Lead-based reactor liquid metal heavy metal thermal engineering progress
Recently, the Institute of Nuclear Energy Safety of the Chinese Academy of Sciences’ Institute of Hefei Institute of Physical Sciences successfully carried out tests on the flow and heat transfer characteristics of simulated fuel assemblies for lead-tellurium reactors, and obtained important data on thermal hydraulics, marking the development of multi-functional technologies in the past five years. The comprehensive experimental circuit of lead-antimony reactor technology—the first phase of KYLIN-II experimental study was completed. It basically mastered the circulation drive of high-temperature and high-density liquid heavy metal media, the heat transfer and sub-channel detection technology of high-power reactor simulation fuel assemblies, and multi-media coupling. A number of key thermal-hydraulic technologies for lead-based reactors such as heat exchange are the key to the successful implementation of the “Second-generation critical nuclear fission energy—ADS transmutation system†strategic pilot technology special subcritical reactor project, laying a solid foundation in thermo-hydraulics. basis.
The liquid lead-antimony alloy has excellent thermal physics performance and thermal-hydraulic performance, and its thermal-hydraulic-related problems are one of the core issues that need to be clarified and solved firstly for the fourth-generation lead-based reactors in pursuit of economy and safety. Based on the KYLIN-II experimental platform, researchers from the Institute of Nuclear Safety conducted CLEAR-I full-scale 61-beam simulation of fuel assembly flow and heat transfer experiments in lead-based reactors, natural circulation steady state and transient mechanism experiments, and gas lift enhancement cycles. Typical experimental thermal experiments such as LOFA, obtained a number of important thermal hydraulic experimental data of liquid metal, and basically grasped the core technologies of liquid metal thermal engineering experiment, measurement control and loop operation, and realized the thermal hydraulic characteristics of liquid lead hydrazine. The full range of "pulse". The research work will directly provide important experimental data and technical accumulation for CLEAR series lead-based reactor structural design and verification, and will also bring more broad prospects for the application and development of liquid metal in the non-nuclear field.
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