Rapid Thermal-Hydraulic Analysis and Design Optimization of ITER Upper ELM Coils

ITER edge localized mode （ELM） coils are important components of the in-vessel coils （IVCs） and they are designed for mitigating or suppressing ELMs. The coils located on the vacuum vessel （VV） and behind the blanket are subjected to high temperature due to the nuclear heat from the plasma, the Ohmic heat induced by the working current and the thermal radiation from the environment. The water serves as coolant to remove the heat deposited into the coils. Based on the results of nuclear analysis, the thermal-hydraulic analysis is performed for the preliminary design of upper ELM coils using a rapid evaluation method based on 1D treatment. The thermal-hydraulic design and operating parameters including the water flow velocity are optimized. It is found that the rapid evaluation method based on 1D treatment is feasible and reliable. According to the rapid analysis method, the thermal hydraulic parameters of two water flow schemes are computed and proved similar to each other, providing an effective basis for the coil design. Finally, considering jointly the pressure drop requirement and the cooling capacity, the flow velocity is optimized to 5 m/s.     

Verification and Optimization of Vacuum Vessel Supports Design in KTX

The Vacuum Vessel(VV) system is an essential component of Keda Torus for experiment(KTX),and various scenarios might take place on it.The VV’s supports should be adequately strong to stand against various loads on VV,which might happen in extreme scenarios.Therefore,the design of VV supports is verified in a single extreme scenario and is subsequently optimized in this report.The numerical simulation based on Finite Element theory is performed as the major method for analysis and optimization.The electromagnetic force in previous analyses serves as the load for the mechanical analyses of supports.During the optimization,the stresses of the W supports decrease remarkably after introducing cotters.Finally,the optimum design has been worked out.It satisfies the requirements regarding the strength and convenience in assembly.     

Mechanical Analysis and Optimization of ITER Upper ELM Coil & Feeder

International thermonuclear experimental reactor （ITER） edge localized mode （ELM） coils are used to mitigate or suppress ELMs. The location of the coils in the vacuum vessel and behind the blankets exposes them to high radiation levels and high temperatures. The feeders provide the power and cooling water for ELM coils. They are located in the chinmey ports and experience lower radiation and temperature levels. These coils and feeders work in a high magnetic field environment and are subjected to alternating electromagnetic force due to the interaction between high magnetic field and alternating current （AC） current in the coils. They are also subjected to thermal stresses due to thermal expansion. Using the ITER upper ELM coil and feeder as an example, mechanical analyses are performed to verify and optimize the updated design to enhance their structural performance. The results show that the conductor, jacket and bracket can meet the static, fatigue and crack threshold criteria. The optimization indicates that adding chamfers to the bracket can reduce the high stress of the bracket, and removing two rails can reduce the peak reaction force on the two rails arising from thermal expansion.     

陶瓷膜精滤工业碳酸钠溶液的研究

采用0.2μm无机陶瓷膜精滤工业碳酸钠溶液.并对精滤前后的碳酸钠溶液的清澈度,有价金属杂质离子含量等进行了对比分析.试验表明,精滤后的碳酸钠溶液清晰、透明,有价金属杂质离子含量降低,精滤后的碳酸钠溶液物理和化学指标接近或达到分析纯要求.采用陶瓷膜精滤工业碳酸钠溶液,能够保持较高的通量,而且受污染的膜经过清洗和再生,通量可以恢复,能满足工业生产的要求.