et. al. Measurement of Plutonium and Americium Volatilities Under Thermal Process Conditions: Final Report April 28, 1993

University of California, 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 PuO 2 (s) and PUO 2 /2% AmO 2 (s) in the presence of steam and oxygen at temperatures of 1230-1430 K. We find the volatile species to be PuO 2 (OH) 2 (g) and AmO 2 (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, PuO 2 (s) + 1/2 O 2 (g) + H 2 0(g) = PuO 2 (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, AmO 2 (s.s. in PuO 2 ) + 1/2 O 2 (g) + H 2 0(g ) = AmO 2 (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 O 2 (g), 0.05 atm H 2 0(g), PuO 2 (s) containing 200 ppm AmO 2 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.