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Sawarn T.K.,Post Irradiation Examination Division | Banerjee S.,Post Irradiation Examination Division | Pandit K.M.,Post Irradiation Examination Division | Anantharaman S.,Post Irradiation Examination Division
Nuclear Engineering and Design | Year: 2014

Deformation and rupture characteristics of Indian PHWR fuel pin under loss-of-coolant accident (LOCA) conditions were investigated to develop rupture database that will be used for the formulation and verification of mathematical modeling. Experiments were carried out on single fuel pins over a wide range of initial internal pressures (3-73.5 bar) and in the heating rate range of 7-12 °C/s under inert gas environment. The cladding surface temperature and internal pressure data were recorded on-line during the experiment and the cladding deformation and rupture measurements were made on the fuel pins after the test. Rupture characteristics were studied with the help of macroscopic examination of the rupture location. It was found that the phase transformation from α to α + β and α + β to β has a great influence on the material ductility. Two circumferential strain maxima and a minimum at the burst temperatures of ∼790 °C and ∼1030 °C and ∼880 °C respectively were observed. The burst data of this experiment have been utilized to develop the burst correlation for Zircaloy-4 cladding of PHWR fuel pins. © 2014 Elsevier B.V. All rights reserved.

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