L. Timonova1 , O. Lyakhova1 , S. Babeshkin2
1Institute of Radiation Safety and Ecology of the National Nuclear Centre of the Republic of Kazakhstan
2Institute of Atomic Energy
Abstract:
A comprehensive radiation assessment and possible long-term predictive estimates of the radiation situation at places of long-term storage require oversight of radioactive gas emanation. For this reason it is necessary to develop and implement respective recommendations for research and future oversight of the content of radioactive gases in air of SNF storage areas. Experimental research was undertaken to fulfill the task that was set during IVG.1.M physical start-ups. Air was sampled from the conduit of reactor ventilation system using two devices: 'Purga' - a cryogenic device and 'OS1700' - a tritium manifold. Air sampled collected by 'Purga' was measured with a gamma-spectrometer. Air samples collected with the tritium manifold were analyzed with a beta-spectrometer. Experimental studies conducted registered the major radioactive gases: 41Ar 30 to 4,500 Bq/m3, 85Kr up to 280 Bq/m3, - 87Kr up to 720 Bq/m3, 88Kr up to 840 Bq/m3, 135Xe up to 140 Bq/m3, НТО up to 20 Bq/m3 and Тgas up to 3 Bq/m3. Experimental studies undertaken have shown applicability in principle to use sampling and analytical equipment for assessing radioactive gases emanated in a SNF storage area at BN-350.
