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- W1967216178 abstract "A new technique has been developed to study fission-induced densification and hot-pressing of UO2 at very low temperatures without complications from fracturing or other concurrent thermal effects. Thin disks of UO2 of 0.22 to 20% enrichment and differing microstructural stability, were irradiated in the core of the CP — reactor at temperatures below 200°C and at pressures from 1 atm to 20.7 MPa. Results indicate that the pressurizing medium, NaK, had penetrated the open porosity at high pressure and impeded densification. To rationalize this effect, the previously proposed models for radiationinduced densification are critically reviewed. Modifications to models involving thermal sintering and hot-pressing, and pore resolution appear the most tenable. The former mechanism leads to predictions that fission-induced hot-pressing can occur, and ex-reactor sintering and hot-pressing should correlate with in-reactor densification. The proximity of pores and grain boundaries is also stressed. The effect of NaK logging is rationalized by changes in pore surface energy and by stabilization of small pores aginst complete resolution." @default.
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- W1967216178 date "1981-12-01" @default.
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- W1967216178 title "Fission-induced densification of UO2" @default.
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- W1967216178 doi "https://doi.org/10.1016/0022-3115(81)90502-x" @default.
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