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Title: Optimization of Saltcake Removal Flowsheet at SRS through Incorporation of Testing and In-Tank Waste Experience

Saltcake removal at SRS may be performed for several reasons: to provide space for evaporator operation (i.e., to precipitate more salt in the drop tank), to provide feed for salt processing (i.e. immobilize the waste), or to remove the salt for tank closure. Many different salt dissolution techniques have been employed in the 40 years that SRS has been performing salt removal, from a basic “Add, Sit, Remove” method (water is added on top of the saltcake and time is allowed for diffusion), to performing interstitial liquid removal, or using mixing devices to promote contact with the liquid. Lessons learned from previous saltcake removal campaigns, in addition to testing and modeling, have led to opportunities for improvements to the overall saltcake removal process. This includes better understanding of salt properties and behavior during dissolution; the primary concerns for salt dissolution are the release of radiolytic hydrogen and criticality prevention (post-dissolution). Recent developments in salt dissolution include the reuse of dilute supernate and a semi-continuous dissolution (SCD) process, where low volume mixing eductors are used to deliver water near the surface of the saltcake at the same rate as the salt solution is removed and transferred to a receipt tank.
Authors:
 [1] ;  [1]
  1. Savannah River Remediation, LLC., Aiken, SC (United States)
Publication Date:
OSTI Identifier:
1177884
Report Number(s):
SRR-LWE--2014-00169
TRN: US1600124
DOE Contract Number:
AC09-08SR22470
Resource Type:
Conference
Resource Relation:
Conference: Waste Management 2015 (WM2015), Phoenix, AZ (United States), 15-19 Mar 2015
Research Org:
Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; SAVANNAH RIVER SITE; TANKS; SALTS; REMOVAL; DISSOLUTION; HYDROGEN; RADIOLYSIS; TESTING; WASTES; MIXING; OPTIMIZATION; PRECIPITATION; CRITICALITY; SOLIDIFICATION; PROCESSING; SIMULATION; FLOWSHEETS; SODIUM SULFATES