Instrument availability analysis method for severe accidents of nuclear power plant

Abstract

The invention belongs to design technology for nuclear power plants, and particularly relates to an instrument availability analysis method for severe accidents of a nuclear power plant. According to the method, first, a list of equipment and instruments needed for severe accident management is determined, and then environmental conditions in which the equipment and the monitoring instruments can be in the severe accidents are determined, according to elements of the instrument analysis, the environmental conditions in the severe accidents are combined, and an analysis method base on envelope values of the environmental conditions or an analysis method based on the time window and environmental condition curves is selected to carry out the availability analysis. The conclusion of the analysis can be used for guiding the assessment of weak links in the severe accidents in an operational nuclear power plant, seeking reasonable and practical improvement measures, enhancing the management of the severe accidents and further improving the general safety level of the operational nuclear power plant.

Description

technical field [0001] The invention belongs to the design technology of nuclear power plants, and in particular relates to an analysis method for instrument availability under serious accidents of nuclear power plants. Background technique [0002] my country's nuclear safety regulations have clear requirements for the state monitoring of nuclear power plants under severe accident conditions. In HAF102 "Nuclear Power Plant Design Safety Regulations", in terms of instrumentation, control and control room design, Section 6.4.1.2 requires that "Instrumentation and recording devices must be sufficient to determine the state of the nuclear power plant during a severe accident and for decision-making during accident management. as much information as practicable". [0003] In order to meet the requirements of nuclear safety regulations and improve the level of nuclear safety, considering the availability of instruments under severe accidents is necessary to ensure that operators...

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Problems solved by technology

[0005] However, in the design stage of nuclear power plants, the research on severe accidents in the world is still in its infancy, and the original design of the power plant is only preliminary and incomplete in the design of severe accident countermeasures.

[0006] With the in-depth understanding of instrument availability analysis under severe accidents in nuclear power plants, although the instrument availability analysis under the existing conditions has been carried out, the comparison between the instrument qualification conditions and the envelope values ​​of severe accident environmental conditions is only carried out, and Insufficient analysis of whether the phases that require instrumentation to be operational and perform functions after a severe accident are clearly available

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