Authority management system for nuclear power plant safety level DCS

Abstract

The invention discloses an authority management system for a nuclear power plant safety level DCS, which comprises an electronic key, a central user database, a mirror image database and a maintenancenetwork, and is characterized in that the central user database is arranged at an engineer station; the mirror image database is arranged in each function station; the engineer station is in communication connection with each function station through a maintenance network; an electronic key is used as a port for a user to initiate an authorization request; after the user inserts the electronic key into host equipment of a function station, the host equipment of the function station reads an electronic key identification code of the electronic key and encrypted relevant information of the userand carries out authentication in a mirror image database of the function station; and corresponding operation authority is granted to the user after the authentication is passed, and if the user operation exceeds his / her own authority range, it is determined that the operation is invalid and a prompt is given. Corresponding operation authorities are granted to people with different identities, the unauthorized operation condition of the nuclear safety level DCS is overcome, and system maintenance is facilitated.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant digital instrument control, in particular to an authority management system used for a safety-level DCS of a nuclear power plant. Background technique [0002] The digital control system (Digital Control System, DCS) of the nuclear power plant is the central nervous system of the nuclear power plant, which can make the nuclear power plant run safely and smoothly under any working conditions. The safety-level protection system is the most important control system in the DCS system of a nuclear power plant, which ensures that the nuclear power plant can be brought to a safe state when an accident occurs, so the safety-level protection system is required to have extremely high reliability. [0003] In the unsafe events of DCS, the faults caused by human operation account for a relatively large proportion, especially in the process of modifying control logic, downloading software, forcing ...

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Problems solved by technology

[0005] There are two disadvantages in this authority management scheme. On the one hand, there is the situation of authority overriding. For example, the person holding the key can switch the DCS to any working mode through the key switch, but in fact the system maintenance engineer does not have the configuration The configuration engineer does not have the authority to maintain the system. If the staff mistakenly switches the DCS to an operation mode that does not conform to their own authority, it will bring potential security risks to the nuclear safety DCS.

On the other hand, the authority management method has the phenomenon of information islands. The user databases of the engineer station and the safety display station are not interoperable. For some senior engineers who have the operation authority of the field control station, safety display station and engineer station Only by mastering multiple switch keys and multiple sets of passwords can the authorities be successfully exercised

[0006] In addition, in some non-safety level DCS, access to the data server or security audit server through the network is used for authority verification. Although this method can also achieve unified authority management, this method requires online access and cannot meet the security level. DCS system requires reliability, so it cannot be applied to safety-level DCS

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