Review of Past Inspection Capabilities and Definition of Inspection Needs

The Double-Shell Tank Integrity Project (DSTIP) uses ultrasonic testing with remote robotic crawlers to examine the double-shell tank (DST) primary tank sidewalls for thinning, pitting, and cracking. This pulse-echo inspection provides a volumetric examination of the metal examined. The examinations are performed using a magnetic crawler that holds the transducers to conduct the examination. The DSTIP has completed two rounds of inspections of the DSTs and the inspections have shown no significant degradation of the areas examined (RPP-RPT-58301). The DSTIP has under development two new methods of examination of the DSTs and plans to explore other techniques for the examination of the tank bottoms. The deployment of these technologies has the goal of improving knowledge of tank integrity. With this better knowledge, the DSTIP can develop better information about the risk of continued used of the DSTs and better inform the RPP of the need for replacement of DSTs.

References
  1. Bandyopadhyay, K., BNL-52527, Guidelines for Development of Structural Integrity Programs for DOE High- Level Waste Storage Tanks, Upton, NY, Brookhaven National Laboratory, 1997.
  2. Pardini, A.F., PNNL-14072, Annual Report: Remotely Operated NDE System for Inspection of Hanford’s Waste Tank Knuckle Regions and Development of a Small Roving Annulus Inspection Vehicle T-SAFT Scanning Bridge for Savannah River Site Applications, Richland, WA, Pacific Northwest National Laboratory, 2002.
  3. Berman, H.S., RPP-25844, Rationale for Requesting Deletion of the Double-Shell Tank Bottom Plate Ultrasonic Inspection Requirement, Richland, WA, CH2M Hill Hanford Group Inc., 2005.
  4. Boomer, K.D., RPP-RPT-58301, Summary of Initial Two Rounds of Double-Shell Tank Ultrasonic Testing, Richland, WA, Washington River Protection Solutions LLC, 2015.
  5. Boomer, K.D., RPP-PLAN-57352, Double-Shell Tank Integrity Improvement Plan, Richland, WA, Washington River Protection Solutions LLC, 2015.
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