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4.2 Vapor Density Studies in the System BF3-H2O34

5. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS36

5.1 In-line Analysis of MSBR Fuel36

5.2 Tritium Addition Experiments in the Coolant-Salt Technology Facility36

5.3 Electrochemical Studies of Tellurium in Molten L1F-BeF2-ThF4 (72-16-12 mole %)38

5.4 Electrochemical Studies of Oxygenated Species in Molten Fluorides39

PART 3. MATERIALS DEVELOPMENT

6. DEVELOPMENT OF MODIFIED HASTELLOY N42

6.1 Procurement and Fabrication of Experimental Alloys42

6.1.1 Production Heats of 2% Titanium-Modified Hastelloy N42

6.1.2 Semiproduction Heats of 2% Titanium-Modified Hastelloy N

that Contain Niobium45

6.2 Stability of Various Modified Hastelloy N Alloys in the Unirradiated Condition45

6.3 Mechanical Properties of Modified Hastelloy N Alloys in the Unirradiated Condition47

6.4 Postirradiation Creep Properties of Modified Hastelloy N52

6.5 Microstructural Analysis of Modified Hastelloy N59

6.5.1 Production of 2% Titanium-Hastelloy N Alloys with Uniform Carbide Distribution59

6.5.2 Carbon Behavior in Ni-Mo-Cr-Ti Alloys70

6.6 Salt Corrosion Studies75

6.6.1 Thermal Convection Loop Results76

6.6.2 Forced Circulation Loop Results77

6.7 Corrosion of Hastelloy N and Other Alloys in Steam80

6.8 Vapor Pressure Measurements of Metal Tellurides85

6.9 Operation of Metal-Tellurium-Salt Systems86

6.9.1 Tellurium Experimental Pot No. 186

6.9.2 Chromium Telluride Solubility Tests87

6.9.3 Tellurium Screening Test87

6.9.4 Ni3Te2 Capsule Test87

6.9.5 Chromium-Tellurium-Uranium Interaction Experiment87

6.10 Examination of a Hastelloy N Foil Sample Embrittled in the Molten-Salt Reactor Experiment 88

6.10.1 Sample History88

6.10.2 Sample Fracture and Analysis Techniques88

6.10.3 Observations89

6.10.4 Discussion of Observations93

6.11 High-Resolution Fractography of Hastelloy N Alloys Exposed to Tellurium95

6.12 Metallographic Examination of Samples Exposed to Tellurium-Containing Environments100

6.13 Salt-Tellurium Creep Studies121

6.14 Salt Preparation and Fuel Pin Filling for MSR Program

Capsule Irradiation Experiment TeGen-2127

6.14.1 Salt Preparation129

6.14.2 Hydrofluorination130

6.14.3 U4+/U3+ Ratio Adjustment132

6.14.4 Preparation of Salt Fill Vessel132

6.14.5 Salt Transfer132

6.15 Salt Preparation and Filling of TeGen-3 and -4135

6.16 Operation of TeGen-2 and -3136

6.16.1 Operating History of TeGen-2 and -3139

6.16.2 Data Analysis for TeGen-2 and -3139

6.16.3 Preliminary Results of TeGen-2141

6.16.4 Future Irradiations142

6.17 Examination of TeGen-2143

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