Pressurizer water level measurement method based on digitalization technology

Abstract

The invention belongs to a nuclear power plant reactor coolant system process measurement method, and particularly relates to a pressurizer water level measurement method based on a digitalization technology. The pressurizer water level measurement method comprises: (1) setting an instrumentation system; (2) acquiring basic parameters; (3) acquiring basic measurement data; (4) calculating density; and (5) calculating the water level. The pressurizer water level measurement method has the following advantages that: after the digitalization is adopted, the pressurizer water, the steam, the water density of the reference pipe, and the thermal expansion of the pressurizer body under different measurement operating conditions can be real-timely calculated, and it is ensured that the actual water level can be directly measured under any operating conditions with the measurement system so as to increase the measurement precision and reduce the burden on operators.

Description

technical field [0001] The invention belongs to a method for measuring the process of a reactor coolant system in a nuclear power plant, in particular to a method for measuring the water level of a pressurizer based on digital technology. Background technique [0002] In a pressurized water reactor nuclear power plant, the water level of the pressurizer represents the water content of the reactor coolant system and is an important protection parameter. When the water level of the pressurizer is too high, it will directly trigger shutdown protection. In addition, the water level control system of the pressurizer is also one of the five major control systems of the reactor. Therefore, it is very necessary to measure the water level of the pressurizer as accurately as possible for the safe and economical operation of the power plant. [0003] The water level measurement of the voltage stabilizer usually adopts the differential pressure method, that is, the differential pressure...

AI Technical Summary

Problems solved by technology

[0011] Because traditional nuclear power plants are designed with analog technology, it is difficult to complete such complex density and thermal expansion calculations, so only one standard working condition design can be selected. Calibration of power operating conditions, convert the differential pressure measured by the differential pressure transmitter into the water level under the standard working condition, and then calculate the corresponding relationship offline according to the difference between other working conditions and the standard working condition. Manually calculate the actual water level based on these off-line calculated correspondence curves

However, the actual working conditions are very complicated, and it is impossible to calculate all working conditions offline. Only some typical working conditions can be calculated, which is very inconvenient to use.

Images