Method and system for handling boron dilution accidents in nuclear power plants

Abstract

The invention discloses a nuclear power station boron dilution accident handling method and system. The nuclear power station boron dilution accident handling method and system are suitable for poweroperation automatic control conditions. The nuclear power station boron dilution accident handling method comprises the steps that a rod control and rod position system provides a measuring signal ofa control rod position for a reactor protection system; and the reactor protection system obtains an actual rod position value of a control rod according to the measuring signal provided by the rod control and rod position system and determines whether a dilution source isolation function needs to be started or not according to the actual rod position value to output an isolation signal to a chemical and volume control system so as to automatically isolate a dilution source when a boron dilution accident occurs under the power operation automatic control condition; and therefore, an acceptancerequirement, for example, a time requirement that no intervention within 30 minutes in the Hualong project, of longer-time no intervention of an operator is satisfied, the safety performance and automation level of a unit are obviously enhanced, safety requirements of a third generation of reactor type are satisfied, and technical index requirements of the third generation of reactor type are satisfied.

Description

technical field [0001] The invention relates to the field of nuclear power, in particular to a method and system for treating boron dilution accidents in nuclear power plants. Background technique [0002] A reactor boron dilution accident is the accidental introduction of boric acid solution or demineralized water with a lower boron concentration into the primary circuit, resulting in an uncontrolled increase in reactivity, which will pose a huge threat to the safety of the reactor. According to the speed of reactivity introduction, boron dilution accidents can be divided into two types: uniform boron dilution and non-uniform boron dilution. For uniform dilution accidents during power operation, different reactor types have different treatment plans, and the acceptance criteria of different reactor types are also significantly different. [0003] For example, due to its own design characteristics, the AP1000 reactor type has inherent slowness in the process of boron misdil...

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Problems solved by technology

Although this acceptance criterion can be met for other working conditions except power running (automatic control), it still cannot meet this acceptance criterion for power running (automatic control) working conditions

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