JPH0335520B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an underwater solid recovery device that captures and recovers solids settled at the bottom of a nuclear reactor vessel, cavity, spent fuel pit, etc. .

(Prior art) An underwater solid recovery method for recovering solids that have settled to the bottom of a reactor vessel, cavity, spent fuel pit, etc. uses an underwater bench to pinch the solids that have settled to the bottom of the reactor vessel, cavity, spent fuel pit, etc. There are two methods: one is to collect solids, and the other is to use a pump to suction and collect the solids. Each is suitable for recovering solids.

Next, a conventional example of an underwater solid recovery device used in the latter recovery method will be explained with reference to Fig. 1.
is the suction nozzle, 2 is the flexible pipe, 3 is the suction pipe, 4 is the ejector (injection pump), 5 is the submersible pump, 6 is the suction filter, 7 is the high-pressure supply pipe, 8 is the discharge pipe, 9 is solid recovery and drainage Filter, 10 is solid, 11 is support, 12 is connecting pin, 13 is hanging metal fitting, 14
is a crane, 15 is a crane hook, and 16 is an operation wire for the suction nozzle 1, which is suspended from the crane 14 via a metal fitting 13 and a support 11 to support the suction nozzle 1 near the bottom of the pool, while supporting the submersible pump 5 and suction The filter 6 and the solid recovery/drainage filter 9 are connected to the suction nozzle 1, the flexible pipe 2, and the suction pipe 3.
In this state, the submersible pump 5 is driven to suck water near the solid suction systems 1 to 3 from the suction filter 6 to the submersible pump 5 (as indicated by the arrow). (See A) On the other hand, this water is discharged from the submersible pump 5 to the high-pressure supply pipe 7 to the discharge pipe 8, and this high-pressure discharge flow draws the solid 10 that has settled on the bottom of the pool and the water near it to the suction nozzle. 1 → flexible pipe 2 → suction pipe 3 → suction into discharge pipe 8,
The water is sent to the solid recovery/drainage filter 9, where the solids 10 are recovered, while the water that has flowed into the solid recovery/drainage filter 9 is discharged from the solid recovery/drainage filter 9 into the water near the solid suction systems 1 to 3 (see the arrows). B
reference). Further, once the solids 10 are collected, the entire underwater solids collection device is lifted up and the solids 10 are removed from the collection/drainage filter 9.

(Problems to be Solved by the Invention) In the underwater solid recovery device shown in FIG. Since the recovery/drainage filter 9 discharges water in the vicinity of the solid suction systems 1 to 3 in the direction of arrow B, the suction flow A and the discharge flow B create a swirling flow in the vertical direction around the solid suction systems 1 to 3. C is generated, the water near the suction nozzle 1 (water near the bottom of the pit) is stirred, and the suction nozzle 1, which is supported by the flexible tube 2 so that the suction angle can be adjusted, swings and collects solids. 10 collection work becomes unstable. At that time, an underwater camera (not shown) attached to the suction nozzle 1 or the flexible tube 2 is remotely operated to visually observe the recovery work of the solid 10 by the suction nozzle 1, but the suction nozzle 1 swings. This makes visual inspection difficult and makes remote control of the underwater camera cumbersome.

Furthermore, in the underwater solid recovery device shown in FIG. 8,
Since the submersible pump 5 is submerged in water, this part becomes contaminated and there is a problem in that it takes a lot of time for related maintenance, inspection, and restoration.

The present invention is generally proposed to solve the above-mentioned problems, and its purpose is to be able to stably perform solid recovery work, and to enable visual observation of recovery work using an underwater camera and remote control of the underwater camera. Easy to operate. Another object of the present invention is to provide an underwater solid recovery device that allows easy maintenance, inspection, and restoration of the device.

(Means for Solving the Problems) In order to achieve the above object, the underwater solid recovery device of the present invention has a collection case, an ejector, and an inlet with porous holes in the lower end of a rod member inserted into the water from above the water surface. A pipe, a flexible pipe, and a suction nozzle are connected in that order, and the collection case is supported in water far upward from the suction nozzle, and water near the water surface is sucked in and this water is transferred from the ejector to the collection case. An ejector-driven pump that injects an upward jet stream to water is installed on the operating surface above the water surface, a winder is attached to the upper end of the rod member, and an operating wire extending from the winder is attached to the suction nozzle. ing.

(Function) The underwater solid recovery device of the present invention is configured as described above, and water near the water surface is sucked in by an ejector-driven pump, and this sucked water is injected as an upward jet stream from the ejector to the porous recovery case. Then, this jet flow sucks the solids that have settled on the bottom of the pool and the water near them from the suction nozzle → flexible pipe → suction pipe → ejector → the porous collection case, and the solids are collected into the collection case. Meanwhile, the water flowing into the collection case is discharged into the water from the porous collection case, that is, the porous collection case is supported far from the water surface and the bottom of the pool. At that time, rotate the winder attached to the upper end of the rod member to wind up the operating wire, or
Pull it out to adjust the suction angle of the suction nozzle.

(Example) Next, the underwater solid recovery device of the present invention will be described with reference to an example shown in FIGS. 10 is a suction pipe, 105 is an ejector (injection pump), 106 is an ejector drive pump, 107 is a flexible hose, 108 is a supply pipe, 10
9 is collection case (recovery wire mesh = filter), 11
0 is a solid to be recovered, 111 is a rod member, 112 is a winder, 113 is a hanging metal fitting, 114 is a crane hook, 115 is a suction pipe, 116 is an underwater camera, 1
17 is the operating wire, 118 is the structure inside the pit, 1
19 is a high-pressure water plenum chamber, 120 is an injection nozzle, 121 is a connecting fitting, 122 is an ejector discharge pipe, 123 is an ejector diffusion pipe, 124 is a connecting stay, 125 is a recovery filter frame, 126 is a detachment pin, 127 is a Detachment spring, 128 is the fulcrum, 129
is the suction pipe connection fitting, 130 is the connection pin, and the first,
As shown in Figures 5, 6 and 7, the suction nozzle has 10
There are 1, 101', 101'', and 101 types of suction nozzles, and among these suction nozzles, for example, the suction nozzle 101 and the coil spring 10
3, the flexible tube 102, the suction tube 104, the ejector 105, and the recovery case 109.
are connected in that order from bottom to top, and suction nozzle 101 and collection case 109 are far apart in the vertical direction. In addition, the collection case 109 is located at the lower end of the rod member 111 inserted into the water from above the water surface.
is fixed, and the ejector drive pump 106 is installed on the operation floor above the water surface, and the ejector drive pump 106 is connected to the ejector 105 via a flexible hose 107, and the operation wire 11
7 is attached to the protrusion of the suction nozzle 101, a winder 112 is attached to the upper end of the rod member 111, and an operating wire 117 extending from the suction nozzle 101 is wound around the winder 112. The tip end thereof is fixed to the winder 112.

Next, the operation of the underwater solid recovery apparatus shown in FIGS. 1 to 7 will be explained in detail. A porous collection case 109, an ejector 105, and a suction pipe 104 are attached to the lower end of the rod member 111 that is inserted into the water from above the water surface.
, the flexible tube 102 and the suction nozzle 101 are connected in that order, and the suction nozzle 101 is placed in the collection case 109.
An ejector-driven pump 106 is installed on an operation surface above the water surface and supports the pump far away from the water surface and sucks water near the water surface.
is driven to suck water near the water surface from the suction pipe 115 to the ejector drive pump 106. Also, the high pressure water discharged from the ejector drive pump 106 is transferred to the flexible hose 107 → supply pipe 108 → high pressure plenum chamber 119 → injection nozzle 120 - diffusion pipe 123 →
A jet stream is injected into the recovery case frame 125 of the recovery case (recovery wire mesh = filter) 109, and the jet stream sucks up the solid 10 that has settled to the bottom of the pool and the water near it through the suction nozzle 1.
01 → Flexible tube 102 → Suction tube 104 → Diffusion tube 12
3->The solid 10 is sucked into the collection case 109 and collected at the bottom of the collection case frame 125, while the water that has flowed into the collection case 109 is discharged from the collection case (recovery wire mesh = filter) 109 into the water.

At that time, the winder 112 is rotated, and the operating wire 1
Coil spring 10 by winding up or unrolling 17.
3 is wrapped around the flexible tube 102 as a coil spring 1
The suction nozzle 1 is bent against the elastic restoring force of 03.
Change the direction of 01 and collect solids such as corners. Further, an underwater camera 116 is attached to the suction pipe 101 or the flexible pipe 102, and when the direction of the suction nozzle 101 is changed as described above, the underwater camera 116 also changes direction together with the suction nozzle 101, and the solid 10 is Monitor recovery work from the operation floor. In addition, the collection case frame 125 and the collection case (recovery wire mesh = filter) 109 are divided into two, and the collected solids are transferred to the collection case 10.
9, the detachment pin 126 is pulled out from the operation floor via a rope (not shown). At this time, due to the elastic force of the leaf spring 127, the collection case 109 and the collection case frame 125 can be split into two parts.
and open around the fulcrum 128, and these separate from the diffusion tube 123 portion of the ejector 105. When this state is reached, operate the rope from the operation floor to pull up the collection case 109 and the collection case frame 125 above the operation floor, and take out the solid 10 collected at the bottom of the collection case frame 125. .

(Effects of the Invention) As described above, the underwater solid recovery device of the present invention sucks water near the water surface using the ejector-driven pump, and injects the sucked water as an upward jet flow from the ejector to the porous recovery case. The jet flow sucks the solids that have settled on the bottom of the pool and the water near them from the suction nozzle → flexible pipe → suction pipe → ejector → the porous collection case, and collects the solids into the collection case while collecting the solids. Since the water that has flowed into the case is discharged into the water from the porous collection case, which is located far away from the water surface and the bottom of the pool, the solid suction system is not required as in the conventional underwater solid collection equipment. There are no suction and discharge flows on both sides of the pool, and there is no vertical swirling flow near the bottom of the pool, making it possible to perform solid collection operations stably. And the underwater camera can be easily controlled remotely.

Furthermore, since the ejector drive pump and the winder are disposed above the water surface, there is no contamination of those parts, and the underwater solid recovery apparatus can be easily maintained, inspected, and restored.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the underwater solids recovery device according to the present invention, Fig. 2 is an enlarged vertical cross-sectional side view of the ejector portion, Fig. 3 is a cross-sectional plan view thereof, and Fig. 4 is a coiled spring wrapped around the ejector. side view of the flexible tube section,
5, 6, and 7 are longitudinal sectional side views showing each embodiment of the suction nozzle, and FIG. 8 is a side view showing a conventional underwater solid recovery device. 101... Suction nozzle, 102... Flexible tube, 103
... Coil spring, 104 ... Suction pipe, 105 ... Ejector, 106 ... Ejector drive pump, 107 ... Flexible hose, 109 ... Collection case (recovery wire mesh = filter), 110 ... Solid to be collected, 111 ... Rod member,
112...Discharge pipe of ejector, 123...Diffusion pipe of ejector, 125...Recovery filter frame of recovery case 109.

Claims (1)

[Claims] 1 Connect a porous collection case, an ejector, a suction pipe, a flexible pipe, and a suction nozzle in that order to the lower end of a rod member that is inserted into the water from above the water surface, and move the collection case far away from the suction nozzle. An ejector-driven pump is installed on the operating surface above the water surface, and is installed on the operating surface above the water surface, and is installed on the operation surface above the water surface, and the ejector-driven pump sucks in water near the water surface and injects this water from the ejector to the recovery case as an upward jet stream. An underwater solid recovery device characterized in that a winder is attached to the winder, and an operating wire extending from the winder is attached to the suction nozzle.