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Daejeon, South Korea

Lim D.W.,1045 Daedeok daero | Lim D.W.,Korea University | Park D.J.,1045 Daedeok daero | Park J.Y.,1045 Daedeok daero | And 5 more authors.
Journal of Korean Institute of Metals and Materials | Year: 2014

To investigate the effects of hydrogen on the rupture behavior and mechanical property of ballooned-zirconium cladding after a loss-of-coolant accident, simulated loss-of-coolant-accident tests were carried out using pressurized-zirconium-tube samples with and without hydrogen pre-charging. A prehydrided cladding sample showed lower deformation in the ballooned area and lower rupture temperature than the as-received cladding sample. Ballooned cladding without hydrogen charging showed no significant difference in mechanical property, in spite of a wide range of values for circumferential strain and of a different balloon shape caused by a different heating rate. Pre-hydrided cladding, however, showed an increase in maximum load with increasing heating-rate. The strong relationship between hydrogen content and burst behavior during the loss-of-coolant accident was analyzed and the mechanism by which hydrogen hardens zirconium alloy was explained. Copyright © The Korean Institute of Metals and Materials.

Kim H.-G.,1045 Daedeok daero | Kim I.-H.,1045 Daedeok daero | Park J.-Y.,1045 Daedeok daero | Koo Y.-H.,1045 Daedeok daero
Nuclear Engineering and Technology | Year: 2013

Three types of zirconium base alloy were evaluated to study how their work hardening behavior is affected by alloy composition. Repeated-tensile tests (5% elongation at each test) were performed at room temperature at a strain rate of 1.7 x 10-3 s-1 for the alloys, which were initially controlled for their microstructure and texture. After considering the yield strength and work hardening exponent (n) variations, it was found that the work hardening behavior of the zirconium base alloys was affected more by the Nb content than the Sn content. The facture mode during the repeated tensile test was followed by the slip deformation of the zirconium structure from the texture and microstructural analysis.

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