Design method for reducing maloperation rate of reactor protection system

Abstract

The invention discloses a design method for reducing the misoperation rate of a reactor protection system. The method comprises the following steps: an acquisition and operation unit in a third protection channel firstly screens received signals, and then the screened signals are quantitatively compared; acquisition and operation units in a first protection channel and a second protection channelrespectively quantitatively compare the received signals; and the signals quantitatively compared by the three acquisition and operation units undergo two-out-of-three logic operation processing, andthe generated final protection action signal is input into the reactor protection system. The method avoids the maloperations of the protection system, caused by failure or maintenance of a DCS modulein one channel of a one-out-of-two voting logic function in the running period of a nuclear power plant, reduces the spurious shutdown / wrong special driving risks of the nuclear power plant, and is beneficial for improving the economical and safe property of the nuclear power plant.

Description

technical field [0001] The invention relates to the design field of the reactor protection system of a nuclear power plant, in particular to a design method for reducing the malfunction rate of the reactor protection system. Background technique [0002] The reactor protection system is a very important part of the nuclear power plant, and plays a vital role in the safe, economical and reliable operation of the nuclear power plant. Reactor protection system involves two performance indicators: rejection rate and malfunction rate. The rejection rate refers to the probability that the system cannot act due to random faults when the system is required to generate protection actions; the false action rate refers to the number of false actions of the system or components within a unit time. [0003] For a nuclear power plant reactor protection system structure that is generally designed with three protection channels and the logic vote is "two out of three", when some of the rea...

AI Technical Summary

Problems solved by technology

Therefore, when actually implementing the above-mentioned "two out of one" reactor protection system function, there is a risk that the digital instrumentation and control system (DCS) module of any protection channel in the two protection channels will accidentally trigger the protection action due to failure or maintenance, thereby reducing the risk of nuclear reactor protection. The economy of the operation of the power plant, some malfunctions may also have adverse effects on the safe operation of the nuclear power plant

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