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MOLTEN-SALT REACTOR PROGRAM - page 101 / 122

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10.2 Solubility of BF3 in Fluoride Melts78

10.3 Fluorides and Oxyfluorides of Molybdenum and Niobium80

10.3.1 Mass Spectroscopy of Molybdenum Fluorides80

10.3.2 Mass Spectroscopy of Niobium Fluorides and Oxyfluorides80

10.4 Electrical Conductivity of Molten and Supercooled Mixtures of NaF-BeF281

10.5 Glass Transition Temperatures in the NaF-BeF2 System82

10.6 Enthalpy of Lithium Fluoroborate from 298-700K: Enthalpy and Entropy of Fusion85

10.7 Nonideality of Mixing in Li2BeF4LiI86

11. EXAMINATION OF MSRE COMPONENTS89

11.1 Examination of Hastelloy N Components Exposed to Fuel Salt in the MSRE89

11.2 Examination of Components from In-Pile Loop 294

11.3 Observations of Grain Boundary Cracking in the MSRE96

11.4 Examination of a Graphite Moderator Element106

11.5 Auger Analysis of the Surface Layer on Graphite Removed from the Core of the MSRE107

PART 3. MATERIALS DEVELOPMENT

12. GRAPHITE STUDIES111

12.1 The Irradiation Behavior of Graphite at 715°C112

12.2 Procurement of Various Grades of Carbon and Graphite114

12.3 X-Ray Studies116

12.4 Thermal Property Testing117

12.5 Helium Permeability Measurements on Various Grades of Graphite118

12.6 Reduction of Graphite Permeability by Pyrolytic Carbon Sealing119

12.7 The Magnified Topography of Graphite Sealed with Pyrolytic Carbon120

12.8 Reduction of Permeability by Fluid Impregnation121

12.9 Fundamental Studies of Radiation Damage Mechanisms in Graphite122

13. HASTELLOY N125

13.1 Electron Microscopy Studies125

13.1.1 Microstructures of Hf-Modified Hastelloy N Laboratory Melts125

13.1.2 Ni3Ti Precipitation in Ti-Modified Hastelloy N129

13.1.3 Strain-Induced Precipitation in Modified Hastelloy N130

13.2 Mechanical Properties of Unirradiated Modified Hastelloy N132

13.3 Weldability of Several Modified Commercial Alloys132

13.4 Creep-Rupture Properties of Hastelloy N Modified with Niobium, Hafnium, and Titanium137

13.5 Corrosion Studies138

13.5.1 Fuel Salts139

13.5.2 Fertile-Fissile Salt145

13.5.3 Blanket Salt145

13.5.4 Coolant Salt145

13.6 Analysis of High-Level Probe from Sump Tank of PKP-1150

13.7 Forced-Convection Loop Corrosion Studies150

13.7.1 Operation of Forced-Convection Loop MSR-FCL-1A150

13.7.2 Metallurgical Analysis of Forced-Convection Loop MSR-FCL-1A151

13.7.3 Operation of Forced-Convection Loop MSR-FCL-2151

13.7.4 Metallurgical Analysis of Forced-Convection Loop MSR-FCL-2153

13.8 Corrosion of Hastelloy N in Steam153

13.9 Evaluation of Duplex Tubing for Use in Steam Generators156

14. SUPPORT FOR CHEMICAL PROCESSING163

14.1 Construction of a Molybdenum Reductive-Extraction Test Stand163

14.2 Fabrication Development of Molybdenum Components166

14.3 Welding Molybdenum169

14.4 Development of Brazing Techniques for Fabricating the Molybdenum Test Loop172

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