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5.1.2 Bubble Generator38

5.1.3 Water Test Loop39

5.2 Molten-Salt Steam Generator39

5.2.1 Steam Generator Industrial Program39

5.2.2 Steam Generator Tube Test Stand (STTS)40

5.2.3 Molten-Salt Steam Generator Technology Loop (SGTL)40

5.2.4 Development Basis for Steam Generators Using Molten Salt as the Heat Source40

5.3 Sodium Fluoroborate Test Loop41

5.3.1 Water Addition Test41

5.3.2 Conclusions44

5.4 MSBR Pumps44

5.4.1 MSBE Salt Pump Procurement44

5.4.2 MSBE Salt Pump Test Stand45

5.4.3 ALPHA Pump45

5.5 Remote Welding45

5.5.1 Operational Prototype Equipment45

5.5.2 Cutting Development45

5.5.3 Welding Development47

5.5.4 External Interest49

5.5.5 Design Studies49

6. MSBR INSTRUMENTATION AND CONTROLS51

7. HEAT AND MASS TRANSFER AND THERMOPHYSICAL PROPERTIES53

7.1 Heat Transfer53

7.2 Thermophysical Properties54

7.3 Mass Transfer to Circulating Bubbles57

PART 3. CHEMISTRY

8. FISSION PRODUCT BEHAVIOR60

8.1 Noble Metal Fission Product Behavior60

8.2 Short-Term Fission Product Deposition Tests66

8.3 Fission Product Deposition on the Fifth Set of Graphite and

Hastelloy N Samples from the MSRE Core68

8.3.1 Effect of Surface Roughness68

8.3.2 Effect of Flow Conditions on Deposition68

8.3.3 Comparison of Deposition of Noble Metal Fission Products on Graphite

and Hastelloy N69

8.3.4 Concentration Profiles of Fission Products in Graphite69

8.3.5 Electron Microscope Examination of Particles in the Gas Phase

Above Fuel Salt in the MSRE70

8.4 A Possible Origin of Smokes and Mists Emitted by MSRE Fuel70

8.5 Synthesis of Niobium Fluorides71

8.6 Molybdenum and Niobium Fluoride Solutions in Molten Li2BeF471

8.7 Mass Spectroscopy of Niobium Fluorides73

8.8 Raman Spectra of Crystalline MoF5 and MoF474

9. PROPERTIES OF THE ALKALI FLUOROBORATES78

9.1 Solubility of BF3 Gas in Fluoride Melts78

9.2 Studies of Hydrogen Evolution and Tritium Exchange in Fluoroborate Coolant Salt79

9.3 Reaction of Water with the Sodium Fluoride-Sodium Tetrafluoroborate Eutectic80

9.4 Raman Spectra of Molten NaBF4 and NaF-NaBF4 to 606°C82

9.5 Electronic Polarizability of the Tetrafluoroborate Ion and Various Gaseous Halide

Molecules as Compared with the Free (Gaseous) Halide Ions85

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