NEUP Final Report: Multilayer Composite Fuel Cladding and Core Internals for LWR Performance Enhancement and Severe Accident Tolerance

Short, Michael P.; McAlpine, Samuel W.; Tonks, Michael; Rezwan, Aashique A.; Zhang, Jinsuo; Leong, Amanda; Xie, Yi; Rausch, Jason; Salkin, Jon; Bachav, Mukesh; Ehrnstén, Ulla; Penttilä, Sami; Peltonen, Soili; Nevasmaa, Pekka; Pohja, Rami; Hänninen, Hannu; Sarikka, Teemu; Qiang, Rui

doi:10.2172/1572872

Cited by 3 publications

(3 citation statements)

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“…Nowadays, the research of coolant pipes applied in nuclear power plants focuses on corrosion and oxidation resistance [7][8][9]18,20]; however, the traditional welding structure of FGC may cause stress concentration and shorten the life of the system. In this study, Fick's law for diffusion equation is applied to the silicon concentration evaluation of Fe-12Cr-2Si films; stress distribution from the LBE hydrostatic pressure is evaluated for high-temperature environments at 700, 1000 and 1200 • C.…”

Section: Fgms and Material-property Estimation Approachesmentioning

confidence: 99%

“…The silicon diffusion coefficient in Fe-12Cr-2Si can be roughly estimated through D si = 10 −14 m 2 /s at high temperatures in the Fe-12Cr-2Si/Cr interfacial region aged experiment [20]. The diffusion of silicon in titanium dioxide, which has 10% oxygen content, can also be expressed by an Arrhenius equation; the diffusion coefficient can be evaluated through a linear function for temperatures above 300…”

Section: The Diffusion Boundary Conditions For the Evaluation Of Corr...mentioning

confidence: 99%

“…The Large-Break Loss-of-Coolant Accident (LBLOCA) is considered the worst scenario of nuclear power failure, the temperature could rise to 1200 • C when this accident happened and make the cladding wall fatigue failure [14][15][16]. Due to the high temperature condition of nuclear power plant, the consideration for thermal stress measurement and corrosion testing is necessary [17][18][19][20]. However, the structure for the coolant pipe is constructed with the Fe-Cr-Si solid solution coating welded on the T91 substrate metal with a thickness of 17~80 µm [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Enhancement for FGM Coolant Pipes Subjected to High-Temperature and Hydrostatic Pressure

Lo¹,

Lai²

2022

Coatings

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The objective of this paper is to enhance the corrosion resistance of coolant pipes in high temperature and lateral hydrostatic pressure in critical engineering environment, especially for circular coolant pipes under hydrostatic pressure of LBE (lead-bismuth eutectic) applications in nuclear power plants. The resistance against corrosion caused by LBE liquid is mainly formed by Fe-12Cr-2Si solid solutions coatings on the pipe. The silicon concentration in Fe-12Cr-2Si can interact with LBE as an effective oxidized compound such as SiO2 and Fe2SiO4 when the silicon concentration is higher than 1.25 wt.%. The oxide film formed on the coating can resist the LBE corroding in the Fe-12Cr-2Si structure. The primary material of a constructing coolant pipe is T91 ferritic-martensitic alloys, and the surface anti-corrosion coating is Fe-12Cr-2Si solid solution. With a high strength structure, FGC (functionally graded composite material), ensures that the pipe resists the corrosion from LBE liquid. In this study, both the steady-state stress values and silicon concentration are evaluated at 700, 1000, and 1200 °C to know the fatigue problems. The research result indicates the FGM (functionally graded material) structure performs better in promoting the margin of safety on stress distribution and reserving the silicon concentration on the inner surface higher than 1.25 wt.% over 60 years as compared to the FGC structure with 34 μm thickness of Fe-12Cr-2Si coating in a high temperature environment.

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