Software common mode fault detection system and its control method for safety level dcs of nuclear power plant

Abstract

The invention discloses a software common mode failure detection system of a nuclear power station security level DCS. The software common mode failure detection system comprises a software control system sending a software control signal and a hardware control system sending a hardware control signal, wherein the software control system and the hardware control system are respectively in selection card connection with a receiving signal in anoptimization selection card mode. The optimization selection card is connected with a controlled device. The software control system and the hardware control system are further respectively connected with a common mode failure detection module which detects whether the software control system is correct or not. The common mode failure detection module is connected with the optimization selection card. According to the software common mode failure detection system of the nuclear power station security level DCS and the control method of the common mode failure detection software system of the nuclear power station security level DCS, correctness of the software control system is firstly judged, then with the basis, correctness of the hardware control system is judged, and correct output of the optimization selection card is guaranteed. The common mode failure detection module can detect the software control system in a real-time mode, and therefore the failure of the software control signal and the failure of the hardware control signal can be found out in a real-time mode, and changing-over can be carried out timely.

Description

technical field

[0001] The invention relates to the field of nuclear power plants, in particular to a system and a control method for detecting common-mode faults of software control when software and hardware controls coexist in a safety-level DCS control system of a nuclear power plant. Background technique

[0002] Due to the requirement of a single fault in the safety-level DCS software of nuclear power plants, it is necessary to detect and take measures in time to ensure that the safety-level DCS system of nuclear power plants will not be affected when a common-mode fault occurs in the software. Signals are processed instead of software. According to the requirements of diversity and single failure of the safety-level DCS instrument and control system of nuclear power plants, while designing the computer-based DCS control system, it is necessary to design a hardware control system. The purpose of the design is to ensure that the software control system fails. , the har...

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