Mixed retarder for high-temperature gas-cooled reactor accidental scramming

Abstract

The invention relates to the technical field of reactor engineering, and especially discloses a mixed retarder for high-temperature gas-cooled reactor accidental scramming. The retarder comprises: a connecting piece, an upper end cap and a lower end cap respectively arranged on the two ends of the connecting piece, a transmission shaft positioned inside the connecting piece and arranged between the upper end cap and the lower end cap, and permanent magnetic damping pieces and electromagnetic pieces. The retarder is detachably connected to external equipment. According to the mixed retarder for high-temperature gas-cooled reactor accidental scramming, the permanent magnetic damping pieces and the electromagnetic pieces are reasonably combined. Therefore, reliability of the retarder is greatly improved, scramming speed in a control rod accident can be effectively controlled, and technical problems of high-temperature resistance and radiation resistance are solved.

Description

technical field [0001] The invention relates to the technical field of reactor engineering, in particular to a high-temperature gas-cooled reactor accident-drop hybrid retarder. Background technique [0002] The working environment conditions (such as high temperature, helium environment, radioactivity) of the high temperature gas-cooled reactor accident rod drop retarder are relatively harsh, the installation space is small, and the safety failure criterion needs to be met. Under the normal working conditions of the reactor, damping is required to be as small as possible or no damping is required to reduce the demand for power equipment; when the control rod drive mechanism is de-energized, a larger damping is required to reduce the falling speed of the control rods and reduce Impact on the control rod drive mechanism. [0003] At present, the retarders used in the control rod drive mechanism of the high temperature gas-cooled experimental reactor are all permanent magnet ...

AI Technical Summary

Problems solved by technology

[0008] (1) The control rods of commercial high-temperature gas-cooled reactors are heavy and have a long stroke. The weight and stroke of the control rods are generally more than four times that of the experimental reactor, and the simple permanent magnetic damping is difficult to meet the requirements;

[0009] (2) The performance of the permanent magnet varies greatly with the temperature, which may easily cause the rod drop time to be too long at low temperature or the rod drop speed to be too fast at high temperature, thus failing to meet the operating requirements of the control rod system

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