Technical basis for a minimum hydroxide concentration in tanks containing dilute waste | Zendy

Philip E. Zapp | Zendy

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Technical basis for a minimum hydroxide concentration in tanks containing dilute waste

Author(s) -

Philip E. Zapp

Publication year - 1995

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/119887

Subject(s) - hydroxide , corrosion , nitrite , waste management , chemistry , environmental science , pulp and paper industry , metallurgy , materials science , engineering , inorganic chemistry , organic chemistry , nitrate

Laboratory tests were performed to address the protection of waste tank steel from corrosion in situations of elevated temperatures up to 75 C (hot spots) in the sludge layer of Extended Sludge Processing (ESP) tanks. Coupon immersion tests were conducted at 75 C in two ESP simulants at four hydroxide (or pH) levels. The nitrite concentrations of the simulants were calculated from the ESP technical standards based on a temperature of 40 C. The results showed that a hydroxide concentration of at least 0.01 M prevented significant corrosion of the steel at the elevated temperature. This conclusion provides the technical basis for the revised minimum hydroxide concentration of 0.01 M in the draft WSRC 241-82H Control Room Process Requirements, for the ESP tanks

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