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14.1 Determination of Oxide in MSRE Salts167

14.2 Determination of U3+ in Radioactive Fuel by a Hydrogen Reduction Method167

14.3 In-Line Test Facility169

14.4 Electroreduction of Uranium(IV) in Molten LiF-BeF2-ZrF4 at Fast Scan Rates

and Short Transition Times169

14.5 Spectrophotometric Studies of Molten Fluoride Salts171

14.6 Analysis of Off-Gas from Compatibility Tests of MSRE Pump Oil with BF3172

14.7 Development of a Gas Chromatograph for the MSRE Blanket Gas172

PART 4. MOLTEN-SALT IRRADIATION EXPERIMENTS

15. MOLTEN-SALT CONVECTION LOOP IN THE ORR17615.1 Loop Description176

15.2 Operation177

15.3 Operating Temperatures179

15.4 Salt Circulation by Convection180

15.5 Nuclear Heat, Neutron Flux, and Salt Power Density180

15.6 Corrosion181

15.7 Oxygen Analysis182

15.8 Crack in the Core Outlet Pipe182

15.9 Cutup of Loop and Preparation of Samples184

15.10 Metallographic Examination185

15.11 Isotope Activity Calculation from Flux and Inventory History187

15.12 Isotope Activity Balance190

15.13 Uranium-235 Observed in Graphite Samples190

15.14 Penetration of Fission Products into Graphite and Deposition onto Surfaces192

15.15 Gamma Irradiation of Fuel Salt in the Solid Phase193

PART 5. MATERIALS DEVELOPMENT

16. MSRE SURVEILLANCE PROGRAM196

16.1 General Description of the Surveillance Facility and Observations on Samples Removed196

16.2 Mechanical Properties of the MSRE Hastelloy N Surveillance Specimens200

17. GRAPHITE STUDIES208

17.1 Materials Procurement and Property Evaluation208

17.2 Graphite Surface Sealing with Metals211

17.3 Gas Impregnation of MSBR Graphites212

17.4 Irradiation of Graphite215

18. HASTELLOY N STUDIES217

18.1 Improving the Resistance of Hastelloy N to Radiation Damage

by Composition Modifications217

18.2 Aging Studies on Titanium-Modified Hastelloy N217

18.3 Phase Identification Studies in Hastelloy N219

18.4 Hot-Ductility Studies of Zirconium-Bearing Modified Hastelloy N221

18.5 Residual Stress Measurements in Hastelloy N Welds223

18.6 Corrosion Studies226

Fuel Salts226

Coolant Salts227

Equipment Modifications230

18.7 Titanium Diffusion in Hastelloy N230

18.8 Hastelloy N-Tellurium Compatibility233

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