the front and rear of the small boat,
The image processing device 35 analyzes the image of the tracking camera, and detects the position of the small boat. 36 is a remote control unit of a small boat,
The movement, stop and movement speed of the small boat can be set freely, and the height of waste resin accumulation at the place where the small boat is stopped is calculated and displayed from the amount of lifting and lowering of the suction tool 10. In this way, all operations and monitoring for transferring the waste resin in the waste resin storage tank 23 to the waste tank 24 can be performed remotely. In addition, since each device is portable, if one set is prepared, it can be transferred to waste resin in a plurality of waste resin storage tanks and waste containers. The storage tank for used waste resin in a nuclear facility is a high-dose area, and it is necessary to carry out and install equipment for transferring waste resin quickly to minimize exposure. ,
In this regard, since the suction device of the present invention is small and lightweight, it can be carried in from the entrance door of an existing storage tank and easily inserted through a manhole. Since the mixing ratio of the water and the waste resin to be transferred can be freely adjusted, stable transfer can be performed. or,
Even if the transfer pipe is clogged with waste resin, only the water can be immediately transferred and washed to eliminate the blockage. In addition, equipment can be easily installed and transferred to a storage tank having no means for transferring waste resin without modifying the existing tank.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a suction tool of the present invention. FIG. 2 is a plan view showing a state where the suction tool of FIG. 1 is turned upside down. FIG. 3 is an explanatory diagram of a state in which waste resin is being transferred by a suction tool. DESCRIPTION OF SYMBOLS 10 Suction tool 11 Suction tool main body 12 Lower surface of main body 13 Transfer port 14 Stirring nozzle 16 Leg 17 Ring plate 18 Ring header 19 Net

Continuing on the front page (72) Inventor Shinji Itakura 22 Fukushima Daiichi Nuclear Power Station, Fukushima Daiichi Nuclear Power Plant, Tokyo Electric Power Co., Inc. Fukushima Daiichi Nuclear Power Plant, 22 Fukushima Daiichi, Okuma-machi, Futaba-gun Fukushima Prefecture (72) Inventor Takashi Iwai 4-9 Nihonbashi Kodenmacho, Chuo-ku, Tokyo No. Kurita Engineering Co., Ltd. Tokyo Branch (56) References JP-A-61-204029 (JP, A) JP-A-4-1188082 (JP, A) JP-A-53-8498 (JP, U) US Patent 4037290 ( (US, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G21F 9/22 G21F 9/04 G21F 9/28 511 G21F 9/28 522

Claims (1)

(57) [Claims 1] An inverted funnel-shaped main body having a transfer port connected to a transfer pump at the top, and radially provided at equal intervals along the lower surface of the main body. A plurality of agitating nozzles that spout agitating water from a lower end curved inward toward the lower center, a plurality of legs protruding downward at equal intervals from the periphery of the main body, and a lower end of the plurality of legs A resin suction tool for removing waste resin, comprising: an annular plate fixed to an upper surface.