Abstract

Cold spray materials deposition is being investigated for mitigation of chloride-induced stress corrosion cracking (CISCC) in Dry Cask Storage Systems (DCSS) for used nuclear fuel. The welded regions of austenitic stainless-steel canisters in DCSS are under tensile stress and susceptible to environmental chloride corrosion; which can potentially lead to the formation of CISCC. The low thermal input and high throughput nature of the cold spray have led to its active consideration as a viable repair and mitigation approach to manage potential CISCC. The cold spray coatings are under compressive stresses and act as environmental barriers against a Cl-rich environment. Characterization data including thickness; microstructure; adhesion; hardness; and residual stress in the cold spray stainless steel coatings on stainless steel samples with prototypical CISCC are presented. Gas permeability testing of the cold spray coatings are also also discussed.

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