Availability evaluation method and apparatus for nuclear safety level DCS system

Abstract

The invention belongs to the technical field of nuclear power control. In order to solve the technical problem that the existing Markov theory calculation method is applied to the usability evaluationof the nuclear safety level DCS system, and the calculation process is too complicated, the invention provides a usability evaluation method and a device of the nuclear safety level DCS system. The method comprises the following steps of: analyzing the redundancy structure and functional logic of the nuclear safety level DCS system, and establishing a fault tree from top to bottom; Wherein, whenthe corresponding subsystem of the nuclear safety level DCS system in the fault tree comprises a board card, the lowest layer of each functional unit in the subsystem in the fault tree is the board card; The utility model obtains the failure rate parameters and the average failure maintenance time of each board in the fault tree, obtains the availability parameters of the functional units, and analyzes the availability of the nuclear safety level DCS system in combination with the availability, redundancy structure and functional logic of each functional unit in the fault tree.

Description

technical field [0001] The invention relates to the technical field of nuclear power safety control, in particular to an availability evaluation method and device for a nuclear safety level DCS system. Background technique [0002] Compared with thermal power, nuclear power has achieved good development due to its advantages in environmental protection and large power generation. However, the Fukushima nuclear power plant accident in Japan in 2011 made the safety of nuclear power plants a matter of great concern. Therefore, the nuclear power plant instrument and control system Various considerations have been added to safety factors in the design process. The nuclear safety level digital control system (Digital Control System, referred to as DCS) is the core control system of the nuclear power plant, and the availability of the nuclear safety level DCS system is used to evaluate the indicators of the nuclear safety level DCS system failure and maintenance process; therefore,...

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Problems solved by technology

[0011] In order to solve the technical problems of the Markov theory calculation method applied in the availability assessment of the nuclear safety DCS system in the prior art, the existing calculation process is too complicated, etc., the present invention provides a method and device for the availability assessment of the nuclear safety DCS system , by using the fault tree for usability evaluation, the modeling method is more intuitive and easy to review, the calculation method is relatively simple and easy to converge, and is suitable for engineering applications

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