Author: Long, Zhiling ; Monts, David L. ; Su, Yi ; Kirk, Paula G. ; Mott, Melissa A. ; Jang, Ping-Rey ; Lindner, Jeffrey S. ; Okhuysen, Walter P. ; Ettien, John ; Arunkumar, Rangaswami

The Oak Ridge Research Reactor (ORRR) was operated as an isotope production and irradiation facility from March 1958 until March 1987. The US Department of Energy permanently shut down and removed the fuel from the ORRR in 1987. The water level must be maintained in the ORRR pool as shielding for radioactive components still located in the pool. The U.S. Department of Energy’s Office of Environmental Management (DOE EM) needs to decontaminate and demolish the ORRR as part of the Oak Ridge cleanup program. In February 2004, increased pit corrosion was noted in the pool’s 6-mm (1/4")-thick aluminum liner in the section nearest where the radioactive components are stored. If pit corrosion has significantly penetrated the aluminum liner, then DOE EM must accelerate its decontaminating and decommissioning (D&D) efforts or look for alternatives for shielding the irradiated components. The goal of Mississippi State University’s Institute for Clean Energy Technology (ICET) was to provide a determination of the extent and depth of corrosion and to conduct thermodynamic modeling to determine how further corrosion can be inhibited. Results from the work will facilitate ORNL in making reliable disposition decisions. ICET’s inspection approach was to quantitatively estimate the amount of corrosion by using Fouriertransform profilometry (FTP). FTP is a non-contact 3-D shape measurement technique. By projecting a fringe pattern onto a target surface and observing its deformation due to surface irregularities from a different view angle, the system is capable of determining the height (depth) distribution of the target surface, thus reproducing the profile of the target accurately. ICET has previously demonstrated that its FTP system can quantitatively estimate the volume and depth of removed and residual material to high accuracy. The results of our successful initial deployment of a submergible FTP system into the ORRR pool are reported here as are initial thermodynamic modeling results.

18 Oct 2006·Advanced Environmental, Chemical, and Biological Sensing Technologies IV

Quantitative imaging characterization of aluminum pit corrosion in Oak Ridge research reactor pool

Author: David L. Monts ; Walter P. Okhuysen ; Melissa A. Mott ; Ping-Rey Jang ; Yi Su ; Paula G. Kirk ; Teresa Leone ; Zhiling Long ; O. Perry Norton ; Rangaswami Arunkumar ; John Ettien

In Feb. 2004, increased pit corrosion was noted in the nuclear reactor pool's 6-mm (1/4")-thick Al liner in the section nearest where the radioactive components are stored.ICET's inspection approach is to quant. estimate the amount of corrosion using Fourier transform profilometry (FTP).FTP is a noncontact 3-dimensional shape measurement technique.By projecting a fringe pattern onto a target surface and observing its deformation due to surface irregularities from a different view angle, FTP is capable of determining the height (depth) distribution of the target surface, thus reproducing the profile of the target accurately.ICET has previously demonstrated that its FTP system can quant. estimate the volume and depth of removed and residual material to high accuracy.

01 Sep 2004·Chemical Health & Safety

Management of time sensitive chemicals (I): Misconceptions leading to incidents

Author: Blair, David ; Boada-Clista, Lydia ; Simmons, Fred ; Bailey, Jim ; Marsick, Dan ; Whyte, Helena ; Quigley, David

Time-sensitive chems. are those chems. that when stored for prolonged periods can develop hazards that were not present in the original formulation.Several issues are described regarding these chems.First, time-sensitive chems. continue to be stored for so long that addnl. hazards are created that can put workers at increased risk.Second, workers many times do not realize that these materials have addnl. risks present which makes them even more dangerous.Third, the chem. and management of time-sensitive chems. is not well understood.Lastly, it appears that, when a time-sensitive chem. is stored too long and discovered, workers are unsure of how to safely mitigate or dispose them.What is needed is a better understanding of the chem. of time-sensitive chems., proper management techniques to control them, and appropriate procedures and properly trained personnel to mitigate aged time-sensitive chems. when they are discovered.

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