JPH07218682A - Fuel distribution confirming device - Google Patents

Abstract

PURPOSE:To exactly and quickly monitor the refueled result in reactor refueling by making a special computer output the core fuel distribution information signal and an under water camera output the image signal of the core fuel distribution. CONSTITUTION:An under water TV camera 1 photographing the upper core surface transmits image signal to am image processing device 3 through a cable 2. The device 3 compares it with the image stored in advance and transmits the image as image signals to a fuel distribution diagnosing device 4 when a change is observed in refueling state such as in the distribution of fuel assemblies in the core. A refueling machine 5 outputs the process of exchange work of fuel assembly as work signal to a special computer 6. The computer 6 transmits the distribution information signal of the fuel assembly moved in the core by the refueling machine 5 from this work signal to a diagnosing device 4. The diagnosing device 4 compares the image signal from the device 3 with the distribution information signal from the computer 6 to judge whether the refueling is properly done and displays the image of the care state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel arrangement confirmation apparatus for monitoring whether or not fuel is being replaced normally during refueling work carried out in a nuclear reactor of a nuclear power plant.

[0002]

2. Description of the Related Art In a nuclear power plant, replacement work of a fuel assembly which is a fuel in a nuclear reactor is carried out in a periodical inspection which is regularly carried out. In this refueling operation, a worker operates a fuel exchanger installed above the submerged reactor in accordance with a predetermined fuel replacement procedure, and a slender fuel is attached to the tip of a long main hoist of the refueling machine. Grab an aggregate and do.

Further, in the refueling work, with respect to a large number of fuel assemblies in a nuclear reactor, the taking out to the outside of the nuclear reactor, the loading from the outside to the nuclear reactor, and the relocation within the nuclear reactor are all performed underwater. The work is carried out while the operator visually confirms that the result is surely carried out for each procedure.

[0004]

The refueling work in a nuclear reactor of a nuclear power plant is all performed in deep water, the number of which is large, and the fuel assembly has an elongated shape and is partitioned by an upper lattice plate. Since the replacement work takes a long time and requires more personnel, the possibility of human error cannot be denied because the work is taken out from the narrow space provided and loaded.

In particular, confirmation of whether the fuel assembly has been taken out from a predetermined position or loaded has required a skilled technique for observing the condition in deep water, which has been a factor of prolonging the working time. .

The object of the present invention is to monitor the upper surface of the reactor core with an underwater television camera during fuel replacement of the reactor,
An object of the present invention is to provide a fuel arrangement confirmation device that accurately and promptly monitors the result of refueling.

[0007]

In order to achieve the above-mentioned object, a fuel arrangement confirmation apparatus according to the invention of claim 1 is a fuel exchanger which is movably installed on the upper part of a nuclear reactor to carry out refueling work. A fuel allocation information signal in the core output by a dedicated computer that receives the work signal output during operation of the fuel exchanger, an underwater television camera that outputs the fuel replacement status in the core as a video signal, and this video signal are input. Image processing device that outputs as an image signal when there is a change, and a fuel that inputs this image signal and the fuel arrangement information signal and compares them to diagnose fuel replacement work by the fuel exchanger. It is characterized by comprising a placement diagnostic device.

According to a second aspect of the fuel arrangement confirmation apparatus of the present invention, an underwater television camera for outputting as a video signal the fuel replacement situation in the core installed in the reactor is arranged on the upper flange of the reactor. And

[0009]

According to the first aspect of the invention, the dedicated computer outputs the fuel arrangement information signal in the core to the fuel arrangement diagnosing device in response to the work signal output when the refueling machine performs the refueling work. Further, the underwater television camera outputs a video signal of the fuel arrangement in the core to the image processing device, and in the image processing device, when the fuel arrangement of the video signal changes as a result of refueling of the fuel exchanger, this image is displayed. The signal is output to the fuel arrangement diagnosis device as a signal.

In the fuel arrangement diagnosis device, the arrangement information signal from the dedicated computer is compared with the image signal from the image processing device to diagnose the result of the fuel replacement work by the fuel exchanger, and this is notified by an image display. To do.

According to a second aspect of the present invention, an underwater television camera for outputting the fuel refueling condition in the core as a video signal is installed on the flange of the reactor underwater, so that the fuel in the core installed in the reactor is fueled. The arrangement can be easily photographed with no blind spots in its field of view.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In the first embodiment, as shown in the block diagram of FIG. 1, a cable 2 for transmitting a video signal is connected to an underwater television camera 1 for taking an image of an upper surface of a core (not shown) underwater. Transmits the video signal to the image processing device 3.

The image processing device 3 performs image processing on the input video signal and compares it with the previously stored video of the core,
When the fuel replacement state in the core, that is, when the arrangement of the fuel assemblies at each coordinate of the core changes, the image at this time is transmitted to the fuel arrangement diagnosis device 4 as an image signal.

On the other hand, a fuel exchanger 5 installed in the upper part of the reactor for handling a fuel assembly which is a fuel in the reactor (not shown).
Outputs to the dedicated computer 6 of the fuel exchanger 5 the work progress of the fuel assembly as a work signal. Dedicated computer 6
Transmits a placement information signal in the core 8 of the fuel assembly 10 moved by the fuel exchanger 5 from this work signal to the fuel placement diagnostic device 4.

The fuel arrangement diagnosing device 4 compares the image signal from the image processing device 3 with the arrangement information signal from the dedicated computer 6 to make a diagnosis as to whether or not the fuel has been replaced correctly. The core state is displayed as an image by the image signal from the image processing device 3.

If the result of the diagnosis is normal, the color of the coordinate portion where the fuel is changed in the displayed image is changed or flicker is given. Also, in the case of an abnormality, the color is changed to a color that distinguishes it from the normal case, or the abnormality is notified at the flicker speed. Further, this abnormality notification may be confirmed by an operator if necessary, or may be changed to a different color as a confirmation or a hold, or may be changed to a flicker speed or deleted.

Next, the operation of the above configuration will be described. As shown in the sectional view of the underwater television camera arrangement in FIG.
A reactor core 8 is installed in the lower part of the open nuclear reactor 7, and a large number of fuel assemblies 10 are loaded between the upper lattice plates 9. Further, one or more underwater television cameras 1 according to the present invention are arranged on the upper surface of the flange of the submerged nuclear reactor 7.

In this underwater television camera 1, a plurality of flanges 7a of the reactor pressure vessel forming the outer shell of the reactor 7 are arranged at appropriate positions so that there is no blind spot in the field of view, so that the space between the upper grid plates 9 is reduced. It is possible to observe a large number of fuel assemblies 10 loaded in the fuel cell 10 and their replacement states by the fuel exchanger 5.

The procedure excerpt of FIG. 3 is an example of excerpt of the fuel refill procedure manual, and the display image of FIG. 4 further shows an image of the state in which the blade guide process by the procedure number 103 in FIG. 3 is completed. The display image diagram of FIG. 5 shows a state in which the fuel transfer by the procedure number 104 in FIG. 3 is completed.

Here, taking the fuel movement of the procedure number 104 in FIG. 3 as an example, the arrangement state of the fuel assembly 10 in the fuel arrangement diagnosing device 4 is the procedure number 103 before the work of the procedure number 104 is completed. Therefore, at this time, FIG. 4 is displayed on the screen of the fuel arrangement diagnosing device 4 by the underwater television camera 1.

In FIG. 4, the core 8 is circled for convenience of explanation.
The fuel assembly Y201 surrounded by 11a, which is the target of the procedure number 104 for the next fuel replacement work, is loaded at the coordinates 31-12. In addition, there is no fuel assembly at the coordinates 41-22 surrounded by the circle 12a of the transfer destination, and it is empty. As a result, at the next procedure number 104, the fuel assembly Y201 at coordinates 31-12 is coordinated.
It can be seen that there is no problem in moving to 41-22.

In the refueling work, the worker does the refueling machine 5
To perform the work of procedure number 104 according to the fuel refill procedure manual. That is, the fuel exchanger 5 is set to the coordinate 31 of the core 8.
At the -12 position, the loaded fuel assembly Y201 is lifted and taken out from the core 8, and the fuel exchanger 5 is moved to the coordinates 41-22 of the core 8 and then the fuel assembly Y201 is lowered to the core 8. To load.

The work information of the refueling machine 5 is transmitted as a work signal to the special-purpose computer 6 and stored therein, and the special-purpose computer 6 tells the fuel arrangement diagnosis device 4 to collect fuel at the coordinates 31-12 of the core 8. Take out the body (Y201) and coordinate 41-22
The arrangement information signal loaded with the fuel assembly (Y201) is output to.

During this time, the image from the underwater television camera 1 is that the refueling machine 5 grabs the fuel assembly Y201 at the coordinates 31-12 of the core 8, takes it out of the core 8 and moves to coordinates 41-22, where it is loaded. An image of the process is taken and transmitted to the image processing device 3 as a video signal.

The image processing apparatus 3 performs image processing on the input video signal and moves the fuel assembly 10 in the core 8, that is, the input video signal and the previously stored core 8
If there is a change in the arrangement of the fuel assembly 10 at each coordinate, the image at this time is transmitted to the fuel arrangement diagnosis device 4 as an image signal.

In the fuel arrangement diagnosis device 4, the image signal from the image processing device 3 is compared with the arrangement information signal of the replacement work from the dedicated computer 6, and the coordinates 31-12 of the core 8 are emptied by the arrangement information signal. And that the fuel assembly was loaded at coordinates 41-22, and the coordinates of the core 8 from the image processing device 3
31-12 becomes empty, and instead, the image signal due to the change that the fuel assembly is loaded at coordinates 41-22 is used to diagnose whether or not the refueling has been correctly performed.

When the fuel replacement according to the procedure number 104 is normally performed, the image displayed on the fuel arrangement diagnostic device 4 is as shown in FIG. 5, and for the sake of convenience, the coordinates 31 surrounded by the circle 11b are shown.
It can be seen that -12 is empty and the fuel assembly (Y201) is loaded at coordinates 41-22, which are also surrounded by the circle 12b.

In this state, the image from the underwater television camera 1 is the state of the core 8 shown in FIG. 4 and FIG.
The image signal of the image shown in FIG. 5 is transmitted from the image processing device 3 to the fuel placement diagnostic device 4 because there is a clear change in the coordinate 31-12 surrounded by the circle and the coordinate 41-22 surrounded by the circle 12b. .

However, at this time, the arrangement information signal from the dedicated computer 6 indicates that the fuel arrangement diagnosing device is the replacement record with the coordinate 31-12 being empty and the fuel assembly being loaded at the coordinate 41-22 as shown in FIG. 4 and no abnormality is found in the comparison diagnosis in the fuel arrangement diagnosis device 4, and therefore,
Nothing is notified to the display image as shown in FIG.

When the diagnosis in the fuel arrangement diagnosing device 4 is normal, the fuel arrangement detected by the image processing device 3 is checked as necessary for the worker to confirm the refueling work performed. The coordinates 31-12 in Fig. 5 which is the change point of
The portion of coordinates 41-22 may be displayed with a color or flicker speed that distinguishes it from the abnormality notification, and this normal notification can be erased by a confirmation operation by an operator.

Further, regardless of the fact that the fuel exchanger 5 was operated according to the fuel exchange procedure manual to perform the fuel exchange,
It is assumed that there is an abnormality such that the fuel assembly 10 having a coordinate different from that in the fuel replacement procedure manual is taken out or the fuel assembly 10 is loaded at a coordinate different from that in the fuel replacement procedure manual.

At this time, the underwater television camera 1 takes an image of the arrangement information signal input from the dedicated computer 6 to the fuel arrangement diagnosis device 4 along with the replacement work of the fuel exchanger 5 in accordance with the fuel replacement procedure manual. The image signal due to the change in the core 8 input through the image processing device 3 does not match in the comparison process performed by the fuel arrangement diagnosis device 4, and therefore an abnormality is diagnosed.

When the abnormality is diagnosed, the corresponding coordinate portion in the image display in the fuel arrangement diagnosing device 4 changes to a color that calls attention, or flicker,
This allows the worker to know at which coordinate position the refueling is abnormal. The abnormality notification is a color change or a flicker speed indicating an abnormality confirmation or a hold state by a confirmation operation by an operator.

As described above, the change in the fuel arrangement in the core 8 in deep water and the refueling work carried out by the refueling machine 5 and the dedicated computer 6 according to the refueling procedure manual are carried out by the refueling device 4 The results of the fuel replacement are accurate and can be confirmed quickly because the results of the replacement work are diagnosed by making a comparison in.

[0035]

As described above, according to the present invention, the state of fuel arrangement in a nuclear reactor can be accurately confirmed, and further, the result of refueling work performed in a nuclear reactor in deep water by a fuel exchanger is immediate and accurate. From being diagnosed by
This has the effect of improving the reliability and work efficiency of refueling work.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an embodiment according to the present invention.

FIG. 2 is a layout cross-sectional view of an underwater television camera according to an embodiment of the present invention.

FIG. 3 is an excerpted diagram of a fuel replacement procedure manual.

FIG. 4 is a screen display diagram of the core in procedure number 103 in one embodiment according to the present invention.

FIG. 5 is a screen display view of the core in the procedure number 104 in one embodiment according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Underwater television camera, 2 ... Cable, 3 ... Image processing device, 4 ... Fuel arrangement diagnostic device, 5 ... Fuel exchanger, 6 ... Dedicated computer, 7 ... Reactor, 8 ... Reactor, 9 ... Upper lattice plate, 10,
Y201 ... Fuel assembly, 11a, 11b, 12a, 12b ... Yen.

Claims (2)

[Claims] 1. A fuel exchanger installed movably above a nuclear reactor of a nuclear power plant for refueling work, and a core output by a dedicated computer to which a work signal output during operation of the fuel exchanger is input. A fuel placement information signal, an underwater television camera that outputs the fuel replacement status in the core as a video signal, an image processing device that outputs this video signal as an image signal when a change occurs, and this image signal And a fuel placement confirmation device for inputting the fuel placement information signal and comparing the signals to diagnose the fuel replacement work by the fuel exchanger. 2. The fuel arrangement confirmation device according to claim 1, wherein an underwater television camera for outputting as a video signal the fuel replacement status in the core installed in the reactor is arranged on the upper flange of the reactor.