JPH0944072A - Online core simulator - Google Patents

Abstract

(57) [Abstract] [Purpose] An online core simulator suitable for improving the efficiency of the operation confirmation of the control device for controlling the reactor and for grasping the future operation status of the control device during the reactor operation in advance. To provide. [Structure] In the online core simulator that simulates the behavior of the reactor and verifies the control device,
A reactor control device and a control device simulation device connected with the reactor core simulation device through the interface device, and a control device simulation device are selected, and offline simulation is performed by connecting with the core simulation device, or Provide a simulation setting means for selecting a control device and setting whether to execute offline simulation by connecting to the core simulating means, and a start management means for managing start timing for executing offline simulation faster than real time of online simulation. It is characterized by

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-line core simulator for verifying a control device for a nuclear reactor.

[0002]

2. Description of the Related Art A conventional online core simulator is
As disclosed in Japanese Patent Laid-Open No. 59-58462, the initial data for starting the simulation includes the initial value data created in advance and the initial value data periodically stored during the simulation by the so-called backtrack function. The number of these initial value data is limited by the memory capacity of the computer. For example, in order to confirm the control characteristics of the control device in a certain core state, pay attention to the stored initial value data. It was necessary to select the data that was closest to the core condition and to reproduce the control procedure in real time from that point. To confirm the operation of the control device, as described in Japanese Patent Laid-Open No. 63-307876, the control device and the equivalent of the control device represented by software are individually connected to the controlled system and their responses are compared. However, in this method, since the individual control system is provided, the initial small control deviation is fed back to the controlled system and the deviation expands, resulting in different plant states between the two. It may be difficult to confirm the operation of the control device.
Further, as the operation information for the control during operation, as described in Japanese Patent Application Laid-Open No. 58-137874, the subsequent behavior of the plant state of interest is simulated at high speed to be used as a material for determining the operation operation. No consideration is given to providing operation information by predicting the behavior of the plant under automatic control by high-speed simulation. On the other hand, at present, an automatic control rod control device is being introduced because of the need to start the reactor in a reasonable time. For example, in the critical operation of the reactor, this control device needs to monitor the reactor cycle with a quick response and control the pull-out operation of the control rod. Therefore, in order to confirm the operation of the control logic of this controller, a core simulator that emits a process state signal that simulates the behavior of the reactor in real time and that has responsiveness to the process control signal of the controller is required. It was Further, in order to increase the reliability of the automatic control, it is desired to confirm the operation of the control device during operation and provide a driving report for the automatic control by predictive calculation.

[0003]

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to improve the efficiency of checking the operation of the control device and to predict the future operation status of the control device while the reactor is in operation. It is to provide an online core simulator suitable for understanding.

[0004]

The above-mentioned object is to select a control device and a control device simulating means for a reactor in which core simulating means for a nuclear reactor is connected through an interface means, and a control device simulating means. And the simulation setting means to set whether to execute the offline simulation by connecting with or to select the control unit and execute the offline simulation by connecting with the core simulation means, and the offline simulation is faster than the real time of the online simulation. This is achieved by providing a start-up management means for managing the start-up timing to be executed in. Further, control content display means for sending a process state signal output from the core simulating means to the control device simulating means together with the control device and displaying the process control signal generated by the control device simulating means at the same time as the process control signal of the control device is provided. It is achieved by Further, it is achieved by providing process state signal input means for inputting actual reactor data as a process state signal in place of the control device simulation means.

[0005]

According to the present invention, the offline simulation can be executed faster than the real time of the online simulation, and the offline simulation and the online simulation can be continuously transferred to each other. Perform offline simulation at high speed up to the plant state, and then shift to online simulation. Further, in order to confirm in advance the automatic control status from the point of interest during execution of the online simulation, the offline simulation is switched from the point of interest to perform high-speed simulation, and the process state signal of interest is grasped. In order to confirm the operation of the control device, the process state signal from the core simulating means is input to the control device for control, and at the same time, it is input to the control device simulating means to operate only the control logic. The control contents of the control device and the control device simulation means are compared with the status signal. Also, during reactor operation, the process state signal of the actual machine is input to the control device simulation means instead of the core simulation means,
Only the control logic is operated, and the operation of the control device is checked in real time during operation.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an online core simulator showing an embodiment of the present invention. This online core simulator is composed of an input unit 1 for setting and operating data of a system simulation (core simulation) consisting of a reactor core and a control device, a simulation setting means 2 for setting the simulation, and a program simulating the reactor. The core simulation means 4, the control device 8 for controlling the nuclear reactor, the control device simulation means 7 for simulating the control logic of the control device 8, the display means 5 for displaying the calculation result of the core simulation, the core simulation means 4, and the control device simulation. Means 7
Also, it comprises an activation managing means 3 for managing the activation of each program for executing the calculation result display means 5, a control device 8 and an interface means 6 for connecting the control device simulating means 7 and the core simulating means 4. The input unit 1 has a function of selecting whether to perform an offline simulation or an online simulation, and setting which core state as an initial state and to what extent the simulation is performed. When the off-line simulation is selected, the simulation setting means 2 selects the control device simulating means 7 and makes settings for executing the simulation by connecting to the core simulating means 4 via the interface means 6 and online. When the simulation is selected, it has a function of selecting the control device 8 and connecting to the core simulating means 4 through the interface means 6 to perform settings for executing the simulation. Startup management means 3
Has a function of setting an online simulation to be executed in real time and an offline simulation to be executed at a speed faster than real time.

Next, the operation of this embodiment will be described using the processing flow shown in FIG. Here, in FIG. 2, the determination condition A determines whether to execute the offline simulation, the determination condition B determines whether to continue the core simulation, and the determination condition C determines whether the initial target is reached.
First, the input unit 1 selects whether to perform an offline simulation or an online simulation, and sets which core state is an initial state and to what extent the simulation is performed (S1). When the off-line simulation is selected, the simulation setting means 2 selects the control device simulating means 7, makes a setting for connecting to the core simulating means 4 through the interface means 6 to execute the simulation, and also online. When the simulation is selected, the controller 8
Is selected, and the setting for connecting to the core simulating means 4 through the interface means 6 and executing the simulation is performed (S3). Then, the core simulation means 4 is activated at the timing set by the activation management means 3 to simulate the core state between the set time steps (S4). As a result of this simulation, for example, a process state signal as shown in FIG.
5) If the offline simulation is executed (S
6), it transmits from the core simulating means 4 to the control device simulating means 7 (S7). On the other hand, if the online simulation is to be executed (S6), it is transmitted from the core simulation means 4 to the control device 8 (S8). In the control device simulating means 7 or 8, the control logic is operated based on the received process state signal to issue a process control signal as shown in FIG. 4, and the core simulating means is executed via the interface means 6 (S9). Send to 4. During this time, the state of the reactor is graphically displayed by the calculation result display means 5 based on the process state signal (S10). Here, it is determined whether or not the core simulation has reached the initial target set in the input unit 1 (S11). If the initial target has not been reached, the process returns to step S4, while the initial target has been reached. In this case, it is determined whether or not the core simulation is to be continuously executed (S12). When the core simulation is to be continuously executed, the offline simulation or the online simulation is selected by the input unit 1, and the same processing is executed thereafter. Here, when the simulation to be executed is an off-line simulation, the activation management means 3 sets the activation timing of the core simulation means 4, the control device simulation means 7, and the calculation result display means 5. This start timing is set so that the synchronization is maintained between the programs. Further, when the simulation to be executed is an online simulation, the core simulating means 4 is synchronized with the control cycle of the control device 8.
By exchanging the process control signal with the process state signal, the simulation is realized in real time. Also,
The process state signals shown in FIG. 3 include “neutron count number”, “reactor cycle”, “core flow rate”, “CUW inlet temperature”, “reactor pressure”, “main steam flow rate”, “reactor water level”.
Etc. The process control signals shown in FIG. 4 include "critical mode", "nuclear heating mode", "power increase mode",
There are "output lowering mode", "control rod withdrawal request", "control rod insertion request", "EHC load setting", "RFC load request deviation", and the like.

As described above, in this embodiment, the offline simulation and the online simulation can be continuously transferred to each other. In the case of the offline simulation, the start timing shorter than the real time by the online simulation is set, and the high speed is achieved. Simulation can be performed. Therefore, for example, in order to confirm the operation of the control device at the time of nuclear heating at reactor startup, the core state until the reactor reaches criticality and the reactor cycle stabilizes is created by high-speed offline simulation, Since the online simulation can be switched based on the created result, according to the present embodiment, it is possible to efficiently prepare the initial state of the plant for checking the operation of the control device. Further, in the present embodiment, in order to grasp beforehand the information of the automatic control from the point of interest during the execution of the online simulation, the online simulation should be switched to the offline simulation from the point of interest to execute the simulation at high speed. Can be achieved with.

FIG. 5 shows another embodiment of the present invention. In this embodiment, a difference from the embodiment of FIG. 1 is that a control content display means 9 is provided, and a process state signal from the core simulating means 4 is sent to the control device 8 and the control device simulating means 7 simultaneously via the interface means 6. This is also a point to input.
The procedure for executing the online simulation is similar to that of the embodiment shown in FIG. During execution of the online simulation, the process state signal from the core simulating means 4 is transmitted to the control device 8 via the interface means 6, and the control device 8
The process control signal is transmitted to the core simulating means 4 via the interface means 6. In the present embodiment, the process state signal from the core simulating means 4 is transferred to the interface means 6
The process control signal is transmitted to the control device simulating means 7 together with the control device 8 via the control device 8 and the process control signal generated by the control device simulating means 7 is displayed on the control content display means 9. As a result, the process control signal from the control device 8 and the process control signal generated by the control device simulation means 7 are compared and displayed on the control content display means 9, so that the operation of the control device 8 can be easily confirmed. I can.

FIG. 6 shows a display example of the control content display means 9. Since the control command from the control device 8 is issued by using the control cycle as the minimum unit of time, the control content display means 9 monitors the process control signal at this control cycle. In FIG. 6, when the process state signal is the reciprocal of the reactor cycle and the control command from the control device 8 and the control device simulation means 7 is a control rod drawing request, the common process state signal is used to control Both control contents are displayed on the display means 9 in time series. This means that the operation check of the control device 8 is always performed by the control device simulation means 7, and the operation check of the control device 8 can be performed efficiently.

FIG. 7 shows another embodiment of the present invention. In this embodiment, the difference from the embodiment of FIG. 5 is that a process state signal input means 11 is provided instead of the core simulating means 4, and the actual machine data of the nuclear reactor 10 is input to the process state signal input means 11 as a process state signal. That is the point. In this embodiment, actual machine data of the nuclear reactor 10 is input to the process state signal input means 11 as a process state signal, and the process state signal from the process state signal input means 11 is controlled together with the control device 8 via the interface means 6. The process control signal transmitted to the device simulation unit 7 and generated by the control device simulation unit 7 is displayed on the control content display unit 9. As a result, the process control signal generated by the control device simulating means 7 together with the process control signal from the control device 8 is displayed on the control content display means 9 and the control contents of both are compared, whereby the control device is operating during the reactor operation. The operation confirmation of 8 can be easily performed. As a result, in this embodiment, the soundness of automatic control can be improved by checking the operation of the control device during the operation of the reactor.

FIG. 8 shows a display example of the calculation result display means 5 in each of the embodiments shown in FIGS. 1, 5, and 7. In FIG. 8, the control rod position in the vicinity of the neutron monitor in the neutron source region, the reactor cycle and the neutron count number by the neutron monitor are shown by bar graphs. In particular, these bar graphs are useful screens until the reactor reaches criticality.
The position of the control rod in the reactor can be color-coded according to the extraction depth, the reactor cycle can be color-coded according to the length, and the neutron flux value can be color-coded according to the level magnitude. . Here, the control rod near the neutron monitor represents one of the control rods selected for the extraction operation that is close to the neutron monitor in the neutron source region, and the control rod total insertion state is 100%. However, in this example, the number of neutron monitors was four. As described above, the calculation result display means 5 displays not only the temporal correlation due to the dynamic characteristics of the core but also the correlation with the selection control rods close to the neutron monitor position as a bar graph or by color-coding graphically. It is possible to express and easily display the state of the reactor with a realistic sensation.

[0013]

As described above, according to the present invention,
Since offline simulation can be executed faster than real time, and it is possible to continuously transfer to online simulation, it is possible to easily create a desired plant initial state by executing offline simulation. The work efficiency of checking the operation of the control device can be improved. Further, by switching from online simulation to offline simulation and executing the simulation at high speed during the execution of the online simulation, it is possible to grasp the information of the subsequent automatic control in advance. Further, in order to confirm the operation of the control device, the logic of the control device can be efficiently confirmed by comparing and displaying the control content of the control device simulation means with the actual control content of the control device during execution of the online simulation. I can. Also, in order to confirm the operation of the control device during the reactor operation, the control content of the control device simulation means is displayed in comparison with the actual control content of the control device, so that the logic of the control device can be efficiently confirmed. I can. In addition, it is possible to easily understand the behavior of the nuclear reactor by displaying the parameters correlated with each other in the state of the nuclear reactor like a bar graph and by graphically expressing them in different colors.

[Brief description of drawings]

FIG. 1 is a block diagram of an online core simulator showing an embodiment of the present invention.

[Figure 2] Simulation processing flow chart

[Fig. 3] Example of plant status signal

[Fig. 4] Example of plant control signal

FIG. 5 shows another embodiment of the present invention.

FIG. 6 is an example of control content display of FIG.

FIG. 7 is another embodiment of the present invention.

FIG. 8: Example of calculation result display of online core simulator of the present invention

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input part 2 Simulation setting means 3 Startup management setting means 4 Core simulation means 5 Calculation result display means 6 Interface means 7 Control device simulation means 8 Control device 9 Control content display means 10 Reactor 11 Process state signal input means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Tominaga Inventor Kenji Tominaga 7-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Electric Power & Electric Development Division (72) Hiroki Sano Omika-cho, Hitachi City, Ibaraki Prefecture 7-2-1, Hitachi Ltd. Electric Power & Electric Development Headquarters (72) Inventor Masanori Takamoto 7-2-1, Omika-cho, Hitachi City, Ibaraki Hitachi Electric Power & Electric Development Headquarters

Claims (7)

[Claims] 1. An online reactor core simulator for simulating a behavior of a nuclear reactor to verify a control device, and a reactor control device and a control device simulating means in which reactor core simulating means is connected through interface means, Select the control device simulating means, connect to the core simulating means to execute an offline simulation,
Alternatively, managing the start timing for selecting the control device and setting whether to execute the offline simulation by connecting to the core simulating means and the start timing for executing the offline simulation faster than the real time of the online simulation An on-line core simulator, which is provided with a start-up management means that activates. 2. An online reactor core simulator for simulating the behavior of a nuclear reactor to verify a control device, and a reactor control device and a control device simulating means in which reactor core simulating means are connected via interface means, Select the control device simulating means, connect to the core simulating means to execute an offline simulation,
Alternatively, managing the start timing for selecting the control device and setting whether to execute the offline simulation by connecting to the core simulating means and the start timing for executing the offline simulation faster than the real time of the online simulation And a process state signal output from the core simulating means to the control device simulating means together with the control device, and the process control signal generated by the control device simulating means is the process control signal of the control device. An online core simulator characterized by being provided with control content display means for displaying simultaneously. 3. A display means for displaying the calculation result of the core simulation according to claim 1 or 2, wherein the simulation result of the core state between the time steps set by the activation management means 3 is graphically displayed on the display means. An online core simulator characterized by displaying. 4. The online core simulator according to claim 3, wherein the startup management means manages startup timing of each program for displaying calculation results of offline simulation, online simulation, and core simulation. 5. An on-line core simulator for simulating a behavior of a nuclear reactor to verify a control device, a process state signal input means for inputting actual reactor data as a process state signal, and the process state signal input means. A control device and a control device simulating means of a nuclear reactor connected via an interface means, and selecting the control device simulating means, connecting with the core simulating means to execute an off-line simulation, or A simulation setting means for selecting whether to execute offline simulation by connecting to the core simulation means; and a startup management means for managing startup timing for executing the offline simulation faster than the real time of the online simulation, From the core simulation means Providing control content display means for sending the output process state signal to the control device simulation means together with the control device, and displaying the process control signal generated by the control device simulation means at the same time as the process control signal of the control device. A featured online core simulator. 6. A display means for displaying a calculation result of a core simulation according to claim 5, wherein a simulation result of a core state between time steps set by the activation management means 3 is graphically displayed on the display means. A featured online core simulator. 7. The display means for displaying the calculation result of the core simulation according to claim 3 or 6, wherein the correlated parameters in the state of the nuclear reactor are color-coded according to their sizes, and the bar graph is stereoscopically displayed. An online core simulator characterized by: