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MOLTEN-SALT REACTOR PROGRAM - page 18 / 122

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PART II. MATERIALS STUDIES

4. METALLURGY55

4.1 Dynamic-Corrosion Studies55

4.1.1 Forced-Convection Loops55

4.1.2 Microprobe Analyses of Surface Film56

4.2 Welding and Brazing Studies58

4.2.1 Solidified-Metal-Seal Development58

4.2.2 Brazing of Graphite59

4.2.3 Heat Exchanger Fabrication63

4.2.4 Mechanical Properties of INOR-864

4.3 Permeation and Apparent-Density Uniformity in Large Pieces of Graphite67

4.3.1 Permeation of AGOT and S-4 Graphites by Molten Salts at Different Pressures67

4.4 Precipitation from Molten Fluoride Fuel in Contact with Various Volumes of Graphite69

4.4.1 Removal of Contamination from Graphite69

4.4.2 INOR-8 - Fuel - Graphite Carburization Tests70

4.5 In-Pile Tests71

5. CHEMISTRY72

5.1 Phase Equilibrium Studies72

5.1.1 MSRE Fuel and Coolant72

5.1.2 Systems Containing ThF472

5.1.3 The System ZrF4-ThF474

5.2 Effect of Tetravalent Fluorides on the Freezing Point of Sodium Fluoride75

5.2.1 Phase Diagram of Fluoride Systems77

5.2.2 The System LiF-YF378

5.2.3 Melting Point of NiF279

5.3 Oxide Behavior79

5.3.1 Oxide Behavior in Fuels79

5.3.2 Zirconium Oxyfluoride and Attempted Preparation of Uranous Oxyfluoride80

5.4 Graphite Compatibility80

5.4.1 Removal of Oxide from Graphite by Treatment with Hydrogen80

5.4.2 Behavior of Graphite when Wetted by a Molten Fluoride81

5.5 Preparation of Purified Materials81

6. ENGINEERING RESEARCH83

6.1 Physical-Property Measurements83

6.1.1 Surface Tension and Density83

6.1.2 Heat Capacity85

6.2 Heat-Transfer Studies86

7. FUEL PROCESSING88

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