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MOLTEN-SALT REACTOR PROGRAM - page 118 / 122

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PART 3. MATERIALS DEVELOPMENT

6. DEVELOPMENT OF MODIFIED HASTELLOY N52

6.1 Development of a Molten-Salt Test Facility52

6.2 Procurement and Fabrication of Experimental Alloys65

6.2.1 Production Heats of 2% Ti-Modified Hastelloy N65

6.2.2 Semiproduction Heats of 2% Ti-Modified Hastelloy N Containing Niobium69

6.3 Weldability of Commercial Alloys of Modified Hastelloy N69

6.4 Stability of Various Modified Hastelloy N Alloys in the Unirradiated Condition74

6.5 Mechanical Properties of Titanium-Modified Hastelloy N Alloys in the Unirradiated Condition78

6.6 Postirradiation Creep Properties of Modified Hastelloy N82

6.7 Microstructural Analysis of Titanium-Modified Hastelloy N84

6.7.1 Microstructural Analysis of Alloys 503 and 11485

6.7.2 Homogeneous Hastelloy N Alloys88

6.8 Salt Corrosion Studies91

6.8.1 Fuel Salt Thermal Convection Loops93

6.8.2 Fuel Salt Forced Circulation Loop94

6.8.3 Coolant Salt Thermal Convection Loops94

6.9 Corrosion of Hastelloy N and Other Alloys in Steam97

6.10 Observations of Reactions in Metal-Tellurium-Salt Systems100

6.11 Operation of Metal-Tellurium-Salt Systems101

6.11.1 Tellurium Experimental Pot Number 1101

6.11.2 Chromium Telluride Solubility Experiment102

6.11.3 Tellurium Experimental Pot Number 2103

6.12 Grain Boundary Embrittlement of Hastelloy N by Tellurium103

6.13 X-Ray Identification of Reaction Products of Hastelloy N

Exposed to Tellurium-Containing Environments107

6.14 Metallographic Examination of Samples Exposed to Tellurium-Containing Environments108

6.15 Examination of TeGen-1119

6.15.1 Metallographic Observations123

6.15.2 Chemical Analyses for Tellurium124

6.16 Salt Preparation and Fuel Pin Filling for TeGen-2 and -3131

7. FUEL PROCESSING MATERIALS DEVELOPMENT132

7.1 Static Capsule Tests of Graphite with Bismuth and Bismuth-Lithium Solutions132

7.2 Thermal Gradient Mass Transfer Test of Graphite in a Molybdenum Loop133

7.2.1 Weight Changes133

7.2.2 Compositional Changes133

7.2.3 Microstructural Changes137

7.2.4 Discussion of Results137

PART 4. FUEL PROCESSING FOR MOLTEN-SALT REACTORS

8. ENGINEERING DEVELOPMENT OF PROCESSING OPERATIONS142

8.1 Metal Transfer Process Development142

8.1.1 Addition of Salt and Bismuth Phases to Metal Transfer Experiment MTE-3B143

8.1.2 Run Nd-1144

8.1.3 Run Nd-2145

8.1.4 Discussion of Results145

8.2 Salt-Bismuth Contactor Development147

8.2.1 Experiments with a Mechanically Agitated Nondispersing Contactor

in the Salt-Bismuth Flowthrough Facility148

8.2.2 Experiments with a Mechanically Agitated Nondispersing

Contactor Using Water and Mercury149

8.3 Continuous Fluorinator Development152

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