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Development of a Corrosion Control Program for Liquid Radioactive Wastes Stored in Carbon Steel Waste

Picture for Development of a Corrosion Control Program for Liquid Radioactive Wastes Stored in Carbon Steel Waste
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Large underground, carbon steel tanks are used for interim storage of liquid radioactive waste. The current corrosion control program needs to be updated to account for the susceptibility to pitting corrosion of waste tanks due to the halide content of the secondary waste.

 

Product Number: 51317--9688-SG
ISBN: 9688 2017 CP
Author: Bruce Wiersma
Publication Date: 2017
Industries: Energy Generation , Pipelines, Tanks, and Underground Systems
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Large underground carbon steel tanks are used for interim storage of liquid radioactive waste at the Hanford site. The Hanford Waste Treatment and Immobilization Plant (WTP) is being constructed to treat the high-level waste (HLW) and low-activity waste (LAW) in the tank. The WTP LAW recycle stream will be generated by condensation and scrubbing of the LAW melter off-gas stream. A portion of this stream which will contain substantial amounts of chloride fluoride ammonia and sulfate ions may be returned to the tank farms for storage and evaporation. Presently there are no restrictions on the halide or sulfate concentrations of this return stream prior to transferring to the carbon steel waste tanks. Prior to initiating the process the susceptibility to pitting corrosion of waste tanks due to the halide contents of the return stream was investigated. Cyclic potentiodynamic polarization tests were utilized to determine the nitrite inhibitor requirements needed to safely store and process the return stream.

Key words: radioactive waste, carbon steel, pitting corrosion, electrochemical testing

Large underground carbon steel tanks are used for interim storage of liquid radioactive waste at the Hanford site. The Hanford Waste Treatment and Immobilization Plant (WTP) is being constructed to treat the high-level waste (HLW) and low-activity waste (LAW) in the tank. The WTP LAW recycle stream will be generated by condensation and scrubbing of the LAW melter off-gas stream. A portion of this stream which will contain substantial amounts of chloride fluoride ammonia and sulfate ions may be returned to the tank farms for storage and evaporation. Presently there are no restrictions on the halide or sulfate concentrations of this return stream prior to transferring to the carbon steel waste tanks. Prior to initiating the process the susceptibility to pitting corrosion of waste tanks due to the halide contents of the return stream was investigated. Cyclic potentiodynamic polarization tests were utilized to determine the nitrite inhibitor requirements needed to safely store and process the return stream.

Key words: radioactive waste, carbon steel, pitting corrosion, electrochemical testing

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