Effect of Absorbed Hydrogen on the Stress Corrosion Cracking (SCC) Susceptibility of Unirradiated Zircaloy Cladding

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概要

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• Effect of absorbed hydrogen on the stress corrosion cracking (SCC) susceptibility of unirradiated Zircaloy cladding was examined. The data obtained from literatures showed that the normalized ratios of SCC threshold stress (σth) to 0.2% yield stress (σ0.2) claddings, from which the influence of σ0.2 had been eliminated, increased with increasing hydrogen contents below 50 ppm in unirradiated Zircaloy-2 and -4. For Zircaloy-4, the break point was observed in the relationship between normalized ratios of σth to σ0.2 and hydrogen content in sample at hydrogen content of approximately 50 ppm. Thermodynamic calculations were carried out for the reaction between iodine gas and zirconium containing hydrogen. The results suggested that the reactions hardly occurred at increased hydrogen content and zirconium reacted with iodine gas only below 100 ppm of hydrogen. Since these tendencies correspond to those of the normalized ratios of σth to σ0.2 on the hydrogen content, it is considered that hydrogen affects the reactions between iodine gas and zirconium and reduces the SCC susceptibility of Zircaloy cladding.

• 社団法人 日本原子力学会の論文
• 2004-11-25

著者

• Amaya Masaki

  Department Of Reactor Safety Research Japan Atomic Energy Research Institute

• Fuketa Toyoshi

  Department Of Reactor Safety Research Japan Atomic Energy Research Institute

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• Mechanical Energy Generation during High Burnup Fuel Failure under Reactivity Initiated Accident Conditions
• Effect of Absorbed Hydrogen on the Stress Corrosion Cracking (SCC) Susceptibility of Unirradiated Zircaloy Cladding

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