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96134 CORROSION OF ALUMINUM ALLOYS IN SIMULATED DRY STORAGE ENVIRONMENTS

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Product Number: 51300-96134-SG
ISBN: 96134 1996 CP
Author: H.B. Peacock, R.L. Sindelar, P.S. Lam
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The effect of temperature and relative humidity on the high temperature (up to 150°C) corrosion of aluminum alloys was investigated for dry storage of spent nuclear fuels in a closed or sealed system. A dependency on alloy type, temperature and initial humidity was determined for 1100, 5052 and 6061 aluminum alloys. Results after 4500 hours of environmental testing show that for a closed system, corrosion tends to follow a power law with the rate decreasing with increasing exposure. As corrosion takes place, two phenomena occur: (i) a hydrated layer builds up to resist corrosion, and (ii) moisture is depicted from the system and the humidity slowly decreases with time. At a critical level of relative humidity, corrosion reactions stop, and no additional corrosion occurs if the system remains closed. The results form the basis for the development of an acceptance criteria for the dry storage of aluminum clad spent nuclear fuels. Keywords: spent nuclear fuel, aluminum alloys, corrosion, dry storage, humidity, temperature
The effect of temperature and relative humidity on the high temperature (up to 150°C) corrosion of aluminum alloys was investigated for dry storage of spent nuclear fuels in a closed or sealed system. A dependency on alloy type, temperature and initial humidity was determined for 1100, 5052 and 6061 aluminum alloys. Results after 4500 hours of environmental testing show that for a closed system, corrosion tends to follow a power law with the rate decreasing with increasing exposure. As corrosion takes place, two phenomena occur: (i) a hydrated layer builds up to resist corrosion, and (ii) moisture is depicted from the system and the humidity slowly decreases with time. At a critical level of relative humidity, corrosion reactions stop, and no additional corrosion occurs if the system remains closed. The results form the basis for the development of an acceptance criteria for the dry storage of aluminum clad spent nuclear fuels. Keywords: spent nuclear fuel, aluminum alloys, corrosion, dry storage, humidity, temperature
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