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Abstract

It has been shown that pure sodium and stoichiometric urania are compatible at temperatures up to 1600 degrees C. At the high temperatures (1600 degrees C) grain growth and slight surface grain boundary penetration of the spheres was observed but no loss in physical strength was evident. The reaction of sodium with stoichiometric urania-plutonia to form a reduced oxide phase and sodium urano-plutonate, and hence volume swelling, was determined in all the experiments carried out at 850, 1050 and 1600 degrees C. There is evidence that suggest that decomposition of the product phase can occur at 1600 degrees C, with the release of oxygen and that the final volume of the spheres appears to be similar to the starting volume. However, the product spheres from all the reactions were found to be very fragile. The presence of the fission product simulants dissolved in the urania plutonia solid solution caused additional swelling relative to the pure oxide system, when reacted with sodium at 850 and 1050 degrees C. At the higher reaction temperature, 1600 degrees C, the volume swelling was not so great, although the product spheres were still very fragile and hence it was assumed that some decomposition of the product phase had also occurred. The structure of the product is not known, although it is thought that a compound Na-3MO-4 is formed with a similar structure to the urano-plutonate phase where M represents U, Pu and the dissolved simulant additions.

Additional information

Authors: MIGNANELLI M A, CHEMISTRY DIVISION, AERE HARWELL (UK);POTTER P E CHEMISTRY DIVISION, AERE HARWELL (UK), CHEMISTRY DIVISION, AERE HARWELL (UK)
Bibliographic Reference: THIRD INTERNATIONAL CONFERENCE ON LIQUID METAL ENGINEERING AND TECHNOLOGY IN ENERGY PRODUCTION, OXFORD (UK), APRIL 9-13, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31305 ORA
Availability: Can be ordered online
Record Number: 1989122054900 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en