JPS6143680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radioactive solid waste suspension device for suspending radioactive solid waste from a crane.

In general, radioactive solid waste includes spent nuclear fuel casks (hereinafter simply referred to as "casks") and the like.

As shown in FIG. 1, a cask 1 of this type is suspended from a rope pulley 3 of a crane by means of a radioactive solid waste suspension device 2, and is raised and lowered by the crane as required.

However, in the conventional radioactive solid waste hanging device 2 shown in FIG. Since the two shackles 7, 7 are simply hung on a hanging hook 9 provided below a crosshead 8 fixed to a rope pulley 3, the following disadvantages arise.

That is, cask 1 is loaded with spent nuclear fuel,
It is then cleaned, decontaminated, and lifted and hung several times before being finally transported. Each time this cask 1 is lifted or hung, the shackle 7, 7
A repeated load was applied to the cask 1, and an impact load was applied to the shackle 7 due to a collision during transportation, causing the shackle 7, 7 to break and the cask 1 to fall and be damaged.

Therefore, conventionally, in order to prevent damage even if the cask 1 were to fall, a shock absorber was installed on the floor of the fuel pool or the floor of the hatch for carrying in and out equipment to the reactor building. The cask 1 was formed so as to reduce the impact load applied to each of the floor sections and to protect the cask 1 itself. However, this shock absorber has disadvantages in that it requires a large device and complicates the structure of the nuclear reactor equipment.

The present invention has been made in view of these circumstances, and the hanging metal fittings and the crosshead are further connected separately from the shackle by a side arm, so that even if the shackle breaks, the hanging metal fittings can be connected to the crosshead and the cask can be continued. An object of the present invention is to provide a radioactive solid waste suspension device that can prevent radioactive solid waste from falling.

Hereinafter, the present invention will be described with reference to embodiments shown in FIGS. 2 to 5.

The same parts as the conventional one are given the same reference numerals.

The crosshead 8 is fixed to shaft plates 10, 10 which are rotatably attached to the rope two-beam pin (not shown) of the rope pulley 3.
Side arms 11, 11 are detachably and rotatably attached to both ends thereof with nuts 12, respectively. The side arms 11, 11 have holes 13, 13 drilled in their lower ends, respectively, and a horizontal shaft 15 extending between support protrusions 14, 14, respectively, protruding from both ends of the upper surface of the hanging metal fitting 6. It is connected to the hanging fitting by penetrating it. Then, as shown in FIG. 4, the support protrusion 14
The hole 16 through which the horizontal shaft 15 passes is formed to have an inner diameter b larger than the diameter a of the horizontal shaft 15, so that when the U-shaped shackle 7, 7 is hooked on the hanging hook 9, the side Arm 11 and hanging bracket 6
The side arms 11 are connected with each other with a degree of freedom so that they can move up and down relative to each other, and are formed so that the load of the cask 1 does not act on the side arms 11. Furthermore, each side arm 11 is formed to have sufficient strength to withstand even if the shackle 7 breaks and the load of the cask 1 acts on the impact. Horizontal axis 1 above
5 is prevented from coming off by nuts 17, 17 attached to both ends. Further, each side plate 5 is rotatably connected to the hanging fitting 6 with a shaft 18, and is further prevented from coming off from the trunnion 4 even while the cask 1 is being moved. Furthermore, this hanging fitting 6 is attached to the cask 1 when it is attached to and detached from the trunnion 4.
are formed in a shape that does not interfere with the cask cooling fins in either the vertical or horizontal positions. Further, as shown in FIG. 5, the crosshead 8 usually has side arms 11 removed and collars 19, 19 attached thereto.

Next, the operation of the present invention will be explained.

To attach the side plates 5, 5 to the trunnion 4 and the hanging bracket 6 fixed to the cask 1 to the crane, first remove the collars 19, 19 from the crosshead 8, and then remove the side arms 11, 1.
1 is temporarily attached with the shafts 7, 7 raised to a position that does not prevent them from being raised. Next, each shackle 7, 7 is raised and hooked onto the hanging hook 9, and then the side arms 11, 11 are attached to the hole 1.
3 is lowered to a position where it matches the hole 16 of the support projection 14, and then the horizontal shaft 15 is passed through each hole 16, 14 and the nut 17 is tightened.

As a result, the hanging fitting 6 is suspended from the hanging hook 9 by the shackle 7, 7, and is connected to the crosshead 8 by the side arm 11, the horizontal shaft 15, and the support protrusion 14.
Therefore, even if the shackle 7 should break, the hanging fitting 6 will be supported by the crosshead 8 via the side arm 11 and will be prevented from falling.

Incidentally, the hanging fitting 6 and the crosshead 8 are separated by the reverse procedure of the above-mentioned assembly.

In this way, the radioactive solid waste suspension device of the present invention has a double suspension system in which the cask is suspended from the crane by the shackle and the side arm, so even if the shackle breaks due to some kind of load action, The cask can be supported by the side arm, the cask can be reliably prevented from falling, the safety is extremely high, and the structure of the device is simple.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional radioactive solid waste hanging device, FIGS. 2 to 5 show an embodiment of the radioactive solid waste hanging device of the present invention, and FIG. 2 is a front view,
FIG. 3 is a right side view of FIG. 2, FIG. 4 is an enlarged view of the circular part in FIG. 2, and FIG. 5 is a front view of the crosshead section before hanging the hanging fittings. 1... Spent nuclear fuel cask (radioactive solid waste), 2... Radioactive solid waste hanging device, 5...
Side plate, 6... Hanging bracket, 7... Shackle, 8... Cross head, 9... Hanging hook, 11... Side arm.

Claims (1)

[Claims] 1. A crosshead having a hanging hook and supported so as to be movable up and down by a crane, a shackle that is connected to and detached from the hanging hook, and a side plate that is detachably formed on the radioactive solid waste. It has a hanging metal fitting, and a side arm that has enough strength to support the radioactive solid waste alone and connects the crosshead and the hanging metal fitting, and the side arm has a hanging metal fitting attached to a hanging hook via a shackle. A radioactive solid waste hanging device characterized in that when the solid waste is suspended, the device is connected to the hanging metal fittings so as to have a degree of freedom in the vertical direction.