Protection method and system for digitalized instrument control diversity of nuclear power station

Abstract

The invention discloses a protection method for digitalized instrument control diversity of a nuclear power station. The method comprises the following steps that a diverse actuation system (DAS) is used for obtaining a common cause failure (CCF) which is formed by overlapping abnormal working status of the nuclear power station; the DAS is used for driving manual control on operation and control of a key safe function in the CCF, the key safe function comprises at least one of reaction control, waste heat elimination, a reactor coolant device, containment isolation and containment integrity; if the operation and control of the key safe function can not be subjected to the manual control according to the requirement of response time, the DAS is used for implementing automatic driving operation. According to the protection method for the digitalized instrument control diversity of the nuclear power station, occurrence of the CCF can be effectively prevented. Additionally, the invention further discloses a protection system for the digitalized instrument control diversity of the nuclear station.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and more specifically, the invention relates to a method and system for protecting digital instrumentation and control diversity of nuclear power plants. Background technique [0002] Common Cause Failure (CCF) refers to the failure of several devices or components to fail to perform their functions due to a specific event or cause. These events may come from the external environment or may be caused by defects in the design itself. With the application of digital technology in nuclear power plants, it brings advantages such as easy maintenance, strong availability and self-diagnosis, but also because of its high integration and complexity, it cannot be fully tested, especially not proven Software is bug-free, thus increasing the risk of common cause failures. Once CCF occurs, redundant systems running the same software may fail at the same time, so common cause failure is extremely danger...

AI Technical Summary

Problems solved by technology

It is expected that the Anticipated Transient Without Scram (ATWS) system provides functions such as shutting down the reactor, starting auxiliary feed water, blocking the third group of atmospheric relief valves (GCT-a) and isolating the steam generator blowdown (APG) system, etc. The coverage of the automatic shutdown means provided by ATWS for RPS common cause failure is mainly the ATWT superimposed on the second type of design basis accident (that is, the transient state where the RPS cannot normally shut down), and there is no complete coverage of the RPS common cause failure superposition All design basis accidents for

At the same time, since the ECP and BUP bypass digital technology can only set manual functions on the ECP and BUP boards, there is a relatively large risk for the accident key of design criteria III and IV accidents superimposed on RPS common cause failure, and cannot fully meet relevant regulations , Standard requirements for protection system common cause fault CCF

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