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A method for preventing steam generator from overflowing under the condition of heat transfer tube rupture accident

A steam generator and heat transfer tube rupture technology, applied in nuclear engineering, nuclear power generation, nuclear reactor monitoring, etc., can solve the problems of increased release and overflow of radioactive substances, and achieve the effect of reducing the release amount

Active Publication Date: 2017-06-20
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the results of accident simulation analysis show that, using this accident mitigation method, the damaged SGs are all overflowed, resulting in the adverse consequences of increasing the release of radioactive substances to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The present invention is further described below in conjunction with embodiment.

[0019] The invention discloses a method for preventing a steam generator from overflowing under the condition of a heat transfer tube rupture accident, comprising the following steps:

[0020] Step 1. Actions before operator intervention

[0021] After a steam generator heat transfer tube rupture accident occurs in a nuclear power plant, according to the different power levels of the nuclear power plant, the emergency shutdown is triggered by the low pressure signal of the pressurizer or the coincidence signal of the high water level of the steam generator and the low water level of the pressurizer;

[0022] The safety injection is triggered by the low-low signal of the regulator pressure to make up for the loss of coolant;

[0023] The signals of the high water level of the steam generator and the low water level of the pressurizer trigger the isolation of the auxiliary feed water of th...

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PUM

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Abstract

The invention relates to a method for preventing a steam generator from spilling over under a heat-transfer tube rupture accident condition, which comprises the following steps: step one, triggering emergency shut-down after a steam generator heat-transfer tube rupture accident in a nuclear power station; step two, determining whether a heat-transfer tube rupture accident occurs, determining the damaged steam generator, and isolating steam pipelines of a loop where the damaged steam generator is located; step three, manually adjusting the water level of the damaged steam generator to a high water level of the steam generator by using a discharging system on a sewage discharging pipeline of the steam generator by an operator, and controlling an atmosphere discharging system of a loop without any heat-transfer tube rupture accident to perform temperature reduction and pressure reduction of a loop, so as to balance the pressure at a primary side and a secondary side of the damaged steam generator. The method of the invention realizes prevention of a damaged steam generator (SG) from spilling over at the secondary side under a steam generator tube rupture (SGTR) accident condition, and greatly reduces the release amount of radioactive substances to the environment.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant accident mitigation, in particular to a method for preventing overflow of a steam generator under the condition of a heat transfer tube rupture accident. Background technique [0002] A steam generator (SG) heat transfer tube rupture accident (SGTR) may occur during the operation of a nuclear power plant. This accident will cause the main circuit coolant to flow into the secondary side of the SG through the breach, which will cause the water level of the secondary side of the damaged SG to rise, and eventually cause the secondary side of the damaged SG to be full of water. If the secondary side of the damaged SG is full of water, the radioactive water will be directly discharged into the environment from the atmospheric discharge system of the secondary circuit, thus causing pollution to the environment. [0003] When an SGTR accident occurs in an active nuclear power plant, the react...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C17/017
CPCG21C17/017Y02E30/30
Inventor 丁书华高颖贤党高健钱立波吴丹李仲春张晓华吴清黄代顺张渝冷贵君刘昌文
Owner NUCLEAR POWER INSTITUTE OF CHINA