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PART 6. MOLTEN-SALT PROCESSING AND PREPARATION

INTRODUCTION291

23. MEASUREMENT OF DISTRIBUTION COEFFICIENTS IN MOLTEN-SALT-METAL SYSTEMS292

23.1 Extraction of Protactinium from Single-Fluid MSBR Fuels292

23.2 Extraction of Thorium and Rare Earths from Single-Fluid MSBR Fuels295

23.3 Solubility of Thorium in Bismuth297

24. SIMULATED MOLTEN-SALT-LIQUID-BISMUTH CONTACTOR STUDIES298

25. REDUCTIVE EXTRACTION ENGINEERING STUDIES301

26. CONTINUOUS FLUORINATION OF MOLTEN SALT302

27. DISTILLATION OF MSRE FUEL CARRIER SALT306

28. RELATIVE VOLATILITY MEASUREMENTS BY THE TRANSPIRATION METHOD309

29. PREPARATION OF 7LiF-233UF4 CONCENTRATE FOR THE MSRE311

29.1 Cold Shakedown Run311

29.2 Production of the 7LiF-233UF4 Concentrate311

29.3 Packaging of the Concentrate313

30. DEVELOPMENT OF THE TWO-STEP PROCESS FOR PREPARATION OF

7LiF-233UF4 FUEL CONCENTRATE FOR THE MSRE318

30.1 Laboratory Test of Low-Temperature Process318

30.2 Physical Behavior of Powder Beds320

30.3 Oxide Impurity Level in a Product320

30.4 Feasibility of Use of the Two-Step Process320

31. PROCESS DEVELOPMENT ON THE RECOVERY OF URANIUM FROM MSRE321

31.1 Fluorination-Valence State Study321

31.2 Equilibrium of UF6 with NaF at 400°C; Retention of Uranium323

31.3 Effect of Temperature on Sorption of UF6 by NaF:

Comparison of High- and Low-Surface-Area Material324

31.4 Linear Velocity in Sorption Process325

31.5 Disposal of Gaseous F2 in KOH-KI-K2B4O7 Solution325

31.6 Corrosion325

31.7 Helium Dilution of Fluorine326

31.8 Formation of KIO3 Precipitate326

31.9 Neutron Poisoning with K2B4O7326

31.10 Handling of Mist and Smoke from Scrub Solution326

ORGANIZATION CHART327

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