System and method for judging validity of compressed air flow data in nuclear power plant system

Abstract

The invention provides a nuclear power plant system compressed air flow data validity judgment system and method. The system comprises a sampling module which is used for collecting multiple compressed air flow data sets at multiple preset time points, wherein one corresponding compressed air flow data set is collected at one preset time point, and each compressed air flow data set includes the preset number of compressed air flow data; a processing module which is used for obtaining the threshold value according to the preset number of compressed air flow data and judging the validity of thecorresponding compressed air flow data set according to the comparison result of each compressed air flow data and the threshold value and sending out an invalidity judgment signal when the processingmodule continuously judges that the two compressed air flow data sets corresponding to the two adjacent preset time points are invalid; and a control module which is used for controlling the nuclearpower plant system to stop operation when receiving the invalidity judgment signal so that the influence of data fluctuation caused by the change of the normal process state can be avoided, the sensorfault condition can be truly reflected and the misjudgment rate can be reduced.

Description

technical field [0001] The invention relates to the technical field of nuclear safety, in particular to a system and method for judging the validity of compressed air flow data in a nuclear power plant system. Background technique [0002] The containment leakage rate on-line monitoring system is used to assist in evaluating whether the leakage rate of the containment of a nuclear power plant meets the design basis requirements under accident conditions. The leakage rate is calculated by monitoring the air quality changes in the containment under normal operation of the power plant. The instrument compressed air used to control the pneumatic regulating valve in the containment is injected into the containment due to the action of the regulating valve, which interferes with the measurement of the leakage rate. When calculating the total air mass in the containment, the mass of compressed air injected into the containment must be deducted. In the current nuclear power plant de...

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Problems solved by technology

[0004] It is found in operation practice that during the start-up process of the unit, the compressed air flow fluctuates greatly within half an hour due to the frequent operation of the pneumatic control valve in the containment. The situation is misjudged as invalid, and it is believed that the system is out of service due to the failure of the instrument, which has a great impact on the availability of the monitoring system. It is necessary to optimize the method for judging the effectiveness of compressed air flow, so as to avoid the existing method that is easy to misjudge the normal operation situation as The problem of instrument failure

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