JPH01265198A - Fuel replacing system - Google Patents

Abstract

PURPOSE:To enable the parallel execution of a refueling operation and CRD exchange operation and to shorten the period for a periodic inspection by constituting the system in such a manner that taking-out coordinate positions or the coordinate positions of charged fuel in a reactor core can be displayed by a monitor device in a central control room. CONSTITUTION:A fuel gripper 14 descends and the fuel 12 is taken out by a fuel grapple 15 when an operator operates an on-board operation panel 16 at the time of executing the fuel replacement. The fuel grapple 15 forms the signal to announce the taking-out of the fuel when the grapple grabs the fuel. A computer 20 forms the in-pole coordinate signal of the taken-out fuel upon receipt of the fuel taking-out detection signal and transfers the signal to a core monitor device 22 of a central control room 21, to display the position of the taken-out fuel. The operation is carried out similarly even in case of charging the taken-out fuel. Then, the fuel taking-out and charging state at the time of the periodic inspection can be administered in the central control room and, therefore, the parallel execution of the fuel replacing operation and the CRD exchange operation which are the critical stage in a nuclear power plant is enabled.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a refueling system for removing or installing fuel in the core of a nuclear power plant, and particularly relates to a fuel exchange system for removing or installing fuel in the core of a nuclear power plant. The present invention relates to a fuel exchange system suitable for shortening fuel exchange.

[Conventional technology]

Conventionally, refueling work and control rod drive mechanism (CIL
D) replacement work was carried out in series.

However, it is possible to carry out the fuel exchange work and CHD replacement work in parallel if the removed fuel is carefully managed in the central operation room, and the parallel work of the above two works can shorten the periodic inspection period. greatly contributes to

In the conventional refueling system, it was possible to visually confirm the state of fuel removal by looking directly into the reactor core with the refueling machine-L. However, there is no other method to confirm which coordinates within the core the fuel is being removed or loaded, or the state of fuel removal or loading throughout the core.

Hereinafter, two typical conventional fuel exchange systems will be explained with reference to FIGS. 8 and 9. In addition, an example of core management in the central operation room will be introduced with reference to FIG.

FIG. 8 is a schematic diagram of the operation performed by the manual fuel exchange system, and FIG. 9 is a schematic diagram of the operation performed by the remotely automatically operated fuel exchange system.

As shown in Fig. 8, in a manual fuel exchange system, a person sits on the fuel exchange machine (operation console) 1, confirms the position of the fuel tank 12 with binoculars, and performs the fuel exchange operation manually. was done manually. This replacement work required visual confirmation by a person, which was not very effective in terms of work time and safety.

As shown in FIG. 9, in the remote automatic fuel exchange system, a person can enter the fuel exchange 11 (
Operate the control panel) to refuel according to the preset refueling pattern program.

is being acquired.

In this way, in both systems, only the person on board the fuel #1 replacement machine 1 could confirm the loading status of fuel #1 throughout the core.

FIG. 10 is an example of a fuel loading state management method.

In this management method, a miniature reactor core 5 simulating the entire area of the reactor core is installed in the central operation room 4 in advance.Miniature fuel is inserted into the miniature core 5, and it can be removed and installed by humans. is now possible.

When a person operating the fuel changing machine 1 takes out or loads fuel, he or she communicates with the person in the central control room 4 by telephone 6 and communicates the coordinates of the removed or loaded fuel.1. A person in the central operation room 4 can manage the fuel loading state throughout the reactor core by removing or attaching the fuel miniature to the reactor core miniature 5. However, this method requires a great deal of care in management because it is managed only by human contact, and there are problems in that it inevitably takes a long time to confirm.

Japanese Patent Application Laid-open Nos. 172590 and 1986 are examples of systems that do not display moving fuel using a television camera, but the fuel loading state throughout the entire core cannot be managed.

[Problem to be solved by the invention]

As described above, in the conventional refueling system, the fuel removal or loading status of the entire core can only be checked on the refueling machine, and furthermore, it is necessary to rely on human visual inspection, and it can be confirmed instantly. Since it was not possible to record or preserve the information, it was not possible to perform fuel removal or core loading status management. For this reason, it was not possible to carry out fuel replacement work and CHD replacement work in parallel, and it was not possible to shorten the inspection period for regular nuclear power plant inspections.

The purpose of the present invention is to make it possible to carry out fuel replacement work, which is a critical bus process during periodic inspections of nuclear power plants, and C and RD exchange work in parallel, and to shorten the inspection period of periodic inspections. An object of the present invention is to provide a fuel exchange system and a core monitoring device that can be shortened.

[Failure to solve the problem]

To achieve the above object, the present invention provides a fuel exchange system for removing or installing fuel in the core of a nuclear power plant, which indicates the coordinate position of the removed or loaded fuel within the core at the time of removal or loading of fuel t1. A signal generation means for generating coordinate signals, and a coordinate signal from the signal generation means to determine whether the entire reactor core is inflamed or not. -1 display means for displaying the unloading or mounting state.

The refueling machine is moved by human operation and the fuel is refueled. In the manual refueling system for removing or loading the fuel described in (1), the signal generating means generates an operation signal that is input by a human operation and instructs the movement position of the fuel changing machine, and a manual refueling system that performs the removal or loading of fuel. The computer has a computer that inputs a detection signal indicating a rack and generates the coordinate signal.

In a remote automatic fuel exchange system that automatically releases or installs fuel by remote control according to instructions from a predetermined fuel exchange pattern program,
The signal generation means has a computer that inputs a control signal instructing fuel removal or installation of the program and a detection number 18 notifying fuel removal or installation to generate the coordinate signal. There is.

Preferably, the display means depicts a core map simulating the reactor core, and indicates the four fuels and one fuel in each core cell based on the coordinate signals and signals from the control rod position indicating device.
It has a core monitor that visibly displays the installation status of the control rods in the reactor.

In addition, in order to achieve the above object, the present invention provides a core monitor device for a refueling system for removing or installing fuel in the core of a nuclear power plant, in which a core map simulating the core is drawn, and each 4 fuel bodies in the core cell and 1
It is characterized by having a reactor core monitor that identifiably displays the installed state of the control rods in the body, and an operating fuel display monitor that displays at least the core coordinates of the fuel in the ridge.

[Effect]

By installing a display means in the central operation room or remote control room to display the fuel removal or loading status of the entire core area, it is possible to display the fuel removal or loading status of the entire core area in the central operation room or remote control room. It is possible to confirm this and perform core management. Therefore, refueling work and CRD replacement work, which are the "critical bus" steps during periodic inspections of nuclear power plants, can be carried out in parallel.

In the manual fuel exchange system computer, the J1
The calculator converts, for example, an operation signal instructing the moving position of the refueling machine into a coordinate signal by inputting a detection signal informing that the fuel t1 is removed or installed.

In a remotely automatically operated fuel change system, the calculator may, for example, convert a control signal instructing fuel removal or installation in the program to coordinates by inputting a detection signal that notifies fuel removal or installation. Convert to signal.

By displaying the installation status of four fuel bodies and one U control rod in each core cell on the core map of the core monitor, it is possible to closely manage the core management of fuel removal and installation status. And it can be done quickly.

In addition to the core monitor, the core monitoring device is provided with an in-operation fuel display monitor that displays at least the core coordinates of the in-operation fuel, thereby making it possible to more comprehensively manage the reactor core.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment in which the present invention is applied to a manual fuel exchange system.

1 and 2, the refueling system includes a refueling machine 13 that moves over the core 11 in a core boule 10 and removes or loads fuel 12.
includes a fuel grab device 14, a fuel grab pull 15, an on-machine operation panel 16, a traveling truck 17, a traversing truck 18, and a control panel 19.
, calculations 11!20 are provided. The refueling system also has a central operation room 21, in which a core monitor device 22 and a control rod display control panel 23 are installed.
5, and the control rod display control panel 23 is connected to the control rod position indication control device T124.

In this manual fuel exchange system, an operator rides on the fuel 11 exchanger 4 and manually operates the machine operation panel 16 to exchange fuel.

The operator determines the core coordinates (X coordinate,
When a manual operation instruction is given on the onboard operation panel 16 aiming at the Y coordinate, the onboard operation panel 16 generates an operation signal corresponding to the core coordinates, that is, the movement position, and sends the operation signal to the traveling truck 17 and the traversing truck 18. The traveling truck 17 and the traversing truck 18 move to the designated core coordinates by this operation signal9.
The operation signals generated on the machine's second operation panel 16 are also transmitted to the control panel 1.
9 is sent to the computer 20.

Core 11. When the fine adjustment of the movement position at F is completed, the operator lowers the fuel gripping device 14 and the fuel 12 is taken out by the fuel grapple 15. When the fuel grapple 15 grabs the fuel 12, it detects this and generates a detection signal indicating the removal of the fuel.

The fuel removal detection signal is sent to the computer 20 of the control panel 19 via the onboard operation panel 16. When the fuel removal detection signal is input, the computer 20 calculates the X-axis and Y-axis coordinate values indicating the coordinate position of the removed fuel in the reactor core based on the above-mentioned movement position operation signal, Generate X-axis and Y-axis signals, ie, coordinate signals. This seat IIK signal is transferred to the core monitor device 22 in the central control room 21, and the core monitor device 22 receives this transferred signal t! X of the fuel taken out based on the signal
The axis and Yllll signals are displayed on the core monitor 25. At this time, a display is displayed so that the difference between the loaded fuel and the removed fuel can be seen.

Similarly, when loading the removed fuel, the traveling truck 17 and the traversing truck 17 are moved in accordance with the movement position operation signal generated by the operator's instructions, the fuel gripping device 14 is lowered, and the fuel Fuel is loaded by disconnecting the fuel from the grapple 15. fuel grapple 1
5 generates a fuel loading detection signal when the fuel is disconnected, as in the case of fuel removal. The movement position operation signal and the fuel loading detection signal are sent to the computer 20 of the control nA 19.
Sent to, total 3! As in the case of fuel removal, when the detection signal is input, the machine 20 calculates the coordinate position of the loaded fuel based on the operation signal, and sends the coordinate signal to the core monitor device 22.
Transfer to. The core monitor device 22 displays the coordinate signal on the core monitor 25 as a loading state.

When performing core management, control rods (hereinafter referred to as C
The state of insertion and withdrawal of the (referred to as R) is an important factor.

Conventionally, the CR display control I permanently installed in the central operation room 21
J! 23 is designed to display the full insertion and withdrawal status of the control rod by the signal from the CR position indication control device 24, but in this embodiment, the ta number from this CR position indication control device 24 is displayed. It is transferred to the core monitor device 22 and displayed on the core monitor 25. This allows the core monitor 25 to display the fuel removal and loading status as well as the CR full insertion and withdrawal status, creating a system that can manage both at the same time.

In addition, the fuel for the core monitor device 22 and the core monitor 25, C
Details of the R display system will be described later with reference to FIGS. 5 to 7.

3 and 4 show an embodiment in which the present invention is applied to a remotely automatically operated fuel exchange system.
Components that are equivalent to those shown in the figures are labeled with the same numbers.

In the fuel exchange system of this embodiment, the fuel exchange 8
113 is a fuel grab device 14, a fuel grab pull 15, an on-machine operation panel 16, a traveling truck 17, a traversing truck 18, and a control gIl.
It is composed of a panel 19 and has a remote control room 30, and inside the remote control room 30, there is a remote control! 1131, calculator 32,
A common control panel 33 and remote control room monitor 34 are installed. The central control room 21 is the same as in the above embodiment, and the CR position control device 24 is also connected to a remote control room monitor 34.

The remote and automatic fuel exchange system is equipped with a remote control panel 31. The in-change pattern program is preset, and as a general rule, operation n is performed remotely from the remote control room 30!
By operating the splint 1 replacement machine 1131, the splint 1 replacement machine 13 is automatically moved according to the 10-gram pattern of the fuel replacement pattern, and the fuel is replaced. Manual operation by an operator is also possible.

Fuel and C when manually operated on the fuel changer 13
The display system on the R core monitor device is the same as that of the manual refueling system described above. However, the operation signal instructing the movement position of the fuel exchanger 13 inputted by manual operation is transmitted to the common control panel 33 of the remote control room 30.
Removal or loading of fuel via fit n R32
The signal is converted into coordinate signals of the axis and Y axis, and transferred to the core monitor device 22 in the central operation room 21. In this way, remote control room 3
By using the functions of 0, the system can be simplified.

When replacing fuel in the remote control room 30 according to a preset fuel replacement pattern program, the control signal instructing the removal of fuel is automatically sent to the common controller in the remote control room 30 by the program. Control panel 33, fuel replacement 1
The traveling truck 17 and the traversing truck 18 are controlled via the control panel 19 of 13.
and the refueling machine 13 receives the signal X indicated by the control signal.
Automatically move to the axis and Y-axis coordinates.

After this, the fuel gripping device 14 is automatically lowered, and the fuel clapper pull 15 causes the fuel f! i12 is taken out. When the fuel grapple 15 grabs the fuel 12, it detects this and generates a detection signal indicating the removal of the fuel.

The detection signal of fuel removal is sent to the control board 19 and the remote scanning chamber 3.
The computer 32 inputs the detection signal to convert the movement position of the control signal into a coordinate signal, and sends the coordinate signal to the core monitor device 22. The data is transferred and displayed on the core monitor 25.

Conventionally, there was a monitor in the remote control room 30 that displayed the coordinates of the fuel being operated and the coordinates of the fuel to be operated next, and the loading status of fuel and CR in the core was not known. Therefore, a core monitor 34 is also installed in this remote control room 30, and a computer 3
The signal converted in step 2 is transferred not only to the core monitor 25 in the central operation room 21 but also to the core monitor 34 in the remote control room 30, and the signal from the Mana Crt position control device 24 is also transferred to the core monitor 25.311. This system displays the loading status of fuel and CTt. As a result, the central control room 21
Core management between the remote control room 30 and the remote control room 30 is unified.

Next, the display system of the core monitor device 22 will be explained with reference to FIGS. 5 to 7.

The screen of the core monitor device 22 is composed of a core monitor 25 and an operating fuel display monitor 4°, as shown in FIG.

The core monitor 25 has a core map of the plant in question, and as shown in FIG.
body fuel 42A, 42B, 42C142D and one CR
43 is displayed so that the loading status can be distinguished.An example of the 6 distinctions is color identification.In this case, the loading status of fuel and the fully inserted status of CR are displayed in blue to indicate the safe side. The color should be similar, and the fuel removal or c
The pulled out state of LT is colored close to red to indicate the dangerous side.

Further, as shown in FIG. 7, the operating fuel display monitor 4o shows the X-axis of the operating fuel that is about to be taken out or loaded and the fuel that is about to be operated next.

By installing such an operational fuel display monitor 4o, which displays Y fill coordinates, fuel serial number (IDNO), and whether the fuel is being removed or loaded, in the core monitor equipment M22, a more detailed core can be realized. Management can be performed in the central operation room 21.

According to the embodiment described above, fuel removal and loading conditions during fuel replacement during periodic inspection can be carefully and quickly managed in the central control room 21 or the remote control room 30.

Therefore, fuel replacement work and CHD replacement work, which are critical power pass steps during regular inspections of nuclear power plants, can be performed in parallel, and the inspection period can be shortened.

As an example, conventionally, during periodic inspections of 1100 MWe class boiling water nuclear power plants (hereinafter referred to as BWR), CRD
It takes about 10 days to replace the fuel, and about 15 days to replace the fuel.
These tasks are carried out in series, so 2
Each task took about 25 days.

According to this example, since the CRD replacement work can be performed during the refueling work period, the two works can be done in about 15 [1] of the refueling work period, and the criticality pass process of the periodic inspection The effect is that the government will have a short term of power for about 10 days.

〔Effect of the invention〕

According to the present invention, it is possible to significantly improve the reliability of fuel replacement work, which is a critical pass process during periodic inspections, and the fuel replacement work and CRD replacement work can be performed in parallel. It is possible to shorten the inspection jtJI interval in the critical pass process.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a manual fuel exchange system according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the fuel exchange system, and FIG. 3 is a conceptual diagram of a manual fuel exchange system according to an embodiment of the present invention. FIG. 4 is a conceptual diagram of a remotely automatically operated fuel exchange system according to an embodiment, FIG. 4 is a block diagram showing the configuration of the fuel exchange system, and FIG. 5 is a schematic diagram of a core monitoring device.
Figure 6 is an enlarged view of the core monitor of the core monitor device, Figure 7 is an enlarged view of the fuel display monitor during operation of the core monitor, and Figure 8 is a schematic diagram of the conventional manual fuel exchange system. FIG. 9 is a schematic diagram of a conventional remotely automatically operated fuel exchange system, and FIG. 10 is an explanatory diagram showing a conventional fuel loading state management method. Explanation of symbols 11...Core 12...Fuel 13...
Fuel exchange machine 16... Onboard operation panel 19... Control 131 20; 32... Computer 21...
・Central operation room 22... Core monitoring device 25...
・Reactor core monitor 30...Remote control room 31...Remote control panel 33...Common control panel 40...Fuel display monitor during operation Applicant Hitachi, Ltd. Representative Patent Attorney Kasuga So-called No. 1 Figure 2 】・Medium fire (Fig. 4, Fig. 6, Fig. 7)

Claims (1)

[Scope of Claims] (1) In a fuel exchange system for removing or installing fuel in the core of a nuclear power plant, a coordinate signal indicating the coordinate position of the removed or loaded fuel within the core at the time of fuel removal or loading. 1. A refueling system comprising: a signal generating means for generating a signal; and a display means for displaying the state of fuel removal or installation in the entire reactor core based on the coordinate signal from the signal generating means. (2) In the fuel exchange system according to claim 1, wherein the fuel exchange machine is moved by a human operation and the fuel is taken out or installed, the signal generating means is inputted by a human operation to the fuel exchange machine. 1. A fuel exchange system comprising a computer that generates the coordinate signal by inputting an operation signal indicating the movement position of the fuel and a detection signal indicating the removal or installation of fuel. (3) In the fuel exchange system according to claim 1, the fuel exchange system automatically takes out or installs fuel by remote control according to instructions from a program of a predetermined fuel exchange pattern. 1. A fuel exchange system comprising a computer that receives a control signal instructing fuel removal or installation and a detection signal notifying fuel removal or installation to generate the coordinate signal. (4) The display means has a core map simulating the reactor core drawn thereon, and the display means has a core map simulating the reactor core drawn thereon, and the four fuels and one control rod in each core cell are determined based on the coordinate signals and signals from the control rod position indicating device. 2. The refueling system according to claim 1, further comprising a core monitor that visibly displays the installation state. (5) In a core monitor device of a fuel replacement system that removes or installs fuel in the core of a nuclear power plant, a core map that simulates the core is drawn, and the four fuel bodies in each core cell are A reactor core monitoring device comprising: a reactor core monitor that identifiably displays the installation state of one control rod; and an operating fuel display monitor that displays at least core coordinates of operating fuel.