Passive shutdown device and control method thereof

Abstract

The invention discloses a passive shutdown device and a control method thereof. The device comprises a control rod, an ejection device, a stabilizer, a restraining device, a driving device, a logic circuit and a guide device. One end of the control rod is provided with the stabilizer, and the other end is provided with the guide device. The ejection device is arranged below the stabilizer, one end of the restraining device is connected with the stabilizer, and the other end of the restraining device penetrates through the ejection device to be connected with a controller. The material of the control rod is B4C, and the control rod is located in a lead-based fast reactor coolant environment. The stabilizer is a counterweight device containing ferromagnetic metal, and an electromagnetic device is arranged at the bottom of the ejection device. According to the invention, the reactor shutdown device which carries out passive reactor shutdown by virtue of buoyancy and has an automatic recovery function is designed by utilizing the large density characteristic of a lead-based fast reactor coolant. The passive shutdown device has the main characteristics that the passive shutdown device can complete an emergency shutdown function under the condition that a control rod driving mechanism is powered off and can be recovered after a power supply is recovered.

Description

Technical field [0001] The present invention belongs to the field of mechanical control, and is specifically involved in a non-movable stopping device and a control method thereof. Background technique [0002] The nuclear reactor is also known as the atomic reactor or reactor, which is a device that maintains a controllable self-sustainable nuclear fission react to achieve nuclear energy utilization. The nuclear reactor can make a self-sustain chain nuclear fission process in the conditions without the need to supplement the neutral source. During the operation of the nuclear reactor, the reactor power can be adjusted to adjust the reactor power by means of a strong neutron absorber and a control rod during the operation of the nuclear reactor. [0003] Controlling the material material is usually b 4 C made, depending on the use of the control rod, can be divided into three categories: compensation rod, adjustment rod, and safety bars. The safety rod is a device for quick-on-fl...

AI Technical Summary

Problems solved by technology

However, for lead-based fast reactors, the coolant is liquid lead or lead-bismuth, which is much denser than the control rods. Under the action of the huge density difference, it is difficult for the control rods to be inserted into the core by gravity.

Adding counterweights to the control rods can ensure that the control rods are inserted into the core by gravity, but it brings new troubles: first, heavy metals are expensive, and the cost of adding counterweights to the control rods is high; secondly, Control rods need to be configured with a density much greater than 10275kg / m 3 In order to realize the function of dropping the rods well, it takes a lot of energy to hang the control rods when the emergency shutdown is not triggered; finally, the viscous resistance of liquid metal is greater than that of water, and the control rods can be inserted into the core by their own gravity. But it is easy to cause posture imbalance or even get stuck in the reactor

Therefore, it is difficult to complete the passive shutdown task by using the traditional rod drop method

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