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5. SYSTEMS AND COMPONENTS DEVELOPMENT49

5.1 Gaseous Fission Product Removal49

5.1.1 Gas Separator and Bubble Generator49

5.2 Gas System Test Facility51

5.3 Molten-Salt Steam Generator51

5.3.1 Steam Generator Industrial Program52

5.3.2 Steam Generator Tube Test Stand (STTS)52

5.3.3 Molten-Salt Steam Generator Technology Facility (SGTF)52

5.3.4 Development Bases for Steam Generators Using Molten Salt as the Heat Source52

5.4 Sodium Fluoroborate Test Loop52

5.4.1 Pump Bowl and Rotary Element53

5.4.2 BF3 Feed and Salt Level Bubbler Tube55

5.5 Coolant Salt Technology Facility57

5.6 MSBR Pumps58

5.6.1 MSRE Mark 2 Fuel Pump58

5.6.2 MSRE Salt Pump Inspection58

5.6.3 ALPHA Pump59

5.7 Remote Welding59

5.7.1 Automatic Controls59

5.7.2 Pipe Cleaning Tests60

6. MSBR INSTRUMENTATION AND CONTROLS61

6.1 Development of a Hybrid Computer Simulation Model of the MSBR System61

6.1.1 Introduction61

6.1.2 Steam Generator Model61

7. HEAT AND MASS TRANSFER AND THERMOPHYSICAL PROPERTIES64

7.1 Heat Transfer64

7.2 Thermophysical Properties67

7.2.1 Wetting Studies67

7.2.2 Thermal Conductivity69

7.3 Mass Transfer to Circulating Bubbles69

7.3.1 Experiment69

7.3.2 Theory70

PART 3. CHEMISTRY

8. FISSION PRODUCT BEHAVIOR73

8.1 Determination of Tritium and Hydrogen Concentrations in MSRE Pump Bowl Gas73

8.1.1 Calibration Apparatus74

8.1.2 Analysis for Hydrogen75

8.1.3 Tritium Diffusion Studies76

8.2 Examination of Deposits from the Mist Shield in the MSRE Fuel Pump Bowl76

8.2.1 Tritium82

8.3 Synthesis of Niobium Fluorides85

8.4 Reaction Kinetics of Molybdenum and Niobium Fluoride in Molten Li2BeF4 Solutions85

8.5 Mass Spectroscopy of Niobium Fluorides86

9. COOLANT SALT CHEMISTRY AND TRITIUM CONTROL88

9.1 Studies of Hydrogen Evolution and Tritium Exchange in Fluoroborate Coolant88

9.2 Reaction of Sodium Fluoride-Sodium Tetrafluoroborate with Water90

9.3 Identification of Corrosion Products in the Bubbler Tube of the Fluoroborate Test Loop92

9.4 Mass Spectroscopy of Fluoroborate MSR Coolants93

9.5 Spectroscopic Investigations of Hydrogen- and Deuterium-Containing Impurities

in NaBF4 and NaF-NaBF4 Eutectics94

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