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Method for improving integrated reliability of nuclear power station safety injection system

A reliable, pressurized water reactor nuclear power plant technology, applied in the direction of nuclear power generation, climate sustainability, nuclear engineering, etc., can solve the problems of large evaporation, frequent water replenishment, and high I0 consumption, so as to reduce the low temperature alarm value and improve power generation Efficiency, elimination of O&M effects

Inactive Publication Date: 2006-06-07
DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT
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Problems solved by technology

[0006] However, since the concentrated boron water tank needs to be operated at high temperature (otherwise it will crystallize), the evaporation is large and the water replenishment is frequent. Long-term use will lead to the increase of impurities in the safety injection system, and the crystallization and blockage of related equipment and pipelines, which will reduce the availability of the safety injection system. I0( Refers to "equipment unavailable") consumes a lot, and also brings great difficulties to normal operation and maintenance

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  • Method for improving integrated reliability of nuclear power station safety injection system

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Embodiment Construction

[0014] figure 2 It is a schematic diagram of the safety injection system and the concentrated boron water tank in the present invention. The safety injection system is one of the most important safety systems in nuclear power plants, and it is a system used to inject boron water into the reactor. The concentrated boron water tank 7 is located on the pipeline connecting the safety injection system to the primary circuit of the reactor, marked with 004BA in the figure. After the safety injection system is started, boron water with a certain concentration is first injected into the reactor to ensure the safety of the reactor in case of an accident.

[0015] The invention provides a method for solving the problems caused by the previous 21000ppm boron concentrated boron water tank. That is to say, reducing the boron concentration in the concentrated boron water tank to 7000-9000ppm can fundamentally solve the above problems. Replacing the 21000ppm boron water in the concentrat...

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Abstract

The present invention discloses a method of raising the integral reliability of safety injection system of pressurized water reactor in nuclear power station. The concentrated boron water tank is set in the connection pipeline of loop from the safety injection system to the pressurized water reactor. The method includes the following steps: mixing crystallized boron and deionized water, controlling the boron concentration inside the concentrated boron water tank in 7000-9000 ppm, and setting the low temperature warning value of the concentrated boron water tank as 35 deg.c. The present invention can eliminate pipeline jamming caused by boron crystal and raise the reliability of the safety system in pressurized water reactor nuclear power station.

Description

technical field [0001] The invention relates to a method for improving the overall reliability of the safety injection system of a pressurized water reactor nuclear power plant, especially a method for improving the overall reliability of the safety injection system by reducing the concentration of boron in a concentrated boron water tank. Background technique [0002] The pressurized water reactor nuclear power plant is a nuclear reactor power plant widely used at present. Its characteristic is that the water does not boil in the core, so the water must be kept under high pressure. figure 1 A schematic diagram of a pressurized water reactor is shown. A fuel element rod 1 (core) is provided in the pressure vessel 2 . The pressure inside the pressure shell 2 can reach more than 100 atmospheres. Water can be heated above 330°C. The water with increased temperature enters the steam generator, which has many thin tubes, and the water in the thin tubes receives heat and turns...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C9/00
CPCY02E30/30
Inventor 肖岷
Owner DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT
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