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51312-01628-Prediction of Dissolver Lifetimes Through Non-Destructive Evaluation and Laboratory Testing

Picture for Prediction of Dissolver Lifetimes Through Non-Destructive Evaluation and Laboratory Testing
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Product Number: 51312-01628-SG
ISBN: 01628 2012 CP
Author: John I. Mickalonis
Publication Date: 2012
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Non-destructive evaluation was used as the primary method of monitoring the corrosion degradation of nuclear material dissolvers and assessing the remaining lifetimes. Materials were typically processed in nitric acid based (4-14M) solutions containing fluoride concentrations less than 0.2 M. The primary corrosion issue for the stainless steel dissolvers is the occurrence of localized corrosion at the tank bottom and the heat affected zones of the welds. Laboratory data for a range of operational conditions including solution chemistry and temperature were used to assess the impact of processing changes on the dissolver corrosion rate. Experimental and NDE-based general corrosion rates were found to be in reasonable agreement for standard dissolution chemistries consisting of nitric acid with fluorides and at temperatures less than 95 °C. Greater differences were observed when chloride was present as an impurity and temperatures exceeded 100 °C.
Non-destructive evaluation was used as the primary method of monitoring the corrosion degradation of nuclear material dissolvers and assessing the remaining lifetimes. Materials were typically processed in nitric acid based (4-14M) solutions containing fluoride concentrations less than 0.2 M. The primary corrosion issue for the stainless steel dissolvers is the occurrence of localized corrosion at the tank bottom and the heat affected zones of the welds. Laboratory data for a range of operational conditions including solution chemistry and temperature were used to assess the impact of processing changes on the dissolver corrosion rate. Experimental and NDE-based general corrosion rates were found to be in reasonable agreement for standard dissolution chemistries consisting of nitric acid with fluorides and at temperatures less than 95 °C. Greater differences were observed when chloride was present as an impurity and temperatures exceeded 100 °C.
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