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9.5.1 The Polarizability of the Tetrafluoroborate Ion85

9.5.2 Test of a Recent Theoretical Set of Ion Polarizabilities86

9.5.3 Effect of Interaction Between Halide Ions on Polarizability87

10. PHYSICAL CHEMISTRY OF MOLTEN SALTS89

10.1 Liquidus Temperature of the Salt Mixture LiF-BeF2-ThF4 (70-15-15 mole %)89

10.2 Equilibrium Phase Relationships in the System LiF-BeF2-CeF389

10.3 Phase Relationships in the System CeF3-ThF489

10.4 The Instability of PuOF and the Solubility of Pu(III) in MSBR Solvent Salt91

10.5 Oxide, Chemistry of Protactinium in MSBR Fuel Solvent Salt92

10.6 Entropies of Molten Salts95

10.7 All-Metal Conductance Cell for Use in Molten Salts98

10.8 Glass Transition Temperatures in NaF-BeF2 Mixtures99

10.9 Correlations of Electrical Conductivities in Molten LiF-BeF2-ThF4 Mixtures101

10.10 Coordination Effects on U(IV) Spectra in Fluoride Melts103

11. CHEMISTRY OF MOLTEN-SALT REACTOR FUEL TECHNOLOGY106

11.1 Removal of Fluoride from Molten LiCl106

11.2 Distribution of Sodium and Potassium in the Metal Transfer Process at 650°C107

11.3 Removal of Lanthanides from Lithium Chlorides on Zeolites109

11.4 Zirconium Platinide as a Removal Agent for Rare Earths110

12. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS FOR

MOLTEN-SALT REACTORS113

12.1 Spectral Studies of MSRE Fuel Samples113

12.2 Spectral Studies of Actinide Ions in Molten Fluoride Salts114

12.3 Reference Electrode Studies in Molten Fluorides115

12.4 Kinetic Studies on the Ni/Ni(II) Couple in Molten LiF-BeF2-ZrF4115

12.5 Analytical Studies of NaBF4 Coolant Salt116

12.6 In-Line Chemical Analyses118

PART 4. MATERIALS DEVELOPMENT

13. EXAMINATION OF MSRE COMPONENTS119

13.1 Examination of Tubing from the MSRE Radiator120

13.2 Examination of Thermocouple Wells from the MSRE Coolant Circuit126

14. GRAPHITE STUDIES134

14.1 Procurement of New Grades of Graphite134

14.2 General Physical Property Measurements135

14.3 Graphite Fabrication: Chemistry135

14.4 Measurement of Thermal Conductivity of Graphite141

14.5 X-Ray Studies141

14.6 Reduction of Graphite Permeability by Pyrolytic Carbon Sealing142

14.7 HFIR Irradiation Program145

15. HASTELLOY N149

15.1 Influence of Titanium on the Strengthening of an Ni-Mo-Cr Alloy149

15.2 Effect of Composition on the Postirradiation Mechanical Properties of Modified Hastelloy N153

15.3 Comparison of Laboratory and Commercial Heats of Modified Hastelloy N156

15.4 Effect of Prior Aging on Irradiation Damage at 760°C159

15.5 Weldability of Commercial Alloys160

15.6 Mechanical Properties of Unirradiated Commercial Modified Alloys161

15.7 Electron Microscope Studies164

15.8 Corrosion Studies165

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