Safety injection tank

Abstract

The invention discloses a safety injection tank which comprises a tank body for storing boronwater and gas, and further comprises a floating body, a connecting rod and a switch, wherein the tank body is provided with a safety injection pipe communicated with a pressure vessel in a reactor; the switch is arranged in the tank body and connected with the safety injection pipe; the middle of the connecting rod is pivotally connected into the tank body; the floating body is arranged at one end of the connecting rod, and drives the other end of the connecting rod to switch on / off the switch under the action of the rising and falling of the liquid level of the boronwater; when the switch is switched off; the switch is lower than the liquid level. The safety injection tank has the advantage that the capability for relieving a large break loss of coolant accident of a primary circuit in a pressurized water reactor nuclear power plant can be effectively enhanced, so as to improve the safety of the nuclear power plant.

Description

technical field [0001] The invention relates to a nuclear reactor safety device, in particular to a safety injection box for automatically filling the core with boron-containing water when a safety accident occurs in the reactor. Background technique [0002] In the primary circuit of the PWR, the cooling water takes the heat energy released by the nuclear fuel out of the reactor pressure vessel and enters the steam generator. Through thousands of heat transfer tubes, the heat is transferred to the secondary circuit water outside the tubes, making the water Boiling produces steam; after the cooling water flows through the steam generator, it is sent into the reactor pressure vessel by the main pump, so that it circulates back and forth, continuously taking out the heat in the reactor pressure vessel and converting it into steam. [0003] The safety injection tank is a water tank connected to the primary circuit, filled with boron-containing water with a certain concentration...

AI Technical Summary

Problems solved by technology

[0004] However, according to the current design of the safety injection box, in the event of loss of water from a large breach in the primary circuit, with the discharge of the safety injection box, a large amount of high-pressure nitrogen will inevitably enter the primary circuit system in the later stage of boron-containing water discharge inside, presenting an additional risk to the effective cooling of the core

Therefore, the existing safety injection tank does not have a high mitigation ability for primary circuit loss of water accidents, and cannot effectively improve the safety of nuclear power plants

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