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Emergency shut-down system and method combining activeness and passiveness

A shutdown system and passive technology, applied in the field of reactor design, can solve problems such as failure to provide emergency boron injection in time, failure to realize high-concentration boric acid injection, etc., and achieve the effect of improving safety

Active Publication Date: 2013-01-16
CHINA NUCLEAR POWER ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional chemical volume control system cannot provide emergency boron injection in time, nor can it realize the injection of high-concentration boric acid. Therefore, it can only be used as a means of reactor power regulation, not as a means of emergency shutdown

Method used

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  • Emergency shut-down system and method combining activeness and passiveness

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Embodiment

[0021] like figure 1 As shown, a conventional pressurized water reactor used in a nuclear power plant includes a reactor pressure vessel and core 1, a steam generator 2, a pressurizer 3, a main pump 4, and a control rod emergency shutdown subsystem 5. In addition, the nuclear power plant is designed with a reactor The protection system is composed of relevant measuring instruments and control systems. In the event of an accident, the reactor protection system performs logic operations to issue a reactor emergency shutdown drive signal (automatic shutdown signal or manual shutdown signal), triggering the control rod drive system 5 in the reactor emergency shutdown system. The emergency shutdown driving signal de-energizes the coil of the shutdown circuit breaker 6 in the control rod emergency shutdown subsystem 5, the shutdown circuit breaker 6 is opened, the power supply of the control rods is de-energized, the control rods fall, and the reactor is shut down. In addition, if ...

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Abstract

The invention belongs to reactor design technologies and particularly relates to an emergency shut-down system and method combining activeness and passiveness. The system comprises a control rod emergency shut-down subsystem and an emergency boron injection subsystem. A shut-down breaker of the control rod emergency shut-down subsystem is connected with a reactor protection system, receives emergency shut-down signals sent by the reactor protection system and enables drop of a control rod to be achieved. The emergency boron injection subsystem comprises a concentrated boron storage tank and an injection pump positioned on an injection pipeline, the concentrated boron storage tank is connected with a reactor pressure container and a reactor core through the injection pipeline, and an injection pump control system is connected with the reactor protection system, receives failure-in-achievement emergency shut-down signals sent by the reactor protection system or reactor core neutron flux high signals, and injects concentrated boron into the reactor pressure container and the reactor core. The reliability of the emergency shut-down system under the conditions of accidents is reinforced, and safety of the reactor is improved.

Description

technical field [0001] The invention belongs to reactor design technology, and in particular relates to an active and passive emergency shutdown system and method. Background technique [0002] In the event of a nuclear power plant accident, realizing emergency shutdown is an important prerequisite for protecting the safety of the reactor. For traditional pressurized water reactor design, the main way to achieve emergency shutdown is to insert control rods composed of neutron poisons into the core to make the reactor enter subcritical state immediately. The process of realizing emergency shutdown by means of control rods is: the reactor protection system performs logic operations to generate a driving signal for emergency shutdown of the reactor. Power was lost, control rods fell, and the reactor shut down. In this emergency shutdown method, there is a potential possibility that the control rods cannot be lowered, resulting in failure of emergency shutdown of the reactor. ...

Claims

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Application Information

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IPC IPC(8): G21C7/08G21C9/02
CPCG21C9/02G21C9/033Y02E30/39G21C7/22G21C7/08G21C9/027G21D3/06Y02E30/30
Inventor 赵侠于勇黄伟峰赵斌
Owner CHINA NUCLEAR POWER ENG CO LTD
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