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MOLTEN-SALT REACTOR PROGRAM - page 23 / 122

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2.5.4 Sample-Transport Container and Removal Seal40

2.5.5 Sampler-Enricher Design40

2.6 MSRE Core Development40

2.6.1 Heat Transfer Coefficients in the Lower Head of the Reactor Vessel40

2.6.2 Fuel-Age Measurements in the Lower Head of the Reactor Vessel41

2.6.3 Studies on the Disposition of Fine Particles

in the Lower Head of the Reactor Vessel42

2.6.4 Fluid-Dynamic-Induced Power Oscillations44

2.6.5 Full-Scale MSRE Core Model44

2.7 Helium Purification44

2.8 Pump Development46

2.8.1 MSRE Fuel Pump46

2.8.2 Water Test of MSRE Coolant Pump54

2.8.3 Advanced Molten-Salt Pumps54

2.9 Graphite-Molybdenum Compatibility Test54

2.10 MSRE Engineering-Test Loop54

2.10.1 Oxide-Flush Run54

2.10.2 Freeze-Valve Operation55

2.10.3 Level Indicator for Molten Salt (Test Loop)56

2.10.4 Graphite-Handling Facility56

2.11 MSRE Maintenance Development56

2.11.1 Maintenance Plan56

2.11.2 Remote-Maintenance Mockup58

2.11.3 MSRE Model61

2.11.4 Portable Maintenance Shield61

2.12 Brazed-Joint Development61

2.13 Mechanical-Joint Development64

2.14 Steam Generator65

2.15 MSRE Instrument Development67

2.15.1 Pump Bowl Level Indicator67

2.15.2 Single-Point Level Indicator72

2.15.3 Temperature Scanner77

2.15.4 Thermocouple Attachments and End Seals78

3. REACTOR ENGINEERING ANALYSIS83

3.1 Reactor Physics83

3.1.1 Analysis of MSRE Temperature Coefficient of Reactivity83

3.1.2 Rod Worth, Flux, and Power Density Distributions in MSRE83

3.1.3 Gamma-Ray and Fast-Neutron Heating in Thimbles85

3.1.4 Reactors with INOR-8 Fuel Tubes86

3.2 Nitrogen-16 Activity in Fuel Salt89

3.3 Residual Activity in Pump Bowl and Heat Exchanger90

3.4 Reactor-Cell Shielding91

3.4.1 Top Shield91

3.4.2 Side Shield92

PART II. MATERIALS STUDIES

4. METALLURGY93

4.1 Dynamic-Corrosion Studies93

4.1.1 Examination of INOR-8 Forced-Convection Loops93

4.1.2 Molybdenum-Graphite Compatibility Tests96

4.1.3 Compatibility of INOR-8 - 2% Nb and Molten Fluorides99

4.1.4 Fluoride-Salt Contamination Studies99

4.2 INOR-8 Development100

4.2.1 Structural Stability of Nickel-Based, 18% Molybdenum Alloys100

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