What We Are Doing

Expert Panel Workshop

Because Hanford’s single-shell waste tanks must remain in service for may more years, Washington River Protection Solutions has formed the Single-Shell Tank Integrity Project Expert Panel to assist in guiding structural and leak integrity topics related to Hanford’s 149 aging single-shell tanks. The panel, which includes experts in the fields of structural and seismic analysis, corrosion, soils, materials, non-destructive testing and chemistry, was asked by WRPS to review the past and present operations of Hanford’s tanks, review past and present tank integrity programs, and then to recommend enhancements to support the extension of the operational life of the tanks.

Workshop participants Based on information presented to the panel members said they consider the single-shell tanks to be structurally sound. Barring a major seismic event they said they believe a catastrophic failure of a tank is not credible. As part of their preliminary recommendations, the panel has identified the need for assessments of the rebar and the concrete conditions in the tanks, a series of analyses using waste simulant to show the impacts of waste on rebar and concrete, and taking vertical core samples of selected concrete tank walls. Other recommendations included continued dome deflection surveys, and corrosion studies to assess the ability to prevent the development of any new tank leaks.

Documents for 1st Single-Shell Tank Integrity Workshop

Summary of First Single-Shell Tank Integrity Expert Panel Workshop - January 2009
Panels First Workshop Outbriefing
Herb Berman Presentation
Kayle Boomer SST History
Susan Eberlein Vadose Zone
Ken Johnson Tank Integrity Criteria
Mike Rinker Structural Integrity
Ruben Mendoza SST Retreival
Jason Engeman SST Inspections
Kayle Boomer Corrosion Summary
Dennis Washenfelder Current Status
Jacob Reynolds Characterization
Weirsma SSC at Savannah River
Jim Field Leak Assessment
Al Pardini Non-Destructive Evaluation

Documents for 2nd Single-Shell Integrity Workshop

Technical Integration Central Process Double-Shell Tank and Single-Shell Tank Integrity
Workshop Outbriefing
Berman SST Integrity Status
Engeman Visual Inspection & Capabilities
Connelly Subsurface Barriers
Jones Use of Cathodic Protection on SST Liners
Kennedy Structural Integrity Findings & Recommendations
Jones Analysis of Simulated Waste Impacts on Rebar & Concrete
Thompson Potential Applications of NDE to SSTs-Structural
Beavers Corrosion Potential Measurements of Reinforced Steel in Concrete in SSTs
Stock SST Liner Leak Origins
Stock Chemical Remediation
Stock Propensity for New Leaks
Frankel Measurement of SST Potential
Frankel Testing Ionic Pathway Through Tanks
Jones Laboratory Assessment of Leak Rates Through Sludge and Saltcake With Simulated Waste
Jones Effects of Wall Thinning and Temperature on Residual Stresses at Welds
Wiersma Leak Detection and Monitoring
Thompson Potential Applications of NDE to SSTs
Subramanian Efforts to Meet Programmatic Needs
Cullen Soils and Vadose Zone Findings and Recommendations
Stock Liquid Control
Frankel Thermal Spray Coating of Tank Interior
Summary of Second Single-Shell Tank Integrity Expert Panel Workshop - April 2009
SST Expert Panel Integrity Project

Documents for 3rd Single-Shell Integrity Workshop

Documents for 4th Expert Pannel Workshop

Introduction, Welcome, and Administrivia (RPP-48997)
WRPS Status Report Recommendations and Tri-Party Agreement Overview (RPP-49000)
Single-Shell Tank Integrity Project Analysis of Record (RPP-49011)
Visual Inspections (RPP-49002)
241-C-107 Large Riser Install for Mobile Arm Retrieval System (RPP-49003)
Single-Shell Tank Sidewall Coring and 241-C-107 Dome Sample (RPP-49004)
Vadose Zone Barriers and Characterization (RPP-49028)
Single-Shell Tank Waste Staging (RPP-49006)
Concrete Chemical Testing (RPP-49007)
Leak Detection Enhancement Recommendations (RPP-49010)
Testing for Ionic Pathways Through Tanks (RPP-49068)
Chemical Testing of Liner Recommendations LD-3, LD-5 (RPP-49008)
WRPS Expectations Review (RPP-49009)