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MOLTEN-SALT REACTOR PROGRAM - page 20 / 122

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2.12.4 Frozen-Lead Pump Seal53

2.13 MSRE Engineering Test Loop53

2.14 MSRE Instrument Development59

2.14.1 Thermocouple End Seals59

2.14.2 Instrument and Power Disconnects61

2.14.3 Pump-Bowl Level Indicator64

2.14.4 Single-Point Level Device67

3. REACTOR ENGINEERING ANALYSIS70

3.1 Criticality Calculations70

3.2 Reactivity Worth of Control Tubes72

3.3 Preliminary Calculations for Core Containing INOR-8 Tubes73

3.4 MSRE Biological Shielding and Associated Dose Rates73

PART II. MATERIALS STUDIES

4. METALLURGY77

4.1 Dynamic-Corrosion Studies77

4.1.1 Status of Test Program77

4.1.2 Examination of INOR-8 Loops77

4.1.3 Examination of Inconel Loops80

4.1.4 Molybdenum-Graphite Compatibility Tests81

4.2 Welding and Brazing Studies81

4.2.1 Welding of INOR-881

4.2.2 Solidified-Metal Seal Development84

4.2.3 Sump-Type Seal Development87

4.2.4 Metal-Fiber Seal Development87

4.3 INOR-8 Development89

4.3.1 Structural Stability of 18% Mo Alloys89

4.4 Mechanical Properties of INOR-889

4.5 Impregnation of Graphite by Molten Salts91

4.5.1 Permeation Screening Tests on Large and Small Pipe93

4.5.2 Oxidation and Permeation96

4.6 Precipitation of UO2 from Fluoride Salts96

4.7 Precipitation of ZrO2 from MSRE Fuel96

4.8 Removal of Oxygen Contamination from Graphite97

4.8.1 Purging with Molten Fluorides97

4.8.2 Purging with Ammonium Bifluoride98

4.8.3 Reaction of INOR-8 with the Thermal-Decomposition Products of NH4F-HF98

5. IN-PILE TESTS100

5.1 Graphite-Fuel Capsule Experiments100

5.2 Examination of Graphite Specimen from Experiment ORNL-47-2102

6. CHEMISTRY109

6.1 Phase Equilibrium Studies109

6.1.1 The System LiF-BeF2-ZrF4-ThF4-UF4109

6.1.2 The System LiF-BeF2-ZrF4110

6.1.3 The System LiF-BeF2111

6.1.4 Phase Equilibria in the System NaF-BeF2-ThF4111

6.1.5 The System CsF-ZrF4111

6.1.6 Crystal Structure of LiF-SbF5112

6.1.7 Index to ORNL Work on Fused-Salt Phase Studies113

6.1.8 Solubility of HF in Molten Fluorides113

6.1.9 Solubility of BF3 in MSRE-Type Fuels114

6.1.10 Freezing-Point Depressions in Sodium Fluoride119

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