Gas humidity monitoring device for nuclear reactors

Abstract

The invention discloses a gas humidity monitoring device for nuclear reactors. The device includes: a cooling control unit for cooling a high-temperature primary loop sampling gas to a certain temperature range; a sampling unit for sampling the cooled gas; and a humidity detection unit for detecting the humidity of gas in the sampling unit. The humidity detection unit includes a humidity sensing component, and a signal conversion circuit which converts an output signal from the humidity sensing component into a signal that can be recognized by a reactor protection system. Collection and conversion of the humidity signals are achieved by a pure-hardware structure, so that reliability demand of security-class equipment is satisfied. The device has high responding speed and achieves zero-emission of radioactive gas.

Description

technical field [0001] The invention relates to the field of humidity monitoring devices, in particular to a gas humidity monitoring device for nuclear reactors. Background technique [0002] The nuclear reactor gas humidity monitoring device is a special equipment for high-temperature gas-cooled reactor nuclear power reactors. The equipment measures the primary circuit gas humidity in real time, and converts the measurement results into signals that can be recognized by the reactor protection system and sends them to the reactor protection system. When a steam generator pipe break accident causes water to enter the primary circuit system, the humidity of the primary circuit gas will increase, and the humidity monitoring device can respond to the humidity change within 10s and trigger the protection action in time. [0003] The high-temperature gas-cooled reactor using helium as the primary coolant belongs to the fourth-generation nuclear reactor. China is at the internation...

AI Technical Summary

Problems solved by technology

The existing industrial system humidity online measurement system cannot be directly used in high-temperature gas-cooled reactor nuclear power, and there are two major mismatches:

[0005] 1. The measurement and processing of existing humidity measuring devices are based on software, but the software does not have V&V certification, which does not meet the requirements of V&V certification for safety-level equipment software of nuclear power plants

[0006] 2. The existing measurement method is pressure-reduction measurement, and the gas after measurement cannot be returned to the main pipeline, and the requirement of zero discharge of radioactive gas in the primary circuit cannot be achieved.

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