November 2019 Hanford Tanks status updates summary
Workers have installed interim barriers over parts of the T and TY farms, and a barrier over the entire SX farm to prevent surface moisture from seeping into the ground. We've approved design for construction of a barrier in the TX farm, and Energy's agreed to install an interim barrier over the U farm next. We're currently negotiating with the U.S. Department of Energy on installation of interim barriers over Hanford's remaining single-shell tank farms in the following order: S, BY, A, AX, BX, B, T and TY.
Our agency and Energy approved a Tri-Party agreement milestone aimed at removing more liquid waste from single-shell tanks. The milestone, titled M-45-93, was established to investigate the options available to remove more liquids from the single-shell tanks by putting the remaining waste into a form that would prevent potential future leaks.
C-farm closure integration with groundwater actions
The Tri-Party Agencies are pursuing an interim record of decision to expedite remediation of known groundwater contaminant plumes. These are more efficiently remediated in the near-term and support a corrective action decision for C-farm and other areas at Hanford.
The actual design of the surface barrier for Waste Management Area C doesn't exist yet, but the draft Waste Incidental to Reprocessing Evaluation includes a baseline design, with some stipulations. Prior to barrier construction, specific closure barrier designs will be evaluated and the most appropriate design will be chosen.
We're in the process of developing a permit modification to Hanford's sitewide permit to incorporate the closure plan for C-farm. The public will have a chance to comment on proposed closure activities through the public comment process before it's approved.
In addition, we're negotiating enforceable Tri-Party Agreement milestones with Energy for retrieving waste from the catch tanks and a vault in C-farm, along with non-enforceable target milestones for initiation of post-retrieval closure actions.
Retreival underway in A-AX farms
With retrieval now finished in C-farm, retrieval work shifted to A-AX farms, including six A tanks and four AX tanks. While nearly all of the waste in C-farm's single shell tanks was sludge, about 80 percent of the waste in A-farm and 95 percent in AX-farm is saltcake.
Hanford Tanks status update, November 2019
Hanford Tanks status update, January 2019
Hanford Tanks status update, March 2018
Hanford Tanks status update, December 2016
Hanford Tanks status update, April 2016
Hanford Tanks, May 2014
Other various tank publications