INFLUENCE OF ALKALI METAL OXIDES AND ALKALINE EARTH METAL OXIDES ON THE MITIGATION OF STRESS CORROSION CRACKING IN CANDU FUEL SHEATHING
39th Annual CNS-CNA Student Conference - 2015 June 01


Presented at:
39th Annual CNS-CNA Student Conference
2015 June 01
Location:
Toronto, Canada
Session Title:
Student Session

Authors:
J. Metzler (Royal Military College of Canada)
G. Ferrier (Royal Military College of Canada)
K. Farahani (Royal Military College of Canada)
P. Chan (Royal Military College of Canada)
E. Corcoran (Royal Military College of Canada)
  

Abstract

Stress corrosion cracking (SCC)can cause failures of CANDU® Zircaloy-4 fuel sheathing. The process occurs when a corrosive element (i.e.,iodine) interacts with a susceptible material that is under sufficient strain at a high temperature. Currently, there is an ongoing effort to improve SCC mitigation strategies for future iterations of CANDU reactors. A potential mechanism forSCC mitigation involves utilizing alkali metal oxides and alkaline earth metal oxides that willsequester corrosive iodine while actively repairing a protective oxide layer on the sheath. SCC tests performed with sodium oxide (Na2O) and calcium oxide (CaO) have shown to decrease significantly the sheath degradation.

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