University of Califoia, Lawrence Livermore National Laboratory.
April 28, 1993. pp. 30.
Измерение летучести плутония и америция в условиях
термического процесса: заклю-чительный отчет, 28 апреля
1993.
Oscar H. Krikorian et al.
Ливерморская национальная лаборатория им. Лоуренса
Библиография 19 ссылок Abstract
We have used the transpiration method to measure volatilities of Pu and Am from PuO2(s) and PUO2/2% AmO2(s) in the presence of steam and oxygen at temperatures of 1230-1430 K. We find the volatile species to be PuO2(OH)2(g) and AmO2(OH)2(g) at vapor pressures on the order of 10"10 atm and 10-12 atm respectively under measurement conditions. For the Pu volatilization reaction, PuO2(s) + 1/2 O2(g) + H20(g) = PuO2(OH)2(g), we obtain a free energy of reaction of AGOT = 231.3 - 0.0109 T in kJ/mol, and for the Am volatilization reaction, AmO2(s.s. in PuO2) + 1/2 O2(g) + H20(g ) = AmO2(OH)2(g), we obtain AGOT= 223.9- 0.0109 T in kJ/mol.
We apply these results to the Rocky Flats Plant Fluidized Bed Incinerator to assess the amount of volatile Pu and Am produced in the secondary combustor chamber. Taking operating conditions of 550°C combustor temperature, 40 kmols/h of total gas flow at 1 atm pressure, 0.1 atm O2(g), 0.05 atm H20(g), PuO2(s) containing 200 ppm AmO2 in the bed, and 6000 h of operating time per year, gives volatilization rates of 7 x 10-6g Pu/y and 4 x 10-9g Am/y.
Oscar H. Krikorian et al.
Ливерморская национальная лаборатория им. Лоуренса
Библиография 19 ссылок Abstract
We have used the transpiration method to measure volatilities of Pu and Am from PuO2(s) and PUO2/2% AmO2(s) in the presence of steam and oxygen at temperatures of 1230-1430 K. We find the volatile species to be PuO2(OH)2(g) and AmO2(OH)2(g) at vapor pressures on the order of 10"10 atm and 10-12 atm respectively under measurement conditions. For the Pu volatilization reaction, PuO2(s) + 1/2 O2(g) + H20(g) = PuO2(OH)2(g), we obtain a free energy of reaction of AGOT = 231.3 - 0.0109 T in kJ/mol, and for the Am volatilization reaction, AmO2(s.s. in PuO2) + 1/2 O2(g) + H20(g ) = AmO2(OH)2(g), we obtain AGOT= 223.9- 0.0109 T in kJ/mol.
We apply these results to the Rocky Flats Plant Fluidized Bed Incinerator to assess the amount of volatile Pu and Am produced in the secondary combustor chamber. Taking operating conditions of 550°C combustor temperature, 40 kmols/h of total gas flow at 1 atm pressure, 0.1 atm O2(g), 0.05 atm H20(g), PuO2(s) containing 200 ppm AmO2 in the bed, and 6000 h of operating time per year, gives volatilization rates of 7 x 10-6g Pu/y and 4 x 10-9g Am/y.