Emergency reactor-shutdown system and method for sub-critical reactor system

Abstract

The invention provides an emergency reactor-shutdown system and method suitable for accelerator driving for a sub-critical reactor system. The emergency reactor-shutdown system includes a first emergency reactor-shutdown subsystem used for controlling a reactor-shutdown circuit breaker to cut off a path between an accelerator proton source and an accelerator power source system according to an emergency reactor-shutdown signal emitted by a reactor protection system, and a second emergency reactor-shutdown subsystem used for controlling an accelerator chopper to set an accelerator proton beam current pulse duty ratio to a minimum value according to a transient signal which cannot realize emergency reactor shutdown emitted by the reactor protection system. The system and method provided by the invention can realize the emergency reactor shutdown by adopting the second emergency reactor-shutdown subsystem in the case that the first emergency reactor-shutdown subsystem fails to realize theemergency reactor shutdown, thereby greatly improving safety of a reactor.

Description

technical field [0001] The invention relates to the technical field of reactor protection, in particular to an emergency shutdown system and method for an accelerator-driven subcritical reactor system. Background technique [0002] Under the accident conditions of nuclear power plants, the realization of emergency shutdown is an important prerequisite for protecting the safety of the reactor. For existing mature pressurized water reactors, the main way to achieve emergency shutdown is to insert control rods composed of neutron poisons into the core Bring the reactor into a subcritical state. The process of relying on control rods to realize emergency shutdown is: once an accident endangers the safe operation of the reactor occurs in a nuclear power plant, the reactor protection system sends an emergency shutdown drive signal to trigger the reactor circuit breaker to trip. After the circuit breaker is opened, the power supply of the control rod drive mechanism was cut off, u...

AI Technical Summary

Problems solved by technology

With this method, when a large amount of concentrated boron water is injected into the core, the reactor cannot be restarted immediately, and the core boron concentration must be diluted before the reactor can be started, and many supporting systems are required

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