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10.2 Relationship of the Distribution of 95Nb in the MSRE to the Presence

of Uranium Trifluoride in the Fuel Salt96

10.3 Power Output of the MSRE Based on the Isotopic Composition of Plutonium98

10.4 Isotopic Composition of Uranium During 233U Operations100

10.5 Surface Tension and Wetting Behavior of the MSRE Fuel and Coolant Salts100

11. FISSION PRODUCT BEHAVIOR104

11.1 Examination of the Fourth Set of Surveillance Specimens from the MSRE104

11.1.1 Radiochemical Analyses of the Graphite104

11.1.2 Radiochemical Analyses of Fission Product Deposition on Metal108

11.1.3 Fission Product Distribution in the MSRE110

11.2 Fission Product Distribution in MSRE Pump Bowl Samples111

11.3 Investigations of the Behavior of Fission Product Niobium118

11.4 Noble Metal Fission Product Chemistry123

11.4.1 Introduction123

11.4.2 Synthesis124

11.4.3 Niobium and Molybdenum Fluoride Solutions in Molten Li2BeF4124

11.4.4 Mass Spectroscopy of Molybdenum and Ruthenium Fluorides126

12. PROPERTIES OF THE ALKALI FLUOROBORATES133

12.1 Phase Equilibria in the Alkali Metal Fluoride-Metal Fluoroborate Binary Systems:

The System RbF-RbBF4133

12.2 Solubility of Na3CrF6 in Sodium Tetrafluoroborate Melts134

12.3 Preparation of Pure Sodium Tetrafluoroborate134

12.4 Investigation of Oxidation of Metals by Fluoroborate Coolant135

12.5 Boron Trifluoride Pressure over Fluoroborate Coolant Salt Admixed with MSBR Fuel Salt136

12.6 Heat Content of Alkali Metal Fluoroborates138

13. PHYSICAL CHEMISTRY OF MOLTEN SALTS140

13.1 Equilibration of Rare-Earth-Containing Molten Fluorides with Various Solids140

13.2 The Oxide Chemistry of Plutonium in Molten Fluorides142

13.3 The CeF3-ThF4 System145

13.4 Equilibrium Phase Relationships in the System LiF-BeF2-CeF3147

13.5 An Investigation of Possible Polymorphic Transitions in Uranium Tetrafluoride148

13.6 Estimation of Activity Coefficients in LiF-BeF2-ThF4 Melts149

13.7 Estimation of Activity Coefficients of Alkaline Earths in Molten Bismuth

and as Chlorides or Fluorides153

13.8 Potentiometric Studies in Molten Fluorides154

13.9 Electrical Conductivities and Ionic Mobilities in the Molten LiF-BeF2 System156

13.10 Electrical Conductivities of Proposed MSBR Fuel Compositions in

the LiF-BeF2-ThF4 System159

13.11 Determination of Liquidus Temperatures in the LiF-BeF2 System from

EMF Measurements of Transference Cells161

13.12 Coordination Effects on U(IV) Spectra in Fluoride Melts165

13.13 Hydrogen Behavior in Molten-Salt Reactor Systems167

13.14 Crystal Structure of the Complex Fluoride (Na,Li)7Th6F31168

14. CHEMISTRY OF MOLTEN-SALT REACTOR FUEL REPROCESSING TECHNOLOGY171

14.1 Distribution of Cerium, Europium, and Strontium Between Bismuth and Lithium Chloride171

14.2 Extraction of Cesium from Lithium Chloride into Bismuth by

Reduction with Lithium at 650°C172

14.3 Removal of Chloride from Simulated MSBR Fuel Solvent by Reaction

with Anhydrous Hydrogen Fluoride173

14.4 Calculated Behavior of Sodium, Rubidium, and Cesium in the

Molten-Salt Breeder Reactor Reprocessing Plant174

14.5 Reduction of Uranium and Protactinium with Titanium176

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