GB2531679A

GB2531679A - Auxiliary control method for nuclear power plant operation, and device and system therefor

Info

Publication number: GB2531679A
Application number: GB1602103.2A
Authority: GB
Inventors: Xian Chunyu; Tan Ke; Mei Shibai; Cheng Bo; Yu Zhenglong; Shi Ji; Zhang Xuegang; Zhang Jianbo; Xu Xiaomei; Zou Jie; Zhang Gang; Mao Ting; Zhong Liping; Guo An
Original assignee: China General Nuclear Power Corp; China Nuclear Power Engineering Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Engineering Co Ltd
Priority date: 2013-07-15
Filing date: 2013-11-23
Publication date: 2016-04-27
Also published as: GB201602103D0; WO2015007039A2; WO2015007039A3

Abstract

An auxiliary control method, control device and system for nuclear power plant operation, said method comprising: logging in to a nuclear power plant auxiliary control system; sending, by means of the auxiliary control system, a command to shut down the main control system of the nuclear power plant; execution by the main control system of shutdown operations according to said command. Transmission by an auxiliary control system of a command to shut down the main control system of the nuclear power plant avoids, under emergency conditions when control has been lost, the entry by unauthorized persons to the main control room and to workstations of operational personnel to execute illegal operations jeopardizing the safe operation of the plant.

Description

SPECIFICATION

AUXILIARY CONTROL METHOD FOR NUCLEAR POWER PLANT OPERATION, AND DEVICE AND SYSTEM THEREFOR

CROSS-REFERENCE TO RELATED APPLICATION

[0000] The present invention claims priority of Chinese patent application number CN 201310302493.X filed July 15, 2013 and priority of Chinese patent application number CN 201310302653.0 filed July 18, 2013.

FIELD OF THE INVENTION

[0001] The present invention generally relates to control field of nuclear power plants and, more particularly, to an auxiliary control method for nuclear power plant operation, and device and system therefor.

BACKGROUND OF THE INVENTION

[0002] Control room of a nuclear power plant, also called main control room, is the operation control center of a nuclear power plant. Via operating equipments in the main control room, the operating personnel can monitor and control the overall nuclear power plant. With the improvement of the automation level of the production equipments in the nuclear power plant, the nuclear power plant has advanced control room mainly based on the computer technology. Via digital operation, digital monitoring, diagnose, control and protection of the process system and equipments in the nuclear power plant can be realized. Digital main control room workstation generally includes a nuclear island operator workstation (OWP-NI), a conventional island operator workstation (OWP-CI), a supervisor workstation (OWP-US) and a safety engineer workstation (OWP-SE). Auxiliary control point corresponds to the main control room. The auxiliary control point can control and monitor the nuclear power plant when the main control room and the operator workstation fail to function properly.

[00031 At present, auxiliary control point of the nuclear power plant in construction almost realizes digital operation. When the main control room and the operator workstation of the nuclear power plant is unavailable, the operator cannot enter the main control room and the operator workstation to operate properly, such as the main control room and the operator workstation is in fire, excessive smoke dust or dangerous gas enters the main control room or the operator workstation, the main control room or the operator workstation area is severely damaged, major failure happens to the equipments in the main control room. In this case, the operator can realize auxiliary operation of the nuclear power plant via the auxiliary control point. When the main control room and the operator workstation fail to be closed timely in emergency, unauthorized personnel still can operate the nuclear power plant via the software running in the operator workstation, which may affect the safety of the nuclear power plant. Therefore, how to prevent unauthorized personnel from entering the main control room and the operator workstation out of control in emergency and executing illegal operations which may endanger the safety of the nuclear power plant is an urgent problem to be solved.

[0004] In view of the foregoing, what is needed, therefore, is to provide an auxiliary control method, device and system for operation of nuclear power plant.

SUMMARY OF THE INVENTION

[0005] One object of the present invention is to provide an auxiliary control method for nuclear power plant operation, and device and system therefor, wherein the auxiliary control system of the nuclear power plant sends a command to shut down the main control system of the nuclear power plant, which can prevent unauthorized personnel from entering the main control room and the operator workstation of the nuclear power plant out of control in emergency and executing operations which may endanger the safety of the nuclear power plant.

[0006] According to one embodiment of the present invention, an auxiliary control method for nuclear power plant operation includes the steps of: obtaining a start command sent by a transfer switch; logging onto an auxiliary control system of the nuclear power plant; sending a command to shut down a main control system of the nuclear power plant via the auxiliary control system; and executing shutdown operation by the main control room according to the command.

[0007] According to one aspect of the present invention, logging onto the auxiliary control system of the nuclear power plant includes logging onto the auxiliary control system of the nuclear power plant according to the start command.

[0008] According to one aspect of the present invention, the method further includes prior to the auxiliary control system sends the command to shut down the main control system of the nuclear power plant, determining whether the auxiliary control system executing activation operation by a logical processing unit according to the start 20 command.

[0009] According to one aspect of the present invention, the transfer switch sends a shutdown command to the main control system if the auxiliary control system executes activation operation according to the start command.

100101 According to one aspect of the present invention, the transfer switch does not send the shutdown command to the main control system if the auxiliary control system does not execute activation operation according to the start command.

[0011] According to one aspect of the present invention, the main control system and the auxiliary control system are controlled by three transfer switches, if at least two transfer switches of the three transfer switches are in main control system open state, the nuclear power plant is controlled by the main control system.

[0012] According to one aspect of the present invention, if at least two transfer switches of the three transfer switches are in auxiliary control system open states, the nuclear power plant is controlled by the auxiliary control system.

[0013] According to one aspect of the present invention, the method further includes displaying active state and inactive state via a status indicator of the main control system and the auxiliary control system.

[0014] According to one aspect of the present invention, logging onto the auxiliary control system of the nuclear power plant comprising: the auxiliary control system of the nuclear power plant popping out a prompt of "please enter user's name and password", and popping out a password input box and character cursor; if characters entered into the password input box accord with the preset password, entering an auxiliary control operation interface of the nuclear power plant.

[0015] According to one aspect of the present invention, if the characters entered in the password input box fails to accord with the preset password, prompting incorrect password entered and entering the password again.

100161 According to one aspect of the present invention, sending a command to shut down the main control system of the nuclear power plant via the auxiliary control system includes: clicking a button of "exit control room system operation" or a button of "shut down control room operator workstation" at an auxiliary control operating interface of the nuclear power plant.

[0017] According to one aspect of the present invention, the method further includes the auxiliary control operation interface of the nuclear power plant popping up a confirm button of "exit control room operation is confirmed?" or "shut down the control room operator workstation?".

100181 According to one embodiment of the present invention, an auxiliary control method for nuclear power plant operation, including the steps of: sending a start command to an auxiliary control system; sending a shutdown command to the main control system if a logical processing unit determines the auxiliary control system has executed an activation operation according to the start command; and the main control system executing stop operation according to the shutdown command.

[0019] According to one aspect of the present invention, if the auxiliary control system fails to execute activation operation according to the start command, the transfer 20 switch does not send the shutdown command to the main control system.

[0020] According to one aspect of the present invention, the main control system and the auxiliary control system are controlled by three transfer switches, if at least two transfer switches of the three transfer switches are in main control system open states, the nuclear power plant is controlled by the main control system.

[0021] According to one aspect of the present invention, if at least two transfer switches of the three transfer switches are in auxiliary control system open states, the nuclear power plant is controlled by the auxiliary control system.

[0022] According to one aspect of the present invention, the method further includes displaying active state and inactive state via a status indicator of the main control system and the auxiliary control system.

[0023] According to one embodiment of the present invention, an auxiliary control I 0 device for nuclear power plant operation includes: an acquisition module, configured to obtain a start command sent by a transfer switch; a login module, configured to login onto an auxiliary control system of the nuclear power plant according to the start command; and a forward module, configured to forward a command to shut down a main control system of the nuclear power plant via the auxiliary control system.

[0024] According to one embodiment of the present invention, the forward module is further configured to forward the shut down command sent by a transfer switch to the main control system, if the auxiliary control system executes activation operation according to the start command.

[0025] According to one aspect of the present invention, the login module login onto the auxiliary control system according to the start command comprises: receiving user's name and password according to prompt of "please enter user's name and password" and password input box and character cursor popped up by the auxiliary control system of the nuclear power plant.

[0026] According to one aspect of the present invention, if characters entered into the password input box accord with a preset password, the auxiliary control operation interface of the nuclear power plant is entered via the login module.

[0027] According to one embodiment of the present invention, a switching device for a main control and an auxiliary control includes: a first send module, configured to send a start command to an auxiliary control system; and a second send module, configured to send a shutdown command to an main control system if a logical processing unit determines the auxiliary control system has executed activation operation according to the start command, so that the main control system executes stop operation according to the shutdown command.

100281 According to one aspect of the present invention, if the auxiliary control system fails to execute activation operation according to the start command, the second send module does not send a shutdown command to the main control system.

100291 According to one embodiment of the present invention, an auxiliary control system for nuclear power plant operation includes: an auxiliary control platform of the nuclear power plant, configured to login onto an 20 auxiliary control system of the nuclear power plant, and send a command to shut down the main control system of the nuclear power plant via an auxiliary control system; and a main control platform of the nuclear power plant, configured to execute the shutdown operation via the main control system of the nuclear power plant according to the command sent by the auxiliary control platform of the nuclear power plant.

[0030] According to one aspect of the present invention, the system further includes a switching device, configured to send the start command to the auxiliary control platform of the nuclear power plant, so that the auxiliary control platform of the nuclear power plant login on to an auxiliary control system of the nuclear power plant according to the start command.

[0031] According to one aspect of the present invention, the switching device is further configured to determine whether the auxiliary control system executes activation operation according to the start command.

100321 According to one aspect of the present invention, if the auxiliary control system executes activation operation according to the start command, the switching device sends the shutdown command to the main control system.

[0033] According to one aspect of the present invention, if the auxiliary control system fails to execute activation operation according the start command, the switching device does not send a shutdown command to the main control system.

[0034] According to one aspect of the present invention, the switching device includes three transfer switches, if at least two transfer switches of the three transfer switches are in main control system open states, the nuclear power plant is controlled by 20 the main control system.

100351 According to one aspect of the present invention, if at least two transfer switches of the three transfer switches are in auxiliary control system open states, the nuclear power plant is controlled by the auxiliary control system.

100361 According to one aspect of the present invention, the auxiliary control system of the nuclear power plant of the auxiliary control platform of the nuclear power plant pops up a prompt of "please enter user's name and password", as well as pops up password input box and character cursor; if characters entered into the password input box accord with a preset password, auxiliary control operation interface of the nuclear power plant is entered.

[0037] According to one aspect of the present invention, if the characters entered into the password input box fail to accord with the preset password, incorrect password entered and entering the password again are prompted.

[0038] According to one aspect of the present invention, the auxiliary control platform of the nuclear power plant sends a command to shut down the main control system of the nuclear power plant via the auxiliary control system, comprising: the auxiliary control platform of the nuclear power plant clicks a button of "exit control room system operation" or a button of "shut down control room operator workstation" at an auxiliary control operation interface of the nuclear power plant.

[0039] According to one aspect of the present invention, the auxiliary control operation interface of nuclear power plant of the auxiliary control platform of the nuclear power plant pops up a confirm button of "exit control room operation?" or "shut down the control room operator workstation?".

[0040] According to one aspect of the present invention, if the confirm button is clicked, the control room system of the main control platform of the nuclear power plant executes the shutdown operation according to the command.

[0041] Compared with the prior art, the present invention has the following advantages. Via logging onto the auxiliary control system of the nuclear power plant and sending a command to shut down the main control system of the nuclear power plant by mean of the auxiliary control system, the main control system can execute shutdown operation according the command, which can prevent the main control room and operator workstations failing to be shut down timely in emergency, and prevent unauthorized personnel from controlling the nuclear power plant via the software still running in the operator workstation and further endangering the sate operation of the nuclear power plant. At the same time, due to the confirm button set in the interface of the auxiliary control system of the nuclear power plant, shutdown of the main control room due to incorrect operation can be avoided.

BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Other advantages and novel features will be drawn from the following detailed description of the preferred embodiment with the attached drawings. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiment of the present invention and, together with a general description of the invention given above, and the detailed description of the embodiments given below, serve to explain the principles of the invention, in which: [0043] Fig. 1 illustrates a flowchart of an auxiliary control method for nuclear power plant operation according to one embodiment of the present invention; 100441 Fig. 2 illustrates a flowchart of an auxiliary control method for nuclear power plant operation according to another embodiment of the present invention; and [0045] Fig. 3 illustrates a diagram of an auxiliary control system for nuclear power plant operation according to one embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

100461 Example embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

10047J Digital main control room workstation generally includes a nuclear island operator workstation (OWP-NI), a conventional island operator workstation (OWP-CI), a supervisor workstation (OWP-US) and a safety engineer workstation (OWP-SE). The auxiliary control point corresponds to the main control room. The auxiliary control point can control and monitor the nuclear power plant when the main control room and the operator workstation fail to function properly. When the main control room of the nuclear power plant is not available, the operators move to the auxiliary control point. In the auxiliary control point, according to the judgment of the safety state of the control room of the nuclear power plant, the operators determine whether shut down the control function of the main control room or not. In emergency, if the main control room of the nuclear power plant fails to determine whether unauthorized personnel can enter the nuclear power plant or not, it is necessary to control the operations of the main control room, so as to prevent unauthorized personnel from entering the main control room and controlling the nuclear power plant via the running software of the nuclear power plant failed to be shut down in the operator workstation.

100481 Fig. 1 provides an auxiliary control method for nuclear power plant operation, including the steps of Step 101, logging onto an auxiliary control system of a nuclear power plant.

100491 More specifically, the auxiliary control system of the nuclear power plant is accessed from the operator workstation in the auxiliary control point. Function buttons of "remote exit control room operation" and "shut down control room operator workstation" are set in the system level menu of the auxiliary control system of the nuclear power plant.

[0050] Step 103, sending a command to shut down the main control system of the nuclear power plant via the auxiliary control system.

[0051] More specifically, step 103 includes entering the auxiliary control system of the nuclear power plant, and clicking the buttons of "remote exit control room operation" or "shut down control room operator workstation" in the operation interface. The auxiliary control system sends a command to the main control system of the nuclear power plant via wireless, WEFT, optical fiber or other wired mode.

[0052] Step 105, the main control system executing shutdown operations according to the command.

100531 According to the embodiment of the present invention, via logging onto the auxiliary control system of the nuclear power plant, and sending a command to shut down the main control system of the nuclear power plant via the auxiliary control system, the main control system can execute the shutdown operations according to the command, which can prevent the main control room and the operator workstations from failing to be shut down timely in emergency, and prevent unauthorized personnel from controlling the nuclear power plant via the software still in running in the operator workstation and further endangering the operation of the nuclear power plant.

100541 Referring to Fig. 2, according to another embodiment of the present invention, an auxiliary control method for nuclear power plant operation, including the steps of: Step 201, start an auxiliary control system of the nuclear power plant.

[0055] Step 203, the auxiliary control system pops up a prompt of "please enter password" and pops up a password input box and character cursor. If the password entered is wrong, another prompt will pop up to remind enter the password again.

[0056] Alternatively, the number of entering the password in a certain period of time can be set in the system. After the number is exceeded, if the password entered is still wrong, the auxiliary control system of the nuclear power plant is shut down 10 automatically.

100571 Step 205, entering the operation interface of the auxiliary control system of the nuclear power plant; If the password entered is correct, the operation interface of the auxiliary control system of the nuclear power plant is entered; [0058] Step 207, clicking the button of "exit control room system operation" or "shut down operator workstation of the control room"; 100591 Step 209, popping up a confirm button of "remote exit control room operation?" or a confirm button of "shut down control room operator workstation?"; [0060] Step 211, the control room system executing the shutdown operation according to the command if the confirm button is clicked.

[0061] Via logging onto the auxiliary control system of the nuclear power plant and sending a command to shut down the main control system of the nuclear power plant via the auxiliary control system, the main control system can execute the shutdown operation according to the command, which can prevent the main control room and the operator workstations from failing to be shut down timely in emergency, and prevent unauthorized personnel from controlling the nuclear power plant via the software still running in the operator workstation and endangering the operation of the nuclear power plant. At the same time, due to the confirm button set in the interface of the auxiliary control system of the nuclear power plant, shutdown of the main control room due to incorrect operation can be avoided.

100621 Fig. 3 provides a diagram of an auxiliary control system for operation of a nuclear power plant. The auxiliary control system for operation of a nuclear power plant includes an auxiliary control platform 301 of the nuclear power plant and a main control platform 303 of the nuclear power plant.

[0063] The auxiliary control platform 301 of the nuclear power plant is configured to login onto an auxiliary control system of the nuclear power plant, and send a command to shut down the main control system of the nuclear power plant via the auxiliary control 15 system.

[0064] The main control platform 303 of the nuclear power plant is configured to execute shutdown operation via the main control system of the nuclear power plant according to the command sent by the auxiliary control platform 301 of the nuclear power plant.

[0065] Alternatively, the auxiliary control system of the nuclear power plant of the auxiliary control platform 301 of the nuclear power plant pops up a prompt of "please enter password" and pops up a password input box and character cursor. If the characters entered in the password input box accord with a preset password, the operation interface of the auxiliary control system of the nuclear power plant is accessible.

100661 Further, if the characters entered in the password input box do not accord with the preset password, a prompt is pop up to indicate incorrect password and enter the password again [0067] Further, the auxiliary control platform 301 of the nuclear power plant sends a command to shut down the main control system of the nuclear power plant via the auxiliary control system of the nuclear power plant. The auxiliary control platform 301 of the nuclear power plant clicks the button of "remote exit control room operation" or the button of "shut down operator workstation in the control room" at the of the auxiliary control operation interface of the nuclear power plant.

[0068] The auxiliary control operation interface of the auxiliary control platform 301 of the nuclear power plant pops up a confirm button of "exit control room operation?" or "shut down the control room operator workstation?".

[0069] If confirm button is clicked, the control room system of the main control platform 303 of the nuclear power plant executes the shutdown operation according to the 15 command.

[0070] The implement method and procedure of the system according to the present invention are almost the same as detailed in the previous embodiment of the present invention, and will not be detailed further.

[0071] In view of the foregoing, it can be clearly seen that, compared with the prior art, the present invention has the following advantages. Via logging onto the auxiliary control system of the nuclear power plant and sending a command to shut down the main control system of the nuclear power plant by mean of the auxiliary control system, the main control system can execute shutdown operation according the command, which can prevent the main control room and operator workstations failing to be shut down timely in emergency, and prevent unauthorized personnel from controlling the nuclear power plant via the software still running in the operator workstation and further endangering the sate operation of the nuclear power plant. At the same time, due to the confirm button set in the interface of the auxiliary control system of the nuclear power plant, shutdown of the main control room due to incorrect operation can be avoided.

[0072] Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to he included within the scope of the appended claims. Moreover, although the foregoing descriptions and the associated drawings describe example embodiments, it should be appreciated that alternative embodiments without departing from the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

WHAT IS CLAIMED IS: 1. An auxiliary control method for nuclear power plant operation, comprising the steps of: obtaining a start command sent by a transfer switch; logging onto an auxiliary control system of the nuclear power plant; sending a command to shut down a main control system of the nuclear power plant via the auxiliary control system; and executing shutdown operation by the main control room according to the command.
2. The method of claim 1, wherein logging onto the auxiliary control system of the nuclear power plant comprises logging onto the auxiliary control system of the nuclear power plant according to the start command.
3. The method of claim 2, further comprising determining whether the auxiliary control system executing activation operation by a logical processing unit according to the start command prior to the auxiliary control system sends the command to shut down the main control system of the nuclear power plant.
4. The method of claim 3, wherein the transfer switch sends a shutdown command to the main control system if the auxiliary control system executes activation operation according to the start command.
5. The method of claim 4, wherein the transfer switch does not send the shutdown 20 command to the main control system if the auxiliary control system does not execute activation operation according to the start command.
6. The method of claim 5, wherein the main control system and the auxiliary control system are controlled by three transfer switches, if at least two transfer switches of the three transfer switches are in main control system open state, the nuclear power plant is controlled by the main control system.
7. The method of claim 6, wherein if at least two transfer switches of the three transfer switches are in auxiliary control system open states, the nuclear power plant is controlled by the auxiliary control system.
8. The method of claim 7, further comprising displaying active state and inactive state via a status indicator of the main control system and the auxiliary control system.
9. The method of claim 8, wherein logging onto the auxiliary control system of the nuclear power plant comprising: the auxiliary control system of the nuclear power plant popping out a prompt of "please enter user's name and password", and popping out a password input box and character cursor; if characters entered into the password input box accord with the preset password, entering an auxiliary control operation interface of the nuclear power plant.
10. The method of claim 9, wherein if the characters entered in the password input box fails to accord with the preset password, prompting incorrect password entered and entering the password again.
11. The method of claim 10, wherein sending a command to shut down the main control system of the nuclear power plant via the auxiliary control system comprises: clicking a button of "exit control room system operation" or a button of "shut down control room operator workstation" at an auxiliary control operating interface of the nuclear power plant.
I 2. The method of claim I I, further comprising the auxiliary control operation interface of the nuclear power plant popping up a confirm button of "exit control room operation?" or "shut down the control room operator workstation?".
13. The method of claim 12, further comprising if the confirm button is clicked, the control room system executes the shutdown operation according to the command.
14. An auxiliary control method for nuclear power plant operation, comprising the steps of: sending a start command to an auxiliary control system; sending a shutdown command to a main control system if a logical processing unit determines the auxiliary control system has executed an activation operation according to 10 the start command; and the main control system executing stop operation according to the shutdown command.
15. The method of claim 14, wherein if the auxiliary control system fails to execute activation operation according to the start command, the transfer switch does not send the shutdown command to the main control system.
16. The method of claim 15, wherein the main control system and the auxiliary control system are controlled by three transfer switches, if at least two transfer switches of the three transfer switches are in main control system open states, the nuclear power plant is controlled by the main control system.
17. The method of claim 16, wherein if at least two transfer switches of the three transfer switches are in auxiliary control system open states, the nuclear power plant is controlled by the auxiliary control system.
18. The method of claim 17, further comprising displaying active state and inactive state via a status indicator of the main control system and the auxiliary control system.
19. An auxiliary control device for nuclear power plant operation, comprising: an acquisition module, configured to obtain a start command sent by a transfer switch; a login module, configured to login onto an auxiliary control system of the nuclear power plant according to the start command; and a forward module, configured to forward a command to shut down a main control system of the nuclear power plant via the auxiliary control system.
20. The device of claim 20, wherein the forward module is further configured to forward the shut down command sent by a transfer switch to the main control system, if the auxiliary control system executes activation operation according to the start command.
21. The device of claim 20, wherein the login module login onto the auxiliary control system according to the start command comprises: receiving user's name and password according to prompt of "please enter user's name and password" and password input box and character cursor popped up by the auxiliary control system of the nuclear power plant.
22. The device of claim 20, wherein if characters entered into the password input box accord with a preset password, the auxiliary control operation interface of the nuclear power plant is entered via the login module.
23. A switching device for a main control and an auxiliary control, comprising: a first send module, configured to send a start command to an auxiliary control system; and a second send module, configured to send a shutdown command to an main control system if a logical processing unit determines the auxiliary control system has executed activation operation according to the start command, so that the main control system executes stop operation according to the shutdown command.
24. The device of claim 23, wherein if the auxiliary control system fails to execute 5 activation operation according to the start command, the second send module does not send a shutdown command to the main control system.
25. An auxiliary control system for nuclear power plant operation, comprising: an auxiliary control platform of the nuclear power plant, configured to login onto an auxiliary control system of the nuclear power plant, and send a command to shut down a main control system of the nuclear power plant via the auxiliary control system; and a main control platform of the nuclear power plant, configured to execute the shutdown operation via the main control system of the nuclear power plant according to the command sent by the auxiliary control platform of the nuclear power plant.
26. The system of claim 25, further comprising a switching device, configured to send the start command to the auxiliary control platform of the nuclear power plant, so that the auxiliary control platform of the nuclear power plant login on to an auxiliary control system of the nuclear power plant according to the start command.
27. The system of claim 26, wherein the switching device is further configured to determine whether the auxiliary control system executes activation operation according to 20 the start command.
28. The system of claim 27, wherein if the auxiliary control system executes activation operation according to the start command, the switching device sends the shutdown command to the main control system.
29. The system of claim 28, wherein if the auxiliary control system fails to execute activation operation according the start command, the switching device does not send a shutdown command to the main control system.
30. The system of claim 29, wherein the switching device comprises three transfer switches, if at least two transfer switches of the three transfer switches are in main control system open states, the nuclear power plant is controlled by the main control system.
3 I. The system of claim 30, wherein if at least two transfer switches of the three transfer switches are in auxiliary control system open states, the nuclear power plant is controlled by the auxiliary control system.
32. The system of claim 31, wherein the auxiliary control system of the nuclear power plant of the auxiliary control platform of the nuclear power plant pops up a prompt of "please enter user's name and password", and pops up password input box and character cursor; if characters entered into the password input box accord with a preset password, auxiliary control operation interface of the nuclear power plant is entered.
33. The system of claim 32, wherein if the characters entered into the password input box fail to accord with the preset password, incorrect password entered and entering the password again are prompted.
34. The system of claim 33, wherein the auxiliary control platform of the nuclear power plant sends a command to shut down the main control system of the nuclear power plant via the auxiliary control system, comprising: the auxiliary control platform of the nuclear power plant clicks a button of "exit control room system operation" or a button of "shut down control room operator workstation" at an auxiliary control operation interface of the nuclear power plant.
35. The system of claim 34, wherein the auxiliary control operation interface of nuclear power plant of the auxiliary control platform of the nuclear power plant pops up a confirm button of "exit control room operation?" or "shut down the control room operator workstation?".
36. The system of claim 35, wherein if the confirm button is clicked, the control room 5 system of the main control platform of the nuclear power plant executes the shutdown operation according to the command.