A study on hydride reorientation of Zircaloy-4 cladding tube under stress

Title
A study on hydride reorientation of Zircaloy-4 cladding tube under stress
Authors
김용수
Keywords
EMBRITTLEMENT; SPENT FUEL INTEGRITY; INTERIM DRY STORAGE; MECHANICAL-PROPERTIES; TERMINAL SOLUBILITY; ORIENTED HYDRIDES; FORMING METALS; PRESSURE TUBE; HYDROGEN; ZIRCONIUM
Issue Date
2015-01
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF NUCLEAR MATERIALS, v. 456, Page. 246-252
Abstract
A study of the radial hydride formation in cold worked and stress relieved (CWSR) Zircaloy-4 cladding was performed using a ring tensile method and finite element analysis. Un-irradiated Zircaloy-4 cladding ring specimens charged with hydrogen were tested at various temperatures and loading conditions. Measured threshold stresses at loaded temperatures of 400 degrees C, 335 degrees C, 300 degrees C, and 235 degrees C turned out to be 60 +/- 5 MPa, 68 +/- 5 MPa, 75 +/- 6 MPa, and 90 +/- 6 MPa, respectively, demonstrating the tendency of decreasing threshold stress with increasing temperature. These stresses were lower than previously reported ones and close to the lower bound of collected data from the literature. These results reveal that high temperature preheating seems to affect an initiation of the reorientation. This implies that temperature increase caused by the vacuum drying of spent fuel assemblies for transportation can promote the hydride reorientation, leading to mechanical deterioration of the cladding. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11754/21264http://www.sciencedirect.com/science/article/pii/S0022311514006229
ISSN
0022-3115
DOI
http://dx.doi.org/10.1016/j.jnucmat.2014.09.032
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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