JPS63154994A - Fuel exchanger controller - 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] [Industrial Application Field] The present invention relates to a fuel exchanger for exchanging fuel in a nuclear power plant, and in particular to a fuel exchanger suitable for performing quick fuel exchange control. This invention relates to a changeover control device.

[Conventional technology]

Nuclear power plants normally undergo a planned shutdown once a year to inspect their equipment and replace the fuel. This replacement work has traditionally been automated to avoid accidentally damaging the fuel.

On the other hand, in order to determine which fuel to replace during a power plant shutdown period, a program is installed in the plant computer that inputs information from the in-reactor neutron flux detector during reactor operation and constantly monitors the fuel burnup. !2), and more experienced engineers than before can use this plant computer program's extensive calculation information.

We are formulating an optimal fuel change plan. The refueling plan drawn up by a skilled engineer is provided to the nuclear power plant operators in the form of a procedure manual, and the operators follow the refueling procedure stipulated in the procedure manual to the automated fuel exchange plan. After inputting the input into the fuel exchanger control device and confirming that the input procedure is correct, the fuel is automatically exchanged using the fuel exchanger control device.

[Problem that the invention seeks to solve]

However, in recent years, plans have been made to minimize the 1M shutdown period with the aim of improving the capacity utilization rate of nuclear power plants, and as the number of plants increases, skilled engineers are required to respond quickly. This has placed a heavy burden on engineers.

An object of the present invention is to provide a fuel change machine control device that can easily input the planned operating procedure of a fuel change plan support device so that even non-experts can efficiently formulate a fuel change plan. It is in.

[Means for solving problems]

The above purpose is to provide a data memory device that constantly stores the results of monitoring the fuel level of fuel by a plant computer, and to provide a data memory device that constantly stores the results of monitoring the fuel level of fuel by a plant computer, and to A program that determines refueling planning procedures based on data regarding fuel level;
This is achieved by a refueling plan support device comprising an input device for inputting the refueling procedure determined by the program to the refueling machine control device.

[Operation] The program for creating the refueling procedure automatically sets the necessary planning conditions while referring to the information stored in the data memory device.

In addition, the determined refueling procedure can be validated using information stored in the data memory device, ensuring safe and reliable refueling control without the need for expert assistance. Can be implemented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Numerous in-core neutron detectors 3 are installed in the core 2 of the nuclear reactor 1, and the momentary fuel output during operation is monitored by the neutron detectors 3.
, and the signal is input to the computer 4 of the plant. The plant computer 4 normally has a program that calculates the degree of fuel combustion in the reactor core 2 once an hour based on the current neutron flux signal input, and outputs the result to the recording device 11. and input into the fuel replacement plan support device 5. The fuel exchanger control device 5 stores the degree of fuel combustion during plant operation as fuel management data 6. In the event of a planned shutdown of the plant, the operator can use the input/output terminal device 12 of the fuel replacement planning support bag fi5 to set the necessary conditions for this equipment, thereby starting the fuel replacement procedure creation program of this equipment. 7 is activated, and the fuel to be replaced this time is determined while evaluating the degree of combustion of the fuel stored as fuel management data 6. As a result, the fuel replacement procedure is determined, and the determined procedure is output to the flexible disk device M8.

The flexible disk device 8 is also included in the fuel exchanger control device 9.
The fuel exchange procedure determined by the fuel exchange plan support device (2) is stored in the fuel exchange machine control bag M9 via the flexible disk device 8. As a result, the refueling machine control bag e9 can automatically control the refueling machine 10 and replace the predetermined fuel according to the planned refueling procedure.

Next, the fuel change procedure creation program 7 of the fuel change plan support device will be described in detail with reference to FIG. FIG. 2 shows the processing flow of the fuel replacement procedure creation program. When an operator requests startup of this program from the input/output terminal device 12 of the fuel exchange planning support device 5, this program will retrieve necessary information such as the core state at the end of the cycle, fuel specifications in the previous cycle, etc. from the fuel management data 6. The planning conditions are automatically read out and set in this program (201), and then the number of replacement fuel bodies is set (201).
02), With the set number of bodies as a target value, the fuel to be taken out is determined in order from the fuel with the highest fuel content while referring to the fuel management data 6 (203).The position of the fuel decided to be taken out is Since new fuel is loaded, the combustion characteristic data of the new fuel is input from the input/output device ff12 (new fuel loading position setting). This determines the fuel to be continuously burned in the first cycle and the position to be replaced with new fuel. has been determined (204), and the loading position of all fuels in the next cycle has been determined (205).
, The following flow is a process for checking whether the fuel position determined above is appropriate.

“Fuel history data reorganization processing J (206).

The fuel management data 6 that stores the fuel level of the fuel immediately before the plant is stopped is read out, and the new fuel combustion characteristic data input in the "Setting new fuel loading position" process (204) is used to determine the fuel level at the beginning of the next cycle for all fuels. Organize the core state at

As a result, combustion simulation up to the final stage of the core is performed through core simulation calculations (207
), if the cycle length and core characteristics at the end of the cycle obtained are within the specified values, proceed to the next "reactor shutdown margin calculation".
Proceed to processing (208).

If the result is not valid, the process returns to the ``number of replacement fuel bodies setting'' process or the ``removal fuel selection'' process to recalculate the fuel replacement plan.

"Reactor Shutdown Margin Calculation J (209) process calculates the margin for the reactivity required for shutdown when the reactor is shut down in the fuel combustion stage by fuel simulation from the initial core state to the final stage.

As a result, if the necessary margin is obtained, the fuel position is judged to be appropriate (210). This determines the fuel position and number of fuels to be replaced with new fuel in the next cycle from the fuel position in the previous cycle. is determined, and the result is output to the flexible disk device 8 as a fuel replacement procedure.

〔Effect of the invention〕

According to the present invention, a safe and reliable fuel change procedure can be quickly calculated without the help of an expert based on fuel management data that is constantly monitored and stored by a plant computer, and the fuel change procedure can be quickly calculated without the help of an expert. It can be easily input to the switching machine control device.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG. 2 is a processing flowchart of a fuel change procedure creation program according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Nuclear reactor, 2... Core, 3... Neutron flux detection device, 4... Plant computer, ■... Operation planning support device, 6... Fuel management data, 7... Fuel replacement procedure creation program, 8...Flexible disk device,
9... Fuel exchange machine control device, 10... Fuel exchange machine.

Claims (1)

[Claims] 1. A computer that determines the burn-up degree of fuel from a neutron flux detection device installed in the core of a nuclear power plant, a device that stores the calculation results of the computer, and a device that creates the fuel replacement procedure based on the stored results. A refueling machine control device comprising: a device for outputting the created procedure; and a device for inputting the output procedure.