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6. FLUOROBORATE CHEMISTRY43

6.1 Solubility of BF3 in Molten LiF-BeF2-ThF443

6.2 Solubility of BF3 in MSBR Primary Salt Containing 8 Mole % NaF:

Some Safety Considerations43

6.3 Corrosion of Hastelloy N by Fluoroborate Melts44

7. BEHAVIOR OF SIMULATED FISSION PRODUCTS47

7.1 Effects of Selected Fission Products on Metals47

7.2 Stability and Volatility of Metal Tellurides48

8. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS50

8.1 In-Line Chemical Analysis of Molten Fluoride Salt Streams50

8.2 Voltammetric Studies of Protonated Species in Molten NaBF4-NaF (92-8 mole %)50

8.3 Infrared Spectral Studies of NaBF4-NaF52

8.4 Studies of Protons in Molten NaBF452

8.5 Analysis of Coolant Cover Gas53

8.6 Spectral Studies of Molten Salts54

9. OTHER MOLTEN-SALT RESEARCH56

9.1 The Disproportionation Equilibrium of UF3 Solutions in Graphite56

9.2 EMF Studies of Oxide Equilibria in Molten Fluorides57

9.3 The Lithium Fluoride-Tetrafluoroborate Phase Diagram58

9.4 Chronopotentiometry Based on Diffusion of Mobile Nonelectroactive Species59

PART 3. MATERIALS DEVELOPMENT

10. INTERGRANULAR CRACKING OF STRUCTURAL MATERIALS EXPOSED TO FUEL SALT63

10.1 Cracking of Samples Electroplated with Tellurium63

10.2 Intergranular Cracking of Several Alloys When Exposed to Tellurium Vapor63

10.3 Mechanical Properties of Structural Materials Containing Strontium and Tellurium69

10.4 The Isothermal Diffusion of 127Te Tracer in Hastelloy N,

Ni-200 and Type 304L Stainless Steel Specimens70

10.5 Tube-Burst Experiments71

10.6 Strain Cycle Experiments76

10.7 Identification of Reaction Products from Tellurium-Structural-Material Interactions79

10.7.1 Knudsen Cell Reactions81

10.7.2 Possible Tellurides in Hastelloy N82

10.7.3 Tellurides from Knudsen Cell Reactions83

10.7.4 Tellurides from Other Reaction Methods83

10.7.5 Summary85

10.8 Auger Electron Spectroscopy of Intergranular Fracture Surfaces of Nickel

and Hastelloy N Exposed to Tellurium Vapor at 700°C86

10.8.1 Method87

10.8.2 Nickel88

10.8.3 Hastelloy N88

10.9 Design of an In-Reactor Experiment to Study Fission Product Effects on Metals90

10.9.1 Design Criteria90

10.9.2 Configuration91

10.9.3 Thermal Considerations91

10.9.4 Containment93

10.9.5 Fuel Salt Chemistry93

11. GRAPHITE STUDIES95

11.1 The Irradiation Behavior of Graphite95

11.2 Procurement and Characterization of Various Grades of Graphite100

11.3 Characterization of ORNL Graphites101

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