Device and method for detecting water level of pressure vessel of nuclear power plant reactor

Abstract

The invention provides a device and a method for detecting a water level of a pressure vessel of a nuclear power plant reactor. The device comprises a core cooling monitoring instrument, a core cooling state identification module and a pressure vessel water level prediction module, wherein the core cooling monitoring instrument is used for acquiring a supercooling degree signal of a cooling agent of a core outlet and a main pump state signal; the core cooling state identification module is used for receiving the supercooling degree signal and identifying a temperature interval in which the supercooling degree signal is positioned; the pressure vessel water level prediction module is used for calculating, according to the main pump state signal and the temperature interval in which the supercooling degree signal is positioned, to obtain the water level of the pressure vessel. The device and the method which are provided by the invention implement continuous monitoring on the water level of the pressure vessel by predicting the water level of the pressure vessel, and provide a means for an operator to correctly judge a deterioration degree of a pressure vessel water device; meanwhile, the invention discloses judgment on a deterioration degree of a fuel cladding temperature according to the water level of the pressure vessel, so that the defect of not directly measuring the fuel cladding temperature is overcome, and the basis is provided for the operator to correctly judge a core cooling state so as to adopt effective mitigation measures.

Description

technical field [0001] The invention relates to the technical field of nuclear safety, in particular to a method and a device for predicting the water level of a pressure vessel according to the subcooling degree of the core outlet coolant for a pressurized water reactor nuclear power plant. Background technique [0002] Pressurized water reactor nuclear power plants generally use the water level instrument of the pressurizer to detect the water content of the primary circuit. In practical applications, if the coolant in the pressure vessel is two-phase vapor-liquid, the water level of the pressurizer cannot truly reflect the actual water level of the primary circuit. Wrong water loading information may cause the operator to misdiagnose the cooling state of the core, which will affect the accident handling process and make the accident worsen. [0003] At present, the water level monitoring instruments of pressure vessels are mainly divided into the following types according...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of inaccurate judgment of the degree of deterioration of the water content of the pressure vessel and the inability to directly measure the temperature of the fuel cladding when the water level measurement system of the pressure vessel fails due to a breach in the exhaust pipe or other reasons, the invention provides a method for detecting nuclear power plants. Apparatus and method for reactor pressure vessel water level

Images