Overpressure protection system and method of cold functional test in nuclear power plant

Abstract

Embodiments of the invention disclose an overpressure protection system and method of a cold functional test in a nuclear power plant. The system comprises a pressure transmitter, an actuating mechanism and a DCS system. The pressure transmitter is used for detecting a pressure value of a circuit and sending a detection signal to the DCS system. The DCS system is used for generating an output signal according to the detection signal and sending the output signal to the actuating mechanism. The actuating mechanism is used for actuating overpressure protective action according to the output signal. The overpressure protection system of the cold functional test in the nuclear power plant is established by the innate DCS system of the nuclear power plant, the acquisition of the special and expensive simulation device for performing the cold functional test is avoided, the cost is reduced effectively, and the temporary device resource of the engineering is saved. Moreover, the wiring of the devices such as the DCS system, the actuating mechanism and the pressure transmitter mainly uses the existing formal cable of the nuclear power plant, so that the quantity of the temporary cable is reduced greatly, and the wire-connecting and wire-disconnecting times are reduced.

Description

technical field [0001] The invention relates to the field of nuclear power, in particular to an overpressure protection system and method for cold-state functional tests of nuclear power plants. Background technique [0002] The cold-state functional test of nuclear power plants, also known as the primary circuit hydraulic test, is a hydraulic test for the pressure-bearing boundary of the primary circuit system composed of pressure vessels and connected pipelines. During the test, pressurize the primary circuit to the target pressure value (for example, it is 1.25 times the design pressure of the primary circuit in the first primary circuit hydraulic test, and 1.2 times the design pressure of the primary circuit in the periodic retest) to verify the primary circuit system Whether the pressure bearing capacity under normal operation and accident conditions meets the design requirements. During the test, first increase the pressure gradually, and stay on the pressure platform...

AI Technical Summary

Problems solved by technology

The existing overvoltage protection system is built by expensive special simulation equipment, a small number of temporary devices such as relays and temporary cables

For each cold-state functional test, an overpressure protection system needs to be temporarily built and dismantled after the test is completed, thus occupying more temporary equipment resources

In addition, the dedicated simulation equipment is powered by a temporary power supply, which easily brings the risk of power failure. The overvoltage protection screen of the simulation equipment cannot reflect the real-time status of the field equipment, and the power station computer information and control system (KIC) screen does not have operable functions.

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