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Characterisation of Sodium Aerosol in Cover Gas Region of SILVERINA Loop

Category: Aerosol and Atmospheric Chemistry

Volume: 15 | Issue: 5 | Pages: 1813-1822
DOI: 10.4209/aaqr.2014.09.0193
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Amit kumar1, Venkatesan Subramanian 1, Subramanian Krishnakumar2, Ramakrishnan Baskaran1, Sivasubramanian Chandramouli2, Balasubramanian Venkatraman1

  • 1 Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam - 603 102, India
  • 2 Device Development and Rig Services Division, Indira Gandhi Centre for Atomic Research, Kalpakkam -603 102, India

Highlights

Sodium aerosol size distribution in the cover gas region is found to be mono-model.

MMD increases linearly with increase of sodium pool temperature.

Mass concentration of aerosol increases with increase of Sodium pool temperature.

Mass concentration & MMD are higher near the sodium pool than middle and top level.

Experimental results are validated with theoretical simulation.


Abstract

Sodium aerosols are continuously being generated in the cover gas region of Sodium cooled Fast Reactor (SFR) from the hot sodium pool and they play major role in heat and mass transfer to the roof top plug and side walls. In order to characterize the sodium aerosols, a study has been initiated by conducting experiments in one of the sodium loop facility SILVERINA of IGCAR. This paper describes design and installation of aerosol sampling system in SILVERINA loop, results and analysis of sodium aerosol characteristics, measurement of temperature profile of cover gas region, theoretical simulation of sodium aerosols mass concentration for the given pool (loop) condition and validation of the model with experimental results.

The sodium aerosol size distribution in cover gas region is found to be mono-model. The Mass Median Diameter (MMD) of sodium aerosol is found to be varying from 1.5–11.5 µm as a function of sodium pool temperature and found to increase linearly with increase of sodium pool temperature. The sodium aerosol mass concentration is found to be varying from 0.026–35.6 g/m3 as a function of sodium pool temperature and it is found to follow 3rd order polynomial regression with increase of sodium pool temperature. The sodium aerosol mass concentration and MMD are found to be higher near the sodium pool compared to middle of the cover gas region and near the roof top. A theoretical simulation has been carried out to predict the sodium aerosol mass concentration with respect to pool temperature for a given geometry of the vessel and the theoretical and experimental mass concentration of sodium aerosols found to have good agreement.

Keywords

Fast Reactor Cover gas region Sodium aerosol Size distribution Mass concentration


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