Hanford Double-Shell Tank Visual Inspections

Double-shell waste storage tanks located at the Hanford site in Washington state store millions of gallons of mixed waste which contains hazardous and radioactive constituents. To monitor their condition and ensure continued viability, these tanks are inspected periodically through a comprehensive integrity program. One key element of the double-shell tank (DST) integrity program is remote visual inspections to monitor the condition of the interior and exterior of the primary tank and the annulus region. Improvements have been made to the DST visual inspection program after anomalies were seen during a routine visual inspection of the annulus of Tank 241-AY-102 (AY-102) in August 20121. Shortly after these routine inspections, tank AY-102 was determined to be leaking from the primary tank bottom. After the tank AY-102 leak, higher emphasis was placed on the visual inspection program. As a defense-in-depth, this emphasis increases the knowledge about base integrity of the remaining DSTs. Since more stress has been placed on the visual inspection program, ongoing improvements to the program are essential to determine the leak integrity of the remaining twenty seven DSTs.

References
1. J.K. Engeman, et al., “Tank 241-AY-102 Leak Assessment Report,” Washington River Protection Solutions LLC Company Report, RPP-ASMT-53793, Rev. 0, November 2012. 2. J.K. Engeman, et al., “Double-Shell Tank Integrity Inspection Report for 241-AN Tank Farm,” Washington River Protection Solutions LLC Company Report, RPP-RPT-31599, Rev. 6, September 2014. 3. C.L. Girardot, et al., “Double-Shell Tank Integrity Inspection Report for 241-AZ Tank Farm,” Washington River Protection Solutions LLC Company Report, RPP-RPT-34310, Rev. 1, September 2014. 4. C.L. Girardot, et al., “Double-Shell Tank Integrity Inspection Report for 241-AY Tank Farm,” Washington River Protection Solutions LLC Company Report, RPP-RPT-34311, Rev. 2, December 2014. 5. K.M. Siemion, et al., “Double-Shell Tank Integrity Inspection Report for 241-AP Tank Farm,” Washington River Protection Solutions LLC Company Report, RPP-RPT-38738, Rev. 4, July 2015. 6. J.K. Engeman and M.J. Rodgers, “Double-Shell Tank Integrity Inspection Report for 241-SY Tank Farm,” Washington River Protection Solutions LLC Company Report, RPP-RPT-39149, Rev. 1, March 2010. 7. K.E. Riedner, et al., “Double-Shell Tank Integrity Inspection Report for 241-AW Tank Farm,” Washington River Protection Solutions LLC Company Report, RPP-RPT-42147, Rev. 3, June 2015.
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