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Shukla Vikram,Gera Bhuvaneshwar,Ganju Sunil,Varma Salil,Maheshwari N.K.,Guchhait P.K.,Sengupta S. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
Hydrogen mitigation using Passive Autocatalytic Recombiners (PARs) has been widely accepted methodology inside reactor containment of accident struck Nuclear Power Plants. They reduce hydrogen concentration inside reactor containment by recombining it with oxygen from containment air on catalyst surfaces at ambient temperatures. Exothermic heat of reaction drives the product steam upwards, establishing natural convection around PAR, thus invoking homogenisation inside containment. CFD models resolving individual catalyst plate channels of PAR provide good insight about temperature and hydrogen recombination. But very thin catalyst plates compared to large dimensions of the enclosures involved result in intensive calculations. Hence, empirical correlations specific to PARs being modelled are often used in integral containment studies. In this work, an experimentally validated CFD model of PAR has been employed for developing an empirical correlation for Indian PAR. For this purpose, detailed parametric study involving different gas mixture variables at PAR inlet has been performed. For each case, respective values of gas mixture variables at recombiner outlet have been tabulated. The obtained data matrix has then been processed using regression analysis to obtain a set of correlations between inlet and outlet variables. The empirical correlation thus developed, can be easily plugged into commercially available CFD software.
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.