In 2006, the Integrated Multi-function Corrosion Probe (IMe?), a new multi-function corrosion
monitoring system, was designed for double-shell tank 241-AN-107 at the Department of Energy's
Hanford Site. As part of the design work, laboratory testing using the IMep data collection hardware,
software, electrodes, and non-radioactive 241-AN-107 waste simulant solutions was conducted to
establish baseline IMe? corrosion monitoring instrumentation performance and to characterize data
produced by the major modes of corrosion that could be expected in Tank 241-AN-107 supernate
simulants, particularly those forms of corrosion that could initiate during off-normal or upset conditions
such as pitting and/or stress corrosion cracking (SCC). Testing demonstrated that standard tank waste
simulants produce tow rates of uniform corrosion on tank steet as monitored with linear polarization
resistance (LPR) and electrical resistance (ER) instrumentation.