MOBILIZATION, POISONING, AND FILTRATION OF F-CANYON TANK 804 SLUDGE

Poirier, M ; Thomas Peters, T ; Samuel Fink, S

Savannah River Site (S.C.)

关键词: Removal;    Sludges;    Filtration;    Hydroxides;    Sodium Hydroxides;   

DOI  :  10.2172/891523
RP-ID  :  WSRC-CP-2006-00009
RP-ID  :  DE-AC09-96SR18500
RP-ID  :  891523

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Savannah River Site (SRS) Deactivation and Decommissioning (SDD) Organization is evaluating options to disposition the F-Canyon 800 series underground tanks (including removal of the sludge heels from these tanks) and requested assistance from Savannah River National Laboratory (SRNL) personnel to develop methods to effectively mobilize the sludge from these tanks (i.e., Tanks 804, 808, and 809). Because of the high plutonium content in Tank 804 (estimated to be as much as 1500 g), SDD needs to add a neutron poison to the sludge. They considered manganese and boron as potential poisons. Because of the large amount of manganese needed and the very slow filtration rate of the sludge/manganese slurry, SDD requested that SRNL investigate the impact of using boron rather than manganese as the poison. SRNL performed a series of experiments to help determine the disposal pathway of the material currently located in Tank 804. The objectives of this work are: (1) Determine the mobility of Tank 804 sludge when mixed with 10-15 parts sodium hydroxide as a function of pH between 10 and 14. (2) Determine the solubility of boron in sodium hydroxide solution with a free hydroxide concentration between 1 x 10{sup -4} and 2.0 M. (3) Recommend a filter pore size for SDD such that the filtrate contains no visible solids. (4) Determine whether a precipitate forms when the filtrate pH is adjusted to 12, 7, or 2 with nitric acid.