Member for forming free liquid surface of spallation target part in topspin-type liquid no-window neutron

Abstract

The invention discloses a member for forming a free liquid surface of a spallation target part in a topspin-type liquid no-window neutron, wherein the member is used in an accelerator drive subcritical system. Some members for forming the free liquid surface in the prior art employ the topspin design and generate a stable free liquid surface, but liquid metal is difficult to discharge stably at discharge segments of the members and there is heat transfer deterioration caused by the formation of a vortex stagnation region. The member comprises a discharge segment, and the discharge segment can enable the liquid metal to be discharges from the target part stably, cannot cause dripping and cannot affect the stability of the free liquid surface. The member comprises an impeller, wherein a core shaft of the impeller is provided with a through hole. The diameter of the core shaft is smaller, thereby effectively preventing the vortex stagnation region from being generated. The deflection angle of an impeller blade in the member is smaller, and the member can reduce the pressure drop of the target part along with the through hole of the core shaft. Generally speaking, the member is better in thermal transfer capability, is lower in research and development and manufacture difficulty, and more easily meets the requirements of industrial application.

Description

technical field [0001] The invention relates to a spallation neutron source and a top-spin liquid metal windowless neutron spallation target for radioactive nuclear waste treatment, more specifically, a free liquid surface forming component of the spallation target. Background technique [0002] Accelerator-driven subcritical system—ADS system can use nuclear transmutation reaction to convert long-lived, high-radioactive nuclides into short- and medium-lived, low-radioactive nuclides, and realize safe disposal of nuclear waste, which is conducive to the long-term sustainable development of nuclear energy. The ADS system includes a proton accelerator, a neutron spallation target and a subcritical core, and the neutron spallation target is the coupling part of the proton accelerator and the subcritical core, which plays a vital role in the overall performance and safety of the system . In addition, the spallation neutron source can also be independently used as a large scient...

AI Technical Summary

Problems solved by technology

In this design, the liquid metal will be splashed in the discharge section and broken into droplets, and the liquid metal will also easily generate backflow when it hits the outer wall 3, making the free liquid surface unstable, and the liquid metal cannot be discharged stably and smoothly

In addition, the too large mandrel of the impeller 1 is also likely to cause a vortex stagnation zone downstream, which may deteriorate the heat transfer of the target and pose a threat to the normal operation of the target

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