Measurement method of core water level in nuclear power plant

Abstract

The invention discloses a nuclear power plant reactor core water level measurement method. The method is used for measuring reactor core water levels under different working conditions. The method comprises executing the following processes according to five types of typical main pump / main pump composition: S1, running the current main pump / main pump composition, and measuring reactor core total head, a reactor core outlet temperature and primary loop absolute pressure of the current main pump / main pump composition under the condition of cold shutdown and / or hot shutdown, S2, based on the reactor core outlet temperature and the primary loop absolute pressure, calculating the average density of a reactor core coolant, and according to the average density, calculating static pressure head of the reactor core, S3, according to the total pressure head and static pressure head, calculating a dynamic head of the reactor core, and calculating a dynamic head compensation coefficient based on the dynamic head, and S4, according to the total pressure head, the average density and the dynamic head compensation coefficient, calculating a water level of the current main pump / main pump composition under the condition of cold shutdown and / or hot shutdown. The method considers all possible cases of the main pump or main pump composition in operation, directly calculates the portion of the liquid phase level, and ensures the accuracy of the measurement and calculation under various working conditions.

Description

technical field [0001] The invention relates to the field of nuclear power, in particular to a method for measuring the core water level of a nuclear power plant. Background technique [0002] The Three Mile Island nuclear accident in the United States in 1979 exposed the limitations of the EOP (Event Oriented Procedure) accident procedure. In this regard, EDF (Electricité de France) began to study SOA (State Oriented Method) in 1980. After years of research and development, the SOP (State Oriented Procedure) accident procedure based on SOA has been gradually improved, and the Daya Bay Nuclear Power Plant will switch to the SOP accident procedure in 2015. For this reason, the core temperature and water level monitoring system of the Daya Bay Nuclear Power Plant has been in accordance with the SOP The algorithm requirements of the system have undergone overall transformation, and a large number of newly-built CPR1000 nuclear power units in China have used SOP accident procedu...

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Problems solved by technology

[0003] After switching to the SOP accident procedure, the core water level will become one of the most important parameters in the implementation of the SOP accident procedure in the accident state. However, there is no mature method for regular calibration of the core water level in China, which cannot meet the requirements of the SOP regulation on the state of the core water level. measurement requirements

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