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09295 Atmospheric Chamber Testing to Evalute Chloride Induced Stress Corrosion Cracking of Type 304, 304L, and 316L Stainless Steel

Product Number: 51300-09295-SG
ISBN: 09295 2009 CP
Author: Darrell Dunn and Todd S. Mintz
Publication Date: 2009
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Many nuclear plants have begun or will have to start storing spent nuclear waste in onsite dry storage containers, because the room in the spent fuel pools is reaching capacity. Some of these plants are located close to the coast and are in chloride-rich environments. Because the dry storage containers may be made of austenitic stainless steel, a potential concern is their susceptibility to chloride induced stress corrosion cracking. The objective of this work is to evaluate the stress corrosion cracking susceptibility of austenitic type 304, 304L, and 316L stainless steel to chloride stress corrosion cracking. U-bend samples were created out of these alloys and assembled in an environmental chamber. The U-bend samples were heated to various temperatures and subjected to an accelerated corrosion tests, involving directly spraying the samples with simulated sea salt. Cracking was observed in all the samples except those where the temperature remained below a chloride stress corrosion cracking temperature limit. The test was overly conservative because of the direct spray, which is not expected to occur at the actual storage facilities. Secondly, the spray altered U-bend samples temperature making it more susceptible to SCC. In order to create a more realistic, but conservative accelerated test, the factors important to chloride stress corrosion cracking (i.e., relative humidity and temperature) were examined.

Keywords: Stainless Steel, Stress Corrosion Cracking, Atmospheric Corrosion
Many nuclear plants have begun or will have to start storing spent nuclear waste in onsite dry storage containers, because the room in the spent fuel pools is reaching capacity. Some of these plants are located close to the coast and are in chloride-rich environments. Because the dry storage containers may be made of austenitic stainless steel, a potential concern is their susceptibility to chloride induced stress corrosion cracking. The objective of this work is to evaluate the stress corrosion cracking susceptibility of austenitic type 304, 304L, and 316L stainless steel to chloride stress corrosion cracking. U-bend samples were created out of these alloys and assembled in an environmental chamber. The U-bend samples were heated to various temperatures and subjected to an accelerated corrosion tests, involving directly spraying the samples with simulated sea salt. Cracking was observed in all the samples except those where the temperature remained below a chloride stress corrosion cracking temperature limit. The test was overly conservative because of the direct spray, which is not expected to occur at the actual storage facilities. Secondly, the spray altered U-bend samples temperature making it more susceptible to SCC. In order to create a more realistic, but conservative accelerated test, the factors important to chloride stress corrosion cracking (i.e., relative humidity and temperature) were examined.

Keywords: Stainless Steel, Stress Corrosion Cracking, Atmospheric Corrosion
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