Strain rate dependence of iodine-induced stress corrosion cracking of Zircaloy-4 under internal pressurization tests

Ryu, Woo Seog; Lee, Jun Young; Kang, Young Hwan; Suk, Ho Chun

doi:10.1007/bf00587669

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…All these were more recently confirmed in [16], where it is concluded that breaking of the surface protective film that is required for SCC to occur, is counteracted by its healing at low strain rates, of course in the necessary oxidizing environment. An additional circumstantial evidence is provided by the SR program [17], where it is noticed during hot-cell PIE that the BG8-1 fuel rod subjected to a slow ramp and unexpectedly failed, had a MPS (missing pellet surface) defect at the location of the primary PCI crack.…”

Section: Suggested Slow Ramp Mitigating Mechanism and Conclusionmentioning

confidence: 77%

Towards understanding beneficial effects of slow power ramps

Arimescu

Karlsson

2015

Journal of Nuclear Science and Technology

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The topic of pellet cladding interaction (PCI) in light water reactor (LWR) fuel rods is reviewed and further explored in this paper by considering the mitigating effect of slow ramps. To that end, a number of PCI mitigating mechanisms were considered in relation to several failure criteria, including peak stress, strain energy density and other cumulative damage formulations. Towards a tentative working hypothesis for PCI mitigation by low ramp rate, the results fuel codes simulations of some slow ramps that have been part of the 3rd SCIP MWS (Studsvik Cladding Integrity Program Modeling WorkShop) are used in the paper in order to support or question the applicability of different possible mechanisms, considered as potential mitigating factors in slow ramps. In addition, the results of out-of-pile biaxial tests on irradiated cladding are presented for a loading scheme that aimed at reproducing the stress rate conditions of a slow ramp; the relatively small contribution of stress relaxation during the power increase stage of a slow ramp that was noticed in code calculations was confirmed by the mechanical biaxial tests. Thus, the main outcome of the code calculations in the 3rd SCIP MWS and related SCIP studies coupled with the literature review was that slow ramps' benefits cannot be explained by mechanical effects only and a hypothesis is proposed that is based on the protective role of the cladding inner oxide and the healing of its cracks during a slow ramp provided the corresponding fuel rod gap chemistry exists.

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Section: Suggested Slow Ramp Mitigating Mechanism and Conclusionmentioning

confidence: 77%

Towards understanding beneficial effects of slow power ramps

Arimescu

Karlsson

2015

Journal of Nuclear Science and Technology

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Influencing factors and mechanism of iodine-induced stress corrosion cracking of zirconium alloy cladding: A review

Liu

et al. 2022

Int J Miner Metall Mater

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Stress Corrosion Cracking of Structural Nuclear Materials: Influencing Factors and Materials Selection

Oliveira

2020

ICMS

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: Stress corrosion cracking (SCC) plays a central role in the development of improved structural nuclear materials. Complex interactions between microstructure, alloy composition, manufacturing and environmental factors make the understanding of this phenomenon difficult. This work aimed at reviewing the scientific literature on the SCC behavior of structural nuclear materials in order to identify the main factors that govern this phenomenon. Additionally, interaction between these factors and materials selection is discussed in order to provide a comprehensive basis for the successful design of metallic materials with improved resistance to SCC.

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Strain rate dependence of iodine-induced stress corrosion cracking of Zircaloy-4 under internal pressurization tests

Cited by 3 publications

References 12 publications

Towards understanding beneficial effects of slow power ramps

Towards understanding beneficial effects of slow power ramps

Influencing factors and mechanism of iodine-induced stress corrosion cracking of zirconium alloy cladding: A review

Stress Corrosion Cracking of Structural Nuclear Materials: Influencing Factors and Materials Selection

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