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Kotak Vimal,Pathrose Anil,Sengupta Samiran,Gopalkrishnan Sugilal,Bhattacharya Sujay 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
The jet pump can be used in a test device of a nuclear reactor for high flow amplification as it reduces inlet flow requirement and thereby size of the process components. In the present work, a miniature jet pump was designed to meet high flow amplification greater than 3. Subsequently, experiments were carried out using a test setup for design validation and performance evaluation of the jet pump for different parameters. It was observed that a minimum pressure of 0.6 bar (g) was required for the secondary fluid inside the jet pump to ensure cavitation free performance at high amplification. Spacing between the nozzle tip and the mixing chamber entry point had significant effect on the performance of the jet pump. Variation in primary flow, temperature and area ratio also affected the performance. It was observed that at high flow amplification, the analytical solution differed significantly from experimental results due to very large velocities encountered in the miniature size jet pump
Harish Jagat Pant,Sunil Goswami,Sunil B. Chafle,Vijay Kumar Sharma,Vimal Kotak,Vikram Shukla,Amitanshu Mishra,Nilesh C. Gohel,Sujay Bhattacharya 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
A radiotracer investigation was carried out in a Thermal Stratification Test Facility (TSTF) with objectivesof investigating the dispersion and diffusion of radionuclide and effectiveness of the thermocline tominimize the radionuclide content in the hot water layer. Technetium-99m (99mTc) as sodium pertechnetate was used as a radiotracer in the investigation. Qualitative analysis showed that a thermoclineis formed within the TSTF and is effective in preventing the transport of radionuclide from bottomsection to the top section of the facility. It was found that the radiotracer injected at the bottom of thepool took about 17.4 h to disperse from bottom to the top of the facility. The results of the investigationhelped in understanding the effectiveness of hot water layer and thus to minimize the pool top radiationlevels.