JPH025437Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a nuclear fuel storage system installed between a transfer cavity and a fuel storage pit, which transports nuclear fuel into a nuclear reactor in a containment vessel, and transports spent nuclear fuel from a nuclear reactor to a fuel storage pit. This relates to a transfer device.

As shown in FIG. 1, the conventional nuclear fuel transfer system is provided with a fuel transfer pipe 6 and a gate valve 7 on a partition wall c between a fuel storage pit a filled with shielding water and a transfer cavity b on the reactor containment vessel side. , on running rails 2, 3, and 4 laid in series within the fuel transfer pit a, the fuel transfer pipe 6, and the transfer cavity b,
A fuel transfer truck 1 having a plurality of wheels 5 and running with a fuel container (not shown) mounted thereon is mounted, and the fuel transfer truck 1 is driven by a drive mechanism (not shown) provided on the side of the fuel storage pit a. It is designed to transfer nuclear fuel underwater by moving it back and forth, and when the transfer is completed or an accident occurs, the fuel storage pit a.
The fuel transfer trolley 1 is housed inside the tank, and the fuel transfer pipe 6 is closed by a gate valve 7 to isolate the transfer cavity b and the fuel storage pit a. The gate valve 7 cannot be closed when the fuel transfer trolley 1 is in the position shown in the figure and cannot be operated due to an electrical system or mechanical failure, or when there is no time for repairs, etc. An emergency truck moving mechanism for moving the fuel transfer truck 1 into the fuel storage pit a is also provided.

In the conventional example of the emergency trolley moving mechanism, as shown in FIGS. 1 and 2A and B, an emergency pull-out wire (cable wire) 8 is run from the working surface side of the fuel storage pit a through a sheave 8a. In addition to being arranged along the rail 2, the tip fitting 10 provided at the tip of the extraction wire 8 can be separated into a mounting fitting 11 provided on the side of the truck frame 12 supported on the floor of the fuel transfer pit 2 via legs. A locking fitting 1a, which is connected to the lower side of the fuel transfer truck 1 and into which the pull-out wire 8 is loosely inserted, is configured to lock onto the tip fitting 10, and a hook 9 provided at the upper end of the pull-out wire 8 is connected to the top fitting 10.
is strongly pulled by a winch crane or the like (not shown), the end fitting 10 is removed from the mounting fitting 11, and the pull-out wire 8 is pulled to move the fuel transfer trolley 1 from the illustrated position into the fuel storage pit a. ing.

However, as shown in FIG. 2, the emergency cart moving mechanism in the conventional nuclear fuel transfer device moves the terminal fitting 10c, which is connected to the fork end 10a of the tip fitting 10 by the pin 10b, to the truck frame 1.
The pin 11a is connected to the mounting bracket 11 fixed on the second side, and the terminal fitting 10c of the tip fitting 10 is strongly pulled through the lead wire 8, and the pin 11a is connected to the mounting fitting 11 fixed on the second side.
Since the pin 11a is separated by shearing, fragments of the sheared pin 11a are scattered and mixed into the drive mechanism of the fuel transfer truck 1, etc., and there is a risk that they will be damaged and malfunction.

The present invention relates to an idea to eliminate the above-mentioned drawbacks of conventional nuclear fuel transfer devices, and involves reciprocating fuel underwater between a transfer cavity and a fuel storage pit through a fuel transfer pipe having a gate valve provided in the bulkhead. A transfer trolley is provided, and a lead-out wire having a tip fitting that is inserted through a locking fitting provided on the fuel transfer cart and is locked to the locking fitting is disposed along a running rail of the fuel transfer cart, In a nuclear fuel transfer device in which a tip fitting is separably connected to a mounting fitting of a truck frame in a fuel storage pit, the fitting is provided with a spring joint mechanism consisting of a spring plate piece that fits and snaps the tip fitting. The feature is that the end fitting of the emergency extraction wire is separably connected to the mounting bracket on the truck frame side by a spring joint mechanism, so that the end fitting of the extraction wire can be disconnected when the connection is separated. The object of the present invention is to provide a nuclear fuel transfer device that does not generate fragments or the like.

The present invention has the above-mentioned configuration, in which the lead-out wire is arranged along the traveling rail of the fuel transfer truck, and the end fitting of the lead-out wire that is latched to the fuel transfer cart is attached to the mounting bracket on the truck frame side. They are separably connected by a spring joint mechanism, so when the pull-out wire is pulled, the end fitting of the pull-out wire is easily separated from the mounting bracket on the truck frame side by the spring joint mechanism, and the tip fitting is connected to the fuel transfer truck. It is possible to lock and move the same truck, and during the separation, cut pieces etc. are not scattered and damage to the drive mechanism etc. does not occur.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 3 and 4, and FIG. 3 is a drawing of a corresponding portion of FIG. A locking metal fitting that locks on the tip metal fitting 0, 8
As shown in Fig. 1, a hook 9 is attached to the upper end, and the sheave 8 is
An emergency pull-out wire (cable wire) 12 is a truck frame arranged along the running rail 2 via a, and a tip fitting 20 on the tip side of the pull-out wire 8 in this embodiment has a fork attached thereto. A terminal fitting 20c connected to a pin 20b is connected to the end 20a, and a fitting head 20d is provided at the tip of the terminal fitting 20c.
A terminal fitting 21b is connected to the fork end of the mounting fitting 21 fixed by welding to the truck frame 12 side by a pin 21a connection, and a terminal fitting 21b is connected to the tip of the terminal fitting 21b on the terminal fitting 20c side. It has a fitting hole 21c into which the fitting head 20d is fitted, and the peripheral surface of the fitting hole 21c is divided into a plurality of spring plate pieces 21d divided into a plurality of pieces by cuts in the axial direction. Cage, tip fitting 20
The fitting head 20d on the side, the plurality of spring plate pieces 21d on the side of the mounting bracket 21, and the fitting hole 21c constitute a spring joint mechanism.

The illustrated embodiment is constructed as described above and includes a fuel transfer cavity b as shown in FIG.
When the fuel transfer cart 1 on the side cannot be moved to the fuel storage pit a side by a normal drive mechanism (not shown), or when it is urgently necessary to move the same, When the pull-out wire 8 is pulled in the same manner as described in FIG. 1, the tip fitting 20
The pins 20b and 21a of the mounting bracket 21 are not sheared, and the spring plate 21d of the terminal fitting 21b on the mounting bracket 21 side is deformed outward by its elasticity, and the fitting head 20d on the end fitting 20 side is In order to come out of the fitting hole 21c, the tip end fitting 20 is separated from the mounting fitting 20 side at the spring joint mechanism portion.

Therefore, the locking fitting 1a on the side of the fuel transfer truck 1 is locked to the tip fitting 20, and the fuel transfer truck 1 can be urgently moved into the fuel storage pit a by the pull-out wire 8, and the partition shown in FIG. By closing the valve 7, it becomes possible to shut off the transfer cavity b and the fuel storage pit a, and it is possible to take measures such as investigating the cause of the accident.

In addition, as described above, the tip fitting 20 and the mounting fitting 2
1 are connected to each other by the above-mentioned spring joint mechanism, and when they are separated, no shearing of the members occurs, so there is no scattering of fragments, etc., and the integrity of the moving mechanism etc. is improved. Further, as described above, the tip fitting 20 and the mounting fitting 21 are not damaged and can be reused as they are, and the reconnection operation can be performed extremely easily.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view showing the entire conventional nuclear fuel transfer device, Figures 2A and B are an enlarged side view and the same plan view of the portion shown in Figure 1, and Figures 3A and B are one implementation of the present invention. FIG. 4 is an enlarged side view and a plan view of a corresponding portion of FIG. 1 showing an example, and FIG. 4 is an enlarged sectional view of the spring joint mechanism in FIG. 3. a: fuel storage pit, b: transfer cavity,
c: bulkhead, 1: fuel transfer trolley, 1a: locking metal fittings,
2, 3, 4: Traveling rail, 8: Extraction wire, 1
2: Truck frame, 20: Tip metal fitting, 21:
Mounting bracket, 20d: Fitting head, 21c: Fitting hole,
21d: Spring plate.

Claims (1)

[Scope of utility model registration request] A fuel transfer truck is provided which reciprocates underwater between the transfer cavity and the fuel storage pit through a fuel transfer pipe having a gate valve provided on the bulkhead, and the fuel transfer truck is inserted through a locking fitting provided on the fuel transfer truck to transfer the fuel. Nuclear fuel is separably coupled to a mounting bracket of a truck frame in a fuel storage pit by disposing a lead-out wire having a tip fitting that is locked to a locking fitting along the running rail of the fuel transfer truck, and using the tip fitting to attach the nuclear fuel wire to a mounting bracket of a truck frame in a fuel storage pit. 1. A nuclear fuel transfer device, characterized in that said mounting fitting is provided with a spring joint mechanism made of a spring plate piece that fits and snaps said tip fitting.