JPH05323087A - Control rod driving time measuring device - Google Patents

Abstract

PURPOSE:To simultaneously measure each control rod driving time even in the case of duplication of selected control rod insertion period and all control rod insertion period and ensure safety evaluation by providing separately a control rod driving time calculator and its memory for each of periods. CONSTITUTION:When an input output device 5 receives the selected control rod insertion signal 200 from a reactor protection system panel 2, a selected control rod driving time calculator 12 measures the driving time based on the control rod position detection signal 400 of a control rod position detection sensor 4 and stores the result in a selected control rod driving time data memory 13. The calculator 12 also diagnoses whether the selected control rods are normally driven by a selected control rod selection signal 500 from a reactor protection system panel 3. If all control rod insertion signal 100 is received during measuring the selected control rod driving time, all control rod driving time calculator 14 measures the driving time based on the sensor 4 signal with keeping the measurement of the selected control rod driving time and stores the all control rod driving time data in a memory 15. These measurement value can be indicated with a keyboard 11 on a CRT 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control rod drive time measuring device for measuring the drive time of a control rod for starting, stopping and adjusting the output of a nuclear reactor of a nuclear power plant.

[0002]

2. Description of the Related Art In a nuclear power plant, a control rod is inserted into a reactor to start / stop the reactor and adjust the reactor power. The control rod drive time measuring device measures the time during which the control rod is driven.

By the way, the control rod drive time is the total control rod insertion drive time of the time for inserting all control rods in the case of an emergency stop to the reactor, and the control selected when controlling the reactor output. Selection of time to insert rod There is control rod insertion time.

A control rod drive time measuring device in a nuclear power plant can automatically measure all control rod insertion drive times at the time of this emergency reactor shutdown and selective control rod insertion time measurement when the reactor outlet is restricted. It has a function. FIG. 2 shows a block diagram of a conventional control rod drive time measuring device. Less than,
A description will be given with reference to the drawings.

In FIG. 2, a control rod drive time measuring device 1
Is an input / output device 5 for inputting signals from the reactor protection system board 2, the reactor protection system test board 3 and the control rod position detection sensor 4, and the control rod drive time is calculated from the signals from the input / output device 5. It is composed of a computing unit 6, a storage device 7 for storing the computation result, a CRT 9 and a printer 10 for outputting the computation result via an interface 8, and a keyboard 11 for giving an instruction for this output.

In such a structure, the control rod drive time is measured by controlling all control rod insertion signals 100 or selected control rod insertion signals 200 transmitted from the reactor protection system board 2 due to the abnormality of the reactor. When input to the input / output unit 5 of the rod drive time measuring device 1, the arithmetic unit 6 continuously outputs the control rod position signal 400 from the position detection sensor 4 provided for each of the plurality of control rods (for example, 185 rods). The time is measured and the data is stored in the storage device 7. The stored data is transmitted to the CRT 9 or the printer 10 through the interface 8 by the operation of the keyboard 11 by the operator. Further, when the single control rod insertion signal 300 is transmitted from the reactor protection test panel 3, the drive time of one corresponding control rod is automatically measured in the same manner as above.

[0007]

In recent years, with the adoption of new fuels, nuclear power plants have adopted a selective control rod insertion function in all plants in order to maintain the stability of the reactor during low power operation. ..

The selective control rod insertion function is performed by automatically inserting several to several tens of arbitrarily selected control rods out of all 185 control rods during a transient change such as a reactor recirculation pump trip. It reduces the reactor power and maintains the stability of the reactor. The drive time measurement data of the selective control rod is important for the safety evaluation of the reactor.

However, although the conventional control rod drive time measuring device has the function of measuring the selection control rod drive time, when all the control rod insertion signals are generated immediately after the selection control rod insertion signal is generated, the selection control rod drive time of There is a problem that measurement is not possible.

The present invention has been made in view of such a background, and provides a control rod drive time measuring device having a function of simultaneously performing selective control rod drive time measurement and total control rod drive time measurement. With the goal.

[0011]

In order to achieve the above object, the control rod drive time measuring apparatus according to the present invention provides a selective control rod insertion signal and all control rod insertion signals and control rod positions from a reactor protection system. Input means for inputting a control rod position detection signal from the control rod position detection means for detection, and calculation of the drive time of the selected control rod based on the control rod position detection signal from the selection control rod insertion signal input from this input means Selection control rod drive time calculation means, selection control rod drive time data storage means for storing the drive time of the selection control rod calculated by the selection control rod drive time calculation means, and all input data from the input means. All control rod drive time calculation means for calculating drive time of all control rods based on the control rod position detection signal from the control rod insertion means, and drive of all control rods calculated by this all control rod drive time calculation means A total control rod drive time data storage means for storing the interval, and an output means for outputting the data stored in the selected control rod drive time data storage means and the total control rod drive time data storage means. And

[0012]

In the control rod drive device having such a configuration, when the selection control rod insertion signal is input, the selection control rod drive time calculating means calculates the drive time of the selection control rod based on the control rod position detection signal. The calculated time is stored in the selection control rod drive time data storage means. When all control rod insertion signals are input, the drive time of all control rods is calculated based on the control rod position detection signal, and this time is stored in the selected control rod drive time data storage means.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a control rod drive time measuring device according to an embodiment of the present invention. Figure 2
The same parts as those in FIG.

In FIG. 1, a control rod drive time measuring device 1
A selection control rod drive time calculator 12 for measuring the drive time of the selection control rod by inputting a selection control rod insertion signal and a control rod position detection signal via the input / output device 5, and a selection for storing the result. A control rod drive time data storage device 13, and a total control rod drive time calculator 14 for measuring the drive time of all control rods by inputting all control rod insertion signals and control rod position detection signals via the input / output device 5. A total control rod drive time data storage device 15 for storing the result is provided.

In the control rod drive device 1 having the above-mentioned structure, the selective control rod insertion signal is transmitted from the reactor protection system board 2, and the input / output device 5 provided in the control rod drive time measuring device 1 is sent. When input, the selection control rod drive time calculator 12
The drive time is measured based on the control rod position detection signal 400 of the control rod position detection sensor 4, and the result is stored in the selected control rod drive time data storage device 13. Further, the arithmetic unit 12 is
Based on the selection control rod selection signal 500 from the reactor protection system test panel 3, the diagnosis that the selection control rod is normally driven is also performed.

When the control rod insertion signal 200 is inputted during the measurement of the control rod drive time, the control rod drive time calculator 14 controls the control rod position detection sensor while the selection control rod drive time measurement is continued. The drive time is calculated based on the signal of No. 4 and the data is stored in the total control rod drive time data storage device 15.

By operating the keyboard 11, the operator can output the selected control rod drive time data and the total control rod drive time to the CRT 9 or the printer 10 optionally via the interface 8.

As described above, the selection control rod drive time calculator,
It has the same memory device, all control rod drive time arithmetic unit and the same memory device individually, and the drive time is measured independently by the selected control rod insertion signal and all control rod insertion signal from the reactor protection system panel. And data storage can be performed. Therefore, even if all the control rod insertion signals are generated immediately after the selection control rod insertion signal is generated, the selection control rod drive time can be measured and this data can be stored. It is also possible to confirm whether the selected control rods were operating normally before inserting all the control rods at the time of the above event.

[0019]

As described above, according to the present invention, the selection control rod drive time calculation means and the storage means and the total control rod drive time calculation means and the storage means are individually provided. And, the drive time can be measured and the data can be stored independently based on all the control rod insertion signals. Therefore, even if selection and insertion of all control rods overlap, each control rod drive time can be reliably measured, and there is an effect that the safety evaluation of the reactor can be performed more accurately from these measurement results. ..

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a control rod drive time measuring device according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a conventional control rod drive time measuring device.

[Explanation of symbols]

 1 ... Control rod drive time measuring device 2 ... Reactor protection system panel 3 ... Reactor protection system test panel 4 ... Control rod position detection sensor 5 ... Input / output device 6 ... Calculator 7 ... Memory device 8 ... Interface 9 ... CRT 10 ... Printer 11 ... Keyboard 12 ... Selection control rod drive time calculator 13 ... Selection control rod drive time data storage device 14 ... All control rod drive time calculator 15 ... All control rod drive time data storage device

Claims (1)

[Claims] 1. Input means for inputting a control rod position detection signal from a control rod position detection means for detecting a selective control rod insertion signal and all control rod insertion signals and a control rod position signal from a reactor protection system, and this input means. The selection control rod drive time calculating means for calculating the drive time of the selection control rod based on the control rod position detection signal from the selection control rod insertion signal input from Selection control rod drive time data storage means for storing the drive time of the selection control rods, and calculation of drive time of all control rods based on the control rod position detection signal from all control rod insertion signals input from the input means. Total control rod drive time calculation means for performing, total control rod drive time data storage means for storing the drive time of all control rods calculated by the total control rod drive time calculation means, and the selected control rod drive time data record A control rod drive time measuring device comprising a storage means and an output means for outputting the data stored in the total control rod drive time data storage means.