JPS60219592A - Abnormality detector for fuel bucket in nuclear power fuel transfer facility - 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 The present invention relates to a device for detecting an abnormality during the movement of fuel packets in nuclear fuel transfer equipment.
A fuel transfer cell 3 is provided above between the reactor core 1a and the ex-core fuel storage tank 2, and ramps 4.5 are installed from the fuel transfer cell 3 to the core 1a and the ex-core fuel storage tank 2 of the reactor vessel l, respectively. A fuel packet 6 is placed within the inclined path 4°5, and a chain 7 is placed.
The fuel transfer cell 3 is connected to a hoisting device 8 provided in the fuel transfer cell 3, and a movable ramp 9 swinging between the extensions of the ramps 4 and 5 is provided in the fuel transfer cell 3. .゛The spent fuel in the core 1a of the reactor vessel 1 is held by the fuel exchange device 1O and is waiting at the position shown in the figure. On the other hand, the fuel packet 6 is lowered by the hoisting device 8 and slides down the ramp 4 to just below the fuel exchange device @10, and the spent fuel is stored in the fuel bucket 6.

The fuel packet 6 containing the spent fuel is lifted up into the movable slope 9 by the hoisting device 8, and then the movable slope 9 is swung and connected to the slope 5. In this state, the fuel packet 6 is slid down, and the spent fuel is stored in the extra-core fuel storage tank 2.The new fuel stored in the extra-core fuel storage tank 2 is transferred to the fuel exchange device IO and transferred to the multi-fuel packet 6. It is then loaded into the core 1a of the reactor vessel 1 by retracing the same route as above. When the transfer and exchange of old and new fuel is completed in this way, the fuel packet 6 is pulled up into the movable ramp 9, the ramps 4 and 5 are closed with a boat valve (not shown), and the movable ramp 9 is brought into a vertical state. , wait until the next fuel change time comes.

By the way, the above-mentioned nuclear fuel transfer equipment and dividing slope 4.
Because the inside of 5 has a highly radioactive atmosphere and is very narrow, it is not possible to directly monitor the inside. Abnormalities such as friction with the wheels of the fuel packet 60 (friction and sliding between the rail flange and the wheel flange) or poor wheel transfer due to failure of the wheel bearings, etc. This was determined by detecting the torque of the drive shaft.

This fuel packet 6 abnormality determination method is based on the fuel packet 6 abnormality determination method.
Since transmission equipment such as a speed reducer is installed between the engine and the motor, it is difficult to detect slight abnormalities, and it is difficult to detect abnormalities in the fuel packet 6 early or to accurately determine the position of the fuel packet 6. The present invention was made to solve this problem, and it is possible to easily, reliably, and accurately detect even a slight abnormality in a fuel packet moving up and down on a slope, and to accurately determine the position of the fuel packet. The present invention aims to provide an abnormality detection device for fuel packets in nuclear fuel transfer equipment that is capable of detecting abnormalities in fuel packets in nuclear fuel transfer equipment.

Hereinafter, one embodiment of the fuel packet abnormality detection device according to the present invention will be explained with reference to FIG. 2. Reference numeral 3 denotes a fuel transfer cell;
Slopes 4 and 5 are provided from the fuel transfer cell 3 to the core 1a of the reactor vessel 1 and the external fuel storage cypress 2 (see FIG. 1).

Reference numeral 11 denotes a circular guide tube which is the main body of the ramps 4 and 5, and within this guide tube 11 are provided opposing channel-shaped rails 12 on which the fuel packets 6 run on wheels 6a. 13 is a slope cooling equipment installed on the outer periphery of the guide pipe IT;
Reference numeral 14 denotes a bellows whose upper end is supported on the floor side of the fuel transfer cell 3 so as to be able to absorb the thermal expansion of the ramps 4 and 5.

Reference numeral 15 denotes an ultrasonic acoustic detector of the abnormality detection device, which is attached to the outer circumferential surface of the upper end of the slope 4 and guide pipe 50.

A waveguide rod 16 is coupled between the rail 12 and the inner surface of the guide tube 11 to which the ultrasonic acoustic detector 15t is attached. A filter amplifier 17 located away from the slopes 4 and 5 is connected to the ultrasonic acoustic detector 15, and a signal processing device 18 is connected to the filter amplifier 17. According to the fuel packet abnormality detection device of the above embodiment, the fuel packet 6 runs on the rails 12 of the slopes 4 and 5 with the wheels 6a. Waveguide without sound attenuation $16. The sound is detected reliably and accurately by the ultrasonic book detector 15 directly through the guide tube 11, and the sound is sent to the filter amplifier 17 where it is filtered and amplified, and the filtered and amplified acoustic signal is Sent to signal processing device L8,
Here, a comparison calculation is made with the preset acoustic signal of the passing sound of the fuel packet when it is normal. When the level of the acoustic signal sent from the filter amplifier 17 is high or the acoustic waveform is different from normal, An abnormality in the packet 6, that is, friction between the wheel 6a of the fuel packet 6 and the rail 12, or one wheel 6
It is determined that an abnormality such as poor transfer of wheel 6a is occurring due to failure of the bearing part of a, etc., the abnormal number of the determination result is sent to the alarm 19, and the alarm 19 issues an alarm. Also, while the fuel packet 6 enters the ramps 4 and 5 and travels, the sound of the traveling sound is reliably detected and detected by the ultrasonic acoustic detector 15 as described above. , it is possible to accurately determine that the fuel packet is in the 60th position f1 based on the change in the sound level over time in the signal processing device 18. Similarly, by attaching the ultrasonic acoustic detectors 15i at several locations on the outer periphery of the guide tube 11, the position of the fuel bag 6 can be determined more accurately.

In the fuel packet abnormality detection device of this embodiment, the ultrasonic acoustic detector 15 does not penetrate the cover gas boundary, does not interfere with the slope cooling equipment 13, and can be replaced in the event of failure, so maintenance is easy. Excellent in sex.

Next, another embodiment of the fuel packet abnormality detection device according to the present invention will be described with reference to FIG. Since the same reference numerals in the figure as in FIG. 2 indicate the same parts, the explanation thereof will be omitted. In this embodiment, a support 21 having a recess 20 is integrally provided on the outer surface of one side of the rail 12, and an ultrasonic acoustic detector 15 is attached near the inner lower end, and an automatic detachable plug 22 is attached to the opening on the side surface of the upper bent part. The elongated case 23 is inserted into the guide tube 11 along the outer surface of one side of the rail 12 through a through hole 24 provided on the outer side of the upper end of the rail 12, and the lower end of the case 23 is inserted into the recess 20 of the support 21. The cable of the automatic detachable plug 22 and the Ni-filter amplifier 17 is connected to the automatic detachable plug 22.

According to this fuel packet abnormality detection device, the sound of the fuel packet 6 running on the rail 12 is reliably and accurately detected directly from the rail 12 by the ultrasonic sound detector 15, and the sound signal is transmitted to the filter amplifier. The filtered and amplified acoustic signal is sent to processing unit 14, where it is filtered and amplified.
The fuel packet 6 is sent to the fuel packet 8 as in the previous embodiment.
If it is determined whether n1 is normal or abnormal, an abnormality signal is sent to the alarm device 19, and the alarm device 19 issues an alarm. Further, the position of the fuel packet 6 while traveling on the slopes 4 and 5 can be accurately determined by the change in the sound level with the passage of time in the signal processing device 18, as in the case of the previous embodiment.

The fuel packet abnormality detection device of this embodiment is of a cartridge type in which the ultrasonic acoustic detector 15 can be taken in and out of each case 23, and the cable can be connected using the automatic delayering plug 22. Since there is no interference with the boat valve, maintenance is difficult, and ultrasonic acoustic detector 1
5 can escape the thermal expansion of slopes 4 and 5, and furthermore, because of the low temperature, the influence of sodium vapor vapor is small.

As can be seen from the above explanation, the fuel packet abnormality detection device according to the present invention includes an ultrasonic acoustic detector installed in the middle of a slope, a filter amplifier connected to the detector, and a filter amplifier connected to the detector.
A signal processing device is connected to the amplifier, and an alarm is connected to the signal processing device to detect and judge the sound when the fuel packet is running, so it is possible to detect the friction between the wheels of the fuel packet and the slope rail. If an abnormality occurs, such as poor wheel transfer due to wheel bearing failure, the sound level will rise significantly compared to the sound level during normal fuel packet running, and the acoustic waveform will be different from normal, so the fuel packet Abnormalities can be determined simply, reliably, and accurately. Further, there is an effect that the position of a fuel packet traveling on a slope can be determined based on a change in the It4i level that changes over time.

[Brief explanation of the drawing]

Figure 1 is a schematic longitudinal cross-sectional view showing the entire fuel transfer facility, Figure 2
The figure shows an embodiment of the fuel packet abnormality detection device of the present invention, and FIG. 3 shows an embodiment of the fuel packet abnormality detection device. l...Reactor vessel 1a...Reactor core 2...External fuel storage tank 3...Fuel transfer cell 4.5...Slope
6...Fuel packet 6a...Wheel 7...Chain 8...Hoisting device 9...Possible wJ slope lO...
・Fuel exchange device 11... Guide pipe 12... Rail
13...Slope cooling equipment 14...Bellows 15.
...Ultrasonic acoustic detector 16...Waveguide rod 17...
Filter amplifier 18... Signal processing device @ 19...
Alarm device 20... recess 21... support 22...
・Automatic detachable plug 23°・°Case 24...Through hole Applicant: Kawasaki Heavy Industries, Ltd. Applicant: Electric Power Research Institute, Inc., Agent: Patent attorney: Yujibe Taka

Claims (1)

[Claims] An ultrasonic acoustic detector is installed in the middle of the slope of the fuel transfer equipment from the core of the reactor vessel to the fuel transfer cell and from the fuel transfer cell to the extra-core fuel storage tank, and a filter amplifier is connected to the detector. A fuel packet abnormality detection device in a nuclear fuel transfer facility, comprising: a signal processing device connected to the filter amplifier; and a monitor connected to the signal processing device.