The EEC evaluates the chemical cleaning process to remove the scale deposits from the 242-16H (2H) evaporator pot using nitric acid and in-pot neut…
Office of NEPA Policy and Compliance
July 7, 2026
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The EEC evaluates the chemical cleaning process to remove the scale deposits from the 242-16H (2H) evaporator pot using nitric acid and in-pot neutralization. The goal of the cleaning process is continued operation of the 2H Evaporator, thereby gaining tank space to store additional waste. The chemical cleaning process is required every 2 to 2.5 years. Major waste producing programs include the Defense Waste Processing Facility (DWPF), whose recycle stream goes to the H-Area Tank Farm. This revision (Rev. 3) includes an update gadolinium nitrate concentration used in the nitric acid cleaning process to reflect current critical safety operating limit (CSOL).