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15.3 Studies of Surface Wetting of Graphite by Molten Salt178

15.4 Design of a Third In-Pile Molten-Salt Loop178

16. GAMMA IRRADIATION OF FLUOROBORATE180

PART 5. MATERIALS DEVELOPMENT

17. MSRE SURVEILLANCE PROGRAM183

17.1 General Comments183

17.2 Examination of Hastelloy N Specimens from MSRE Surveillance Facility184

18. GRAPHITE STUDIES188

18.1 Procurement of Special Grades of Graphite188

18.2 Porosity Created in Grade AXF Graphite by Oxidation Pretreatment189

18.3 X-Ray Studies on Graphite190

18.4 Gas Impregnation of Graphite with Carbon191

18.5 Graphite Surface Sealing with Metals192

18.6 Graphite Irradiation Program195

18.7 Nondestructive Testing Studies196

18.7.1 Graphite Ultrasonic Velocity Measurements196

18.7.2 Low-Voltage Radiography197

19. HASTELLOY N198

19.1 Influence of Strain Rate on the Fracture Strain of Hastelloy N198

19.2 Status of Development of the Modified Alloy201

19.3 Effect of Carbon and Titanium on the Unirradiated

Creep-Rupture Properties of Ni-Mo-Cr Alloys204

19.4 Electrical Resistivity of Titanium-Modified Hastelloy N205

19.5 Electron Microscope Studies of Hastelloy N206

19.5.1 Phase Identification Studies in Hastelloy N206

19.5.2 Effect of Silicon on Precipitation in Hastelloy N209

19.5.3 Titanium-Modified Hastelloy N212

19.5.4 Summary213

19.6 Diffusion of Titanium in Modified Hastelloy N213

19.7 Measurement of Residual Stresses in Hastelloy N Welds215

19.7.1 Experimental Results216

19.8 Application of the Narrow-Gap Welding Process to the joining of Hastelloy N217

19.9 Natural Circulation Loops and Test Capsules218

19.9.1 Fuel Salts218

19.9.2 Blanket Salts221

19.9.3 Coolant Salts221

19.10 Forced Circulation Loop226

19.11 Oxidation of Hastelloy N228

20. GRAPHITE-TO-METAL JOINING231

20.1 Graphite Brazing Development231

20.2 Radiation Stability of Brazing Alloys of Interest for Brazing Graphite234

20.3 Graphite-to Hastelloy N Transition joint235

20.3.1 Conceptual Design235

20.3.2 Heavy-Metal Alloy Development236

20.4 Nondestructive Testing Evaluation of Graphite-to-Metal joints238

21. SUPPORT FOR COMPONENTS DEVELOPMENT PROGRAM240

21.1 Remote Welding240

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