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MOLTEN-SALT REACTOR PROGRAM - page 105 / 122

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PART 3. MATERIALS DEVELOPMENT

12. INTERGRANULAR CRACKING OF STRUCTURAL MATERIALS EXPOSED TO FUEL SALT109

12.1 Examination of Hastelloy N Components from the MSRE109

12.1.1 Freeze Valve 105109

12.1.2 Control Rod Thimble111

12.1.3 Sampler Cage Rod115

12.1.4 Mist Shield116

12.2 Auger Analysis of the Surface Layers on Graphite from the Core of the MSRE117

12.3 Auger Analysis of the Surface of a Fractured Hastelloy N Sample122

12.4 Intergranular Corrosion of Hastelloy N123

12.5 Tube-Burst Experiments126

12.6 Cracking of Samples Electroplated with Tellurium128

12.7 Cracking of Hastelloy N Being Creep Tested in Tellurium Vapor128

12.8 Intergranular Cracking of Materials Exposed to Sulfur and Several Fission Product Elements134

12.9 Mechanical Properties of Hastelloy N Modified with Several Elements136

12.10 Status of Intergranular Cracking Studies141

13. GRAPHITE STUDIES144

Introduction144

13.1 Graphite Development144

13.2 Procurement of Various Grades of Carbon and Graphite149

13.3 Texture Determinations149

13.4 Thermal Property Testing150

13.5 Nominal Helium Permeability Parameters for Various Grades of Graphite151

13.6 Reduction of Helium Permeability of Graphite by Pyrolitic Carbon Sealing151

13.7 Characterization of Pyrocarbon Sealants for Graphite Using Reflected Light

and Scanning Electron Microscopes155

14. HASTELLOY N161

14.1 Development of a Titanium-Modified Hastelloy N161

14.2 Alloys with Exceptional Strength163

14.3 Weldability of Commercial Alloys of Modified Hastelloy N166

14.4 Electron Microscope Studies171

14.4.1 Intermetallic Precipitation in Hastelloy N172

14.4.2 Precipitation in New Commercial Alloys173

14.4.3 Modification of X-Ray Diffraction Techniques173

14.5 Salt Corrosion Studies174

14.5.1 Fuel Salt174

14.5.2 Fertile-Fissile Salt177

14.5.3 Blanket Salt177

14.5.4 Coolant Salt177

14.6 Forced-Convection Loop Corrosion Studies179

14.6.1 Operation of Loop MSR-FCL-1A179

14.6.2 Results from Loop MSR-FCL-1A179

14.6.3 Operation of Loop MSR-FCL-2180

14.6.4 Results from Loop MSR-FCL-2180

14.7 Corrosion of Hastelloy N in Steam182

14.8 Evaluation of Duplex Tubing for Use in Steam Generators189

15. SUPPORT FOR CHEMICAL PROCESSING192

15.1 Construction of a Molybdenum Reductive-Extraction Test Stand192

15.2 Fabrication Development of Molybdenum Components194

15.3 Welding of Molybdenum195

15.4 Development of Brazing Techniques for Fabricating the Molybdenum Test Loop195

15.5 Compatibility of Materials with Bismuth197

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