Over-temperature overpower protection system of reactor

Abstract

The invention discloses an over-temperature overpower protection system of a reactor. The system comprises an over-temperature protection channel and a overpower protection channel. The over-temperature protection channel comprises an average temperature calculating module for calculating a circuit average temperature according to a circuit cold section temperature and a circuit hot section temperature, and an average temperature threshold module for obtaining a threshold comparison result by carrying out threshold comparison on the circuit average temperature. The overpower protection channelcomprises a overpower setting calculation module for calculating an overpower setting value according to reactor axial power deviations, the circuit cold section temperature, the circuit hot sectiontemperature and the rotating speed of a main pump, and a overpower threshold module for obtaining a threshold comparison result by carrying out threshold comparison on the overpower setting values. The output end of the average temperature calculating module is provided with a first magnetic ring, and the input end of the overpower threshold module is provided with a second magnetic ring. With thearrangement of the magnetic rings, the interference of the over-temperature protection channel and the overwork protection channel can be effectively reduced, so that the safety of the reactor is improved, and the safe and stable operation of a nuclear power plant is ensured.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to an over-temperature and over-power protection system for a reactor. Background technique [0002] The existing control system is not only complicated, but also has many devices and many input / output (I / O) ports. In particular, the external connecting cables are many and long. This is similar to an efficient antenna for picking up interference, which provides sufficient support for interference coupling. conditions, making it easy for various disturbances to invade the control system. Much EMI enters the system through external cables and ports. When the interference power is large enough to cause disturbance in reception and cause a circuit to malfunction, this forms an interference. Interference is an electronic signal that cannot be eliminated, but can only be reduced in magnitude until it no longer causes interference. [0003] The over-temperature and over-power (ove...

AI Technical Summary

Problems solved by technology

[0003] The over-temperature and over-power (over-power) channels of SIP protection cabinets in nuclear power plants, due to the complexity of the channels, include the main pump speed, voltage regulator pressure, RPN (nuclear instrumentation system) axial power deviation, primary circuit cold end hot end temperature and other signals to participate in the protection calculation. At the same time, the channel includes a differential module, which means that the design of the over-temperature and over-power channel is complex, there are many boards, and there are many lines (especially cables across the cabinet), which are susceptible to interference; the over-temperature protection channel has a lead-lag link in the channel design. Amplified, so more susceptible to external interference

The channel is easily disturbed, and it is prone to the fluctuation of the over-temperature and over-power setting value caused by the action of the cabinet door switch and the limit switch, the stack jump event, and the over-temperature setting value fluctuation caused by the interference of the over-temperature channel cable

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