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A full-pressure passive gravity injection system for a nuclear power plant

An injection system, passive technology, applied in the direction of power plant safety devices, nuclear power generation, nuclear power plant auxiliary equipment, etc., can solve problems affecting the economics of power plants, large breach accidents, and increasing the volume of containment

Active Publication Date: 2021-05-28
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Gravity injection under depressurization conditions brings many problems. For example, if a large-volume safety injection tank is arranged in the containment vessel, the volume of the containment vessel must be increased; active depressurization after a transient accident destroys the integrity of the pressure boundary of the primary circuit. Artificially developing a non-serious transient accident into a more serious primary circuit large breach accident; the radioactive coolant of the primary circuit is discharged into the containment, and the long-term containment cleaning after the accident affects the economics of the power plant and even affects the operation of the power plant life

Method used

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  • A full-pressure passive gravity injection system for a nuclear power plant
  • A full-pressure passive gravity injection system for a nuclear power plant

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Embodiment 1

[0035] like figure 1 As shown, this embodiment provides a specific implementation of the full-pressure passive gravity injection system of a nuclear power plant. The equipment includes a transfer water tank 4, a water storage tank 7, a dispersion filter 6, and 4 main pipelines: the first pressure equalization pipeline 2. Injection pipeline 3, second pressure equalization pipeline 9, water supply pipeline 5. The cut-off valve 8 is set to cooperate with the operation of the injection system, and the following symbols mentioned in the figure are all cut-off valves 8: A, B, C, D, E, F, G, H, I, J. Wherein D also serves as the relief valve 11.

[0036] In this embodiment, compared with the traditional pressurized water reactor, the volume of the transfer water tank 4 is similar to the volume of the medium pressure safety injection tank, about 50 cubic meters. The boron-containing water tanks of some power plants have the function of refueling. The submerged reactor chamber is shi...

Embodiment 2

[0050] The present embodiment is further limited on the basis of embodiment 1, as figure 2 As shown, the function of the boron-containing water tank as a large-volume water source is different from that of figure 1 similar to figure 1 Increase the isolated water tank on the basis of , correspondingly, add the balance pipeline and the water supply pipeline 5, add the shut-off valve M, N, O, P, and add two valves inside the isolated water tank: K, condensate discharge valve; L, pressurized discharge valve. The isolated water tank is a pressure-bearing device, and its pressure-bearing capacity is the same as that of the primary circuit. It is not connected to the ventilation device, and its volume can be relatively small, such as 100 cubic meters. The isolated water tank is arranged between the transfer water tank 4 and the boron-containing water tank as a pressure-bearing device to isolate the two. The isolated water tank is higher than the transfer water tank 4 and lower than...

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Abstract

The invention discloses a full-pressure passive gravity injection system of a nuclear power plant, which is used for passive gravity water injection to the primary circuit of the reactor. The water injection system includes a transfer water tank and a water storage tank. Between, the transfer water tank and the water storage tank are provided with communication pipes, and the communication pipes are provided with shut-off valves; in the height direction, the position of the reactor is lower than the position of the transfer water tank, the transfer The position of the water tank is lower than the position of the water storage tank. With this injection system, the primary circuit of the power plant does not need to be depressurized after the accident, and the primary circuit does not need to implement active discharge for the purpose of low-pressure injection, and does not rely on an external power source, and the external water source is gravity injected into the primary circuit in a passive manner.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor safety facilities, in particular to a full-pressure passive gravity injection system of a nuclear power plant. Background technique [0002] The primary circuit of the nuclear power plant reactor is in a state of high temperature and high pressure during normal operation. After an accident, it is necessary to inject water into the reactor coolant system (referred to as the primary circuit). After a power outage (SBO) accident, such as the Fukushima accident, active equipment involving power resources such as power sources cannot operate, and safety injection pumps cannot be operated to inject water into the reactor. Passive special safety facilities must be considered. [0003] A passive safety gravity injection design concept is predicated on dredging and pressure relief. For example, the AP1000 advanced pressurized water reactor is equipped with a large-displacement primary circuit press...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21D1/02G21D3/04G21C15/18
CPCG21C15/18G21D1/02G21D3/04Y02E30/00Y02E30/30
Inventor 孔翔程邓纯锐明哲东张渝余红星
Owner NUCLEAR POWER INSTITUTE OF CHINA
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