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MOLTEN-SALT REACTOR PROGRAM - page 26 / 122

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2.8 MSRE Engineering Test Loop (ETL)34

2.8.1 Loop Operations35

2.8.2 Operation of Freeze Valve35

2.8.3 Oxide Removal37

2.8.4 HF Treatment37

2.8.5 ETL Graphite Facility37

2.9 MSRE Maintenance Development41

2.9.1 Placement and Removal of Freeze-Flange Clamp41

2.9.2 Flange Alignment and Pipe-Jacking Tools41

2.9.3 Gasket-Replacement Procedures41

2.9.4 Miscellaneous Disconnects43

2.9.5 Remote Viewing43

2.9.6 Component Removal44

2.10 Brazed-Joint Development45

2.10.1 Joint Design45

2.10.2 Brazed-Joint Testing45

2.10.3 Remote Fabrication of Braze Joint46

2.11 Mechanical-Joint Development51

2.12 Steam Generator51

2.13 Pump Development51

2.13.1 MSRE Fuel Pump52

2.13.2 MSRE Coolant Pump55

2.13.3 Advanced Molten-Salt Pumps56

2.14 MSRE Instrument Development58

2.14.1 Thermocouple Attachments58

2.14.2 Temperature Scanner58

2.14.3 Single-Point Temperature-Alarm System60

2.14.4 Pump-Bowl Level Indicator61

2.14.5 Single-Point Level Indicator66

3. REACTOR ENGINEERING ANALYSIS68

3.1 Reactor Physics68

3.1.1 Analysis of MSRE Temperature Coefficient68

3.1.2 Reactor-Kinetics Studies69

3.1.3 Gamma-Heating Survey70

PART II. MATERIALS STUDIES

4. METALLURGY72

4.1 Dynamic-Corrosion Studies72

4.1.1 Fluoride-Salt Contamination Studies72

4.1.2 Molybdenum-Graphite Compatibility Tests74

4.1.3 Corrosion Effects of Carbon Tetrafluoride77

4.1.4 Examination of Corrosion Inserts from INOR-8 Forced-Convection Loops79

4.2 Welding and Brazing Studies81

4.2.1 Heat Exchanger Fabrication81

4.2.2 Remote Brazing84

4.2.3 Welding of INOR-886

4.2.4 Mechanical Properties of INOR-8-Dissimilar-Metal Welds88

4.3 Mechanical Properties of INOR-889

4.4 Evaluation of MSRE Type Graphite89

4.4.1 Comparison of the Permeation of Graphite by Mercury, and Molten Fluorides92

4.4.2 Removal of Oxygen Contamination from Graphite

with Thermal Decomposition Products of NH4F-HF94

4.4.3 Reaction of ZrO2 with Thermal Decomposition Products of NH4F-HF94

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