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MOLTEN-SALT REACTOR PROGRAM - page 82 / 122

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PART 3. CHEMISTRY

10. CHEMISTRY OF THE MSRE96

10.1 Composition of the MSRE Fuel Salt96

10.2 A Material Balance for Plutonium in the MSRE Fuel Salt98

10.3 Some Factors in Gas Behavior in the MSRE Fuel System102

11. FISSION PRODUCT BEHAVIOR104

11.1 Examination of the Fourth Set Surveillance Specimens from the MSRE104

11.1.1 Examination of Graphite104

11.1.2 Radiochemical Analyses of the Graphite104

11.1.3 Penetration of the Graphite by Uranium106

11.1.4 Radiochemical Analyses and Deposition of Fission Products on

Hastelloy N from the Core of the MSRE107

11.2 Samples from MSRE Pump Bowl107

11.3 Examination of Materials from MSRE Off-Gas Lines109

11.4 The Surface Tension of the MSRE Fuel and Flush Salts109

11.5 Niobium Reduction Potentials112

11.6 Noble-Metal Fission Product Chemistry113

11.6.1 Synthesis and Stability of Molybdenum Fluorides113

11.6.2 Kinetics of MoF3 Disproportionation in Molten 2LiF-BeF2115

11.63 Mass Spectrometric Studies116

11.6.4 Infrared Spectroscopy121

12. PROPERTIES OF THE ALKALI FLUOROBORATES122

12.1 Melting Points and Solid Transition Temperatures of Alkali Fluoroborates122

12.2 Densities and Molar Volumes of Molten Fluoroborates122

12.3 Predicted Volume Changes in Crystalline Alkali Fluoroborates123

12.4 Refractive Indices and Electronic Polarizabilities in Crystalline Alkali Fluoroborates124

12.5 Decomposition Pressures and Sº298 of LiBF4125

12.6 X-Ray Crystal Parameters of LiBF4127

12.7 Mixing Reactions of MSBR Fuel and Coolant Salts127

12.8 Phase Relations in the System NaF-KF-BF3128

12.9 Preparation of Pure NaBF4129

12.10 Attempted Synthesis of NaBF3OH130

13. PHYSICAL CHEMISTRY OF MOLTEN SALTS131

13.1 Phase Relations in the System LiF-BeF2-CeF3131

13.2 Heterogeneous Equilibria Between Cerium-Containing Melts and Various Oxide Phases131

13.3 Liquidus Temperatures in the System LiF-BeF2-ThF4135

13.4 The Solubility of Thorium in Thorium Tetrafluoride135

13.5 Potentiometric Determination of the U4+/U3+ Ratio in Molten Fluorides135

13.6 Refinement of the UF3 Spectrum137

13.7 EMF Measurements with Concentration Cells with Transference in Molten Mixtures

of LiFand BeF2138

13.8 Improved Determination of Electrical Conductance of LiF-BeF2 (66-34 mole %)141

13.9 Electrical Conductivities of Low-Melting NaF-BeF2 Mixtures142

13.10 Viscosity of Molten Salts144

13.11 Density of Molten Fluorides of Reactor Interest145

13.12 Room-Temperature Densities and Estimated Density Change, Upon Melting, of MSBR

Fuel and Coolant Salts146

14. CHEMISTRY OF MOLTEN-SALT REACTOR FUEL REPROCESSING TECHNOLOGY149

14.1 Reductive Extraction of Protactinium at High Concentrations (2000 ppm Level)

from MSBR Fuel Solvent Salt (LiF-BeF2-ThF4, 72-16-12 mole %)

into Molten Bismuth149

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