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Title Silicide fuel swelling behavior and its performance in I2S-LWR
Publication Date
Date Accessioned
Degree MS
Discipline/Department Mechanical Engineering
Degree Level masters
University/Publisher Georgia Tech
Abstract The swelling mechanisms of U3Si2 under neutron irradiation in reactor conditions are not unequivocally known. The limited experimental evidence that is available suggests that the main driver of the swelling in this material would be fission gases accumulation at crystalline grain boundaries. The steps that lead to the accumulation of fission gases at these locations are multiple and complex. However, gradually, the gaseous fission products migrate by diffusion. Upon reaching a grain boundary, which acts as a trap, the gaseous fission products start to accumulate, thus leading to formation of bubbles and hence to swelling. Therefore, a quantitative model of swelling requires the incorporation of phenomena that increase the presence of grain boundaries and decrease grain sizes, thus creating sites for bubble formation and growth. It is assumed that grain boundary formation results from the conversion of stored energy from accumulated dislocations into energy for the formation of new grain boundaries.This thesis attempts to develop a quantitative model for grain subdivision in U3Si2 based on the above mentioned phenomena to verify the presence of this mechanism and to use in conjunction with swelling codes to evaluate the total swelling of the pellet in the reactor during its lifetime.
Subjects/Keywords Silicide fuels; Swelling; Recrystallization; Grain subdivision; Nuclear fuel; Accident tolerant fuel; Advanced fuels; Rim effect; High burnup structure; Fuel performance
Contributors Petrovic, Bojan (advisor); Ougouag, Abderrafi (advisor); Deo, Chaitanya (committee member)
Language en
Country of Publication us
Record ID handle:1853/53970
Repository gatech
Date Indexed 2018-01-11
Issued Date 2015-07-27 00:00:00
Note [degree] M.S.;

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