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51318-11455-Development of a Corrosion Control Program for Hanford Waste Treatment Plant Recycle Strategy

Cyclic potentiodynamic polarization tests were performed with statistically designed compositional test matrices to determine and optimize the nitrite inhibitor requirements needed to safely store and process the return stream in waste tanks.

 

Product Number: 51318-11455-SG
Author: R. B. Wyrwas / B. J. Wiersma / S. T. Arm, K. D. / A. J. Kim
Publication Date: 2018
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The Hanford Nuclear Reservation uses large underground, carbon steel tanks for interim storage of liquid radioactive waste. 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 testing has shown the waste tanks would be susceptible to pitting corrosion due to the halide contents of the return stream compositions investigated without adequate inhibitor concentrations. Cyclic potentiodynamic polarization tests were performed with statistically designed compositional test matrices to determine and optimize the nitrite inhibitor requirements needed to safely store and process the return stream in the waste tanks.

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

 

The Hanford Nuclear Reservation uses large underground, carbon steel tanks for interim storage of liquid radioactive waste. 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 testing has shown the waste tanks would be susceptible to pitting corrosion due to the halide contents of the return stream compositions investigated without adequate inhibitor concentrations. Cyclic potentiodynamic polarization tests were performed with statistically designed compositional test matrices to determine and optimize the nitrite inhibitor requirements needed to safely store and process the return stream in the waste tanks.

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

 

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