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96087 THE STABILITY OF NITRATE IN HIGH TEMPERATURE WATER

Picture for 96087 THE STABILITY OF NITRATE IN HIGH
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Product Number: 51300-96087-SG
ISBN: 96087 1996 CP
Author: Thomas M. Angeliu, Young J. Kim, Peter L. Andresen, Dale F. Taylor
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Hydrogen water chemistry reduces the stress corrosion cracking (SCC) of boiling water reactor components by lowering the corrosion potential. However, the amount of N16 carried into the main steam line increases as the corrosion potential decreases. This is attributed to the reduction of nitrogencontaining species to ammonia, which is more volatile than nitrate or nitrite and readily partitions to the steam phase. An alternative method to lower the corrosion potential and mitigate SCC without large hydrogen additions is in situ noble metal deposition. With this technique, noble metals catalyze the recombination of hydrogen and oxygen and produce a low corrosion potential with stoichiometric amounts of H2 to O2. However, there is some concern that noble metals will also increase the amount of N16 in the main steam line as a result of the low corrosion potentials and the catalytic nature of these metals. The stability of nitrate and ammonia was studied as a function of corrosion potential, surface area, flow rate and catalytic nature of the surface. Undoped surfaces of 304 stainless steel with surface to volume ratios from...
Hydrogen water chemistry reduces the stress corrosion cracking (SCC) of boiling water reactor components by lowering the corrosion potential. However, the amount of N16 carried into the main steam line increases as the corrosion potential decreases. This is attributed to the reduction of nitrogencontaining species to ammonia, which is more volatile than nitrate or nitrite and readily partitions to the steam phase. An alternative method to lower the corrosion potential and mitigate SCC without large hydrogen additions is in situ noble metal deposition. With this technique, noble metals catalyze the recombination of hydrogen and oxygen and produce a low corrosion potential with stoichiometric amounts of H2 to O2. However, there is some concern that noble metals will also increase the amount of N16 in the main steam line as a result of the low corrosion potentials and the catalytic nature of these metals. The stability of nitrate and ammonia was studied as a function of corrosion potential, surface area, flow rate and catalytic nature of the surface. Undoped surfaces of 304 stainless steel with surface to volume ratios from...
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