Technical Evaluation of Accelerated Basin De-Inventory Material Addition to Sludge Batch 11 (Rev. 1)

Abstract

Substantial changes to the report are tracked by revision bars. Changes in the headers, footers, Table of Contents, List of Tables, and reference numbering are not tracked by revision bars. • Title Page: Replaced page i to reflect the current SRNL report template • Executive Summary: Added a conclusion regarding soluble enriched uranium.Added a conclusion that allowing for concurrent transfers of sodium hydroxide and Accelerated Basin De-inventory (ABD) material does not alter the conclusions of the document. Removed a recommendation regarding depleted uranium additions and the impact on soluble enriched uranium. Added a recommendation for Savannah River Mission Completion (SRMC) to evaluate the applicable risk. • Section 1.0: Added description of email request for technical evaluation of allowing concurrent transfers of sodium hydroxide and ABD material. Added a clarification of the depleted uranium addition plan. • Section 3.1: Added a clarification of the depleted uranium addition plan.• Section 3.1.3: Described the depleted uranium addition plan and gave a more detailed description of its impacts on the supernate uranium enrichment in Tank 51. Described the risks involved. • Section 3.1.4: Changed the wording to indicate a risk involving uranium enrichment of Tank 51 supernate • Section 3.2.2.2, changed free hydroxide concentration from "0.6 to 1.2 mol/L" to ">1.2 mol/L" • Section 3.3: New section containing a technical evaluation of allowing concurrent transfers of sodium hydroxide and ABD material. Specific areas addressed included aluminum removal, actinide enrichment in the decanted supernate, rheological behavior, and Gd solubility. • Section 4.0: Added a conclusion regarding soluble enriched uranium. Added a conclusion that allowing for concurrent transfers of sodium hydroxide and ABD material does not alter the conclusions of the document. Removed a recommendation regarding depleted uranium additions and the impact on soluble enriched uranium. Added a recommendation for SRMC to evaluate the applicable risk. • Section 5.0: Added Reference 9 and updated References 15, 16, and 31.