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Passive and active combined nuclear power plant safety injection system and using method thereof

A technology for safe injection, nuclear power plants

Inactive Publication Date: 2020-11-10
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] After the reactor coolant pipe breach accident condition (LOCA) occurred in the pressurized water reactor nuclear power plant, the reactor coolant was lost from the pressure vessel, which caused the reactor core fuel elements to lose coolant and burn out, further threatening the safety performance of the reactor

Method used

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  • Passive and active combined nuclear power plant safety injection system and using method thereof

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Embodiment

[0050] This embodiment proposes a nuclear power plant safety injection system combining passive and active.

[0051] The design principle of the safety injection system of the present embodiment is:

[0052] After the LOCA accident in the pressurized water reactor nuclear power plant, the reactor coolant was sprayed out from the breach. The loss of reactor coolant loading leads to a drop in the water level of the pressurizer and a drop in the pressure of the pressurizer. It is judged by the drop in the pressure of the pressurizer or the drop in the water level of the pressurizer that the core needs water replenishment measures. The first low pressure signal of the pressurizer or the pressurizer The low water level signal automatically triggers the passive high-pressure safety injection system to replenish water to the core. When the LOCA accident cannot be terminated in time and the pressure of the reactor coolant system continues to drop, the second low pressure signal of th...

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Abstract

The invention discloses a passive and active combined nuclear power plant safety injection system and a using method thereof. The passive and active combined nuclear power plant safety injection system comprises a high-pressure safety injection water tank, a medium-pressure safety injection water tank and a low-pressure safety injection system which are arranged in a containment vessel, wherein the high-pressure safety injection water tank is filled with water and is communicated with a reactor coolant system through a balance pipeline and an injection pipeline, the medium-pressure safety injection water tank is filled with a certain amount of compressed nitrogen, is higher than a reactor core, and is connected with the reactor coolant system through an injection pipeline, and the low-pressure safety injection system adopts a low-pressure safety injection pump to take water from a reactor pit reservoir and injects the water into the reactor coolant system. According to the invention, comprehensive coverage of different pressure range requirements of high pressure, medium pressure, low pressure and the like can be realized, diversity and reliability of a safety injection function are realized, simplified arrangement of a system structure is realized, and safety and economy of a nuclear power plant are improved.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant safety design, in particular to a passive and active nuclear power plant safety injection system and a use method thereof. Background technique [0002] After the reactor coolant line breach accident condition (LOCA) occurred in the pressurized water reactor nuclear power plant, the reactor coolant was lost from the pressure vessel, which caused the fuel elements of the reactor core to lose coolant and burn out, further threatening the safety performance of the reactor. Therefore, it is necessary to set up a safety injection system for the LOCA accident to deal with the loss of coolant during the LOCA accident, maintain the coolant loading of the reactor, ensure the coolability of the core fuel elements, and ensure the safety of the reactor. Contents of the invention [0003] In order to deal with the loss of coolant during the LOCA accident and ensure the safety of the reactor, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C15/18
CPCG21C15/18G21C15/182Y02E30/30
Inventor 邱志方邓坚丁书华李喆江光明党高健刘余高颖贤沈才芬方红宇李峰米争鹏初晓吴鹏蔡容
Owner NUCLEAR POWER INSTITUTE OF CHINA
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