JPS6275388A - Fixer for fuel exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a refueling machine fixing device for fixing a refueling machine running on a travel rail fixedly installed on a refueling floor in the event of an earthquake.

[Technical background of the invention and its problems]

Generally, a fuel exchanger in a boiling water type atomic coupler is constructed as shown in FIGS. 4 and 5.

That is, the fuel exchange floor 1 accommodates a cover (not shown) for the reactor pressure vessel 2 and an upper mirror (not shown) for the reactor containment vessel 3, and has a circular opening into which water is injected during fuel exchange. Section 4 has been established.

Further, a spent fuel pool 7 and a storage boule 8 are opened in this opening 4 via communicating passages 5 and 6 that can be opened and closed. A storage rack 10 for storing fuel assemblies 9 is provided in one of the spent fuel boules 7 . Inside the other storage boule 8, a steam separator 11, a steam dried product 12, etc. are housed. Running rails 13.13 are fixed in parallel on the fuel exchange floor 1 on both sides of the spent fuel boule 7, the opening 4 and the storage boule 8. The exchange 1114 is mounted movably on wheels 17.17. This fuel exchanger 14 runs on a running rail 13.13, grasps the fuel assembly 9 with a fuel gripper 15, inserts the fuel assembly 9 into the reactor core 16 in the reactor pressure vessel 2,
It is pulled out or stored in the storage rack 10.

The fuel exchange machine 14 in a boiling water nuclear coupler plant is operated not only during annual fuel exchange, but also during reactor operation to transfer the fuel assemblies 9 in the spent fuel boule 7 to the reprocessing plant. This is done when relocating or moving the fuel exchanger 14 for various reasons, and the frequency of annual operation of the fuel exchanger 14 is high.

If an earthquake occurs during a fuel exchange operation using the fuel exchanger 14, the fuel exchanger 14 tends to slide under the earthquake load in the traveling direction and in a direction perpendicular thereto with respect to the traveling rail 13.13.

In one perpendicular direction, a guide (not shown) fixed to the main body of the fuel exchanger 15114 contacts the running rail 13.13, which is buried in concrete and fixed, from both sides and is subjected to earthquake load. Fuel exchange machine 14 to support
does not slide.

However, in the running direction, since the fuel exchanger 14 is simply mounted on the running rails 13.13 with wheels 17.17, if an earthquake load greater than the maximum static friction force is applied, the fuel The exchange 14 is connected to the traveling rail 13.
I ended up sliding on 13. As a result, the fuel gripper 15
There was also a risk that the fuel assembly 9 would collide with a concrete body or other similar object and be damaged.

[Purpose of the invention]

The present invention has been made in view of these points, and it is possible to securely fix the refueling machine to the running rail during an earthquake, prevent damage to fuel assemblies, etc., and improve the safety of nuclear couplants. It is an object of the present invention to provide a fuel exchanger fixing device that can improve the fuel exchanger fixing device.

[Summary of the invention]

The fuel exchanger fixing device of the present invention is provided on a fuel exchanger running on a fixed traveling rail so as to be able to move toward and away from the traveling rail, and 1) the fuel exchange chamber described in 1j is attached to the traveling rail. The present invention is characterized by being formed by a fixed holding mechanism for fixedly holding the fuel exchanger Im, and a drive mechanism that drives the fixed holding Im to fix the fuel exchanger to the traveling rail in the event of an earthquake.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

Fuel exchanger 1 equipped with the fuel exchanger fixing device of this embodiment
4 is formed in the same manner as the conventional one.

That is, the fuel exchanger 14 includes a bridge 18 placed on the running rail 13.13 and running in the running direction thereof, and a trolley running rail 19 provided on the upper surface of the bridge 18 in a direction perpendicular to the running rail 13.13. .19 and is formed by a trolley 20 with wheels 21.21 which runs perpendicular to the running direction of the bridge 18.

A fuel gripper 15 is attached to this trolley 20. At the lower end of the bridge 18, a number of guides 22.22 (see FIG. 2) are installed on the running rails 13.13 to prevent the bridge 18 from sliding in a direction perpendicular to the running direction during an earthquake. 13. It is fixed with a slight clearance from both outer surfaces of 13. Similarly, a number of guides 23, 23 are fixed to the lower end of the trolley 20 to prevent the trolley 20 from sliding in a direction perpendicular to the running direction of the trolley running rails 19, 19 in the event of an earthquake. (See Figure 3).

In this embodiment, in order to prevent the bridge 18 and the trolley 20 from sliding in the running direction of each running rail 13 and one trolley running rail during an earthquake, an appropriate number of bridge fixing devices 24 are installed at the lower end of each body. And a trolley fixing device 25 is attached. These bridge fixing devices 24 and trolley fixing devices 25 are formed in exactly the same way, and one bridge fixing device 24 will be explained with reference to FIG. Support bracket 2
7, and a bridge fixing lug 28, which is a fixing ridge structure for fixing the bridge 18 to the running rail 13, is attached in each support fitting 27 so as to be vertically movable by a thin lidder 29, which is a drive mechanism. To explain further,
The bridge fixing lug 28 is connected to the lower end beam 26 and the support fitting 27.
The upper end thereof is fixed to the plunger 30 of the thin lidder 29, and the lower end thereof is provided with a contact member that contacts and separates from the lower surface of the traveling rail 13 to hold it fixed. The portion 28a is formed by bending. Compressed air as a driving medium is supplied and discharged from an actuator 31 placed on the bridge 18 to each cylinder 29 via a gas pipe 33 having a solenoid valve 32 in the middle. This solenoid valve 32 is controlled to open and close by an open/close signal sent through a control cable 35 from a control panel 34 provided on the reactor building side.

Also, this control! 834 receives an earthquake detection signal from the seismometer 36 provided on the reactor building side through the control cable 37, and issues an open signal to open the solenoid valve 32 once.

Next, the operation of this embodiment will be explained.

When an earthquake occurs, the seismometer 36 senses it and sends an earthquake detection signal to the control panel 34 through the control cable 37. As a result, the control panel 34 issues an open signal to the solenoid valve 32 through the control cable 35.

Upon receiving this, the solenoid valve 32 is opened, and the actuator 3
The compressed air stored in the trolley fixing device 24 is fed through the gas pipe 33 to the thin lid 29 of the full bridge fixing device 24 and the trolley fixing device 25. Then, the plunger 30 of the thin lidder 29 projects upward to raise the bridge fixing lug 28, and strongly presses the contact portion 28a of the bridge fixing lug 28 against the lower surface of the running rail 13 and the trolley running rail 19. The pressing force of the plunger 30 in this case is such that the frictional force in the traveling direction between the contact portion 28a and the traveling rail 13 and the trolley traveling rail 19 becomes larger than the earthquake load. As a result, the bridge 18 and trolley 20 of the fuel exchanger 14 are connected to the traveling rail 1, respectively.
3 and the trolley running rail 19 are reliably prevented from sliding in the running direction during an earthquake. Further, sliding of the running rail 13 and the trolley running rail 19 in a direction perpendicular to the running direction is prevented by guides 22 and 23, as in the prior art.

In this way, the fuel exchanger 14 is kept stationary and stopped during an earthquake, so the fuel catcher 15 and the fuel assembly 9 suspended thereon move and collide with the concrete frame or other equipment. It is reliably prevented from causing damage or breakage, and safety is also improved.

After the earthquake ends, the compressed air supplied to each cylinder 29 is discharged by opening the release valve (not shown) of the actuator 31, and the bridge fixing lug 28 is lowered together with the plunger 30 to make contact. The portion 28a is separated from the lower surfaces of the running rail 13 and the trolley running rail 19 to release the fixed state, thereby allowing the main body of the fuel exchanger 14 to operate thereafter.

In this embodiment, the seismometer 36 senses an earthquake, and based on this sensing, the bridge fixing bag M24
Since it is formed to operate the bridge fixing lug 28 of the trolley fixing device 25, it does not interfere with the normal fuel exchange work of the fuel exchanger 14, and can be easily applied to the existing fuel exchanger 14. .

Note that a hydraulic device or a mechanical drive mechanism may be used to drive the bridge fixing lug 28 as necessary.

〔Effect of the invention〕

In this way, the fuel exchanger fixing device of the present invention can reliably fix the fuel exchanger to the traveling rail during an earthquake,
It is possible to reliably prevent damage to fuel assemblies, etc., and the safety of the atomic couplant can be improved.

[Brief explanation of drawings]

1 to 3 show an embodiment of the fuel exchanger fixing device of the present invention, FIG. 1 is a front view, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is a An enlarged sectional view taken along the line -■, FIGS. 4 and 5 are a plan view and a sectional view showing the installed state of the refueling machine in the atomic couplant. 13... Traveling rail, 14... Fuel exchange machine, 18.
...Bridge, 19...Trolley running rail, 20...
・Trolley, 24...Bridge fixing device, 25...Trolley fixing device, 28...Bridge fixing lug, 28a・
...Contact part, 29...Thin lidar, 32...Solenoid valve,
36...Seismograph. Applicant's agent Mr. Sato Figure 1 Figure 2 Figure 3 Figure 5

Claims (1)

[Scope of Claims] 1. A fixed holder for fixing and holding the fuel exchange machine on the running rail, which is provided on the fuel exchange machine running on the running rail in a fixed state so as to be able to move toward and away from the running rail. A fuel exchanger fixing device comprising: a mechanism; and a drive mechanism that drives the fixing and holding mechanism to fix the fuel exchanger to the traveling rail during an earthquake. 2. The fixing and holding mechanism is formed by a bridge fixing lug that has a contact part that comes into contact with and separates from the lower surface of the running rail to fix the fuel exchanger, and the drive mechanism is formed by a thin lid that drives the bridge fixing lug toward and away from the running rail. A fuel exchanger fixing device according to claim 1, characterized in that: 3. The fuel exchanger fixing device according to claim 2, wherein the supply and discharge of the driving medium to the cylinder is controlled by a solenoid valve that is opened and closed depending on whether or not an earthquake is detected by a seismometer. .