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ORNL-5078

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending August 31, 1975

SUMMARY

PART 1 - MSBR DESIGN AND DEVELOPMENT

1. SYSTEMS AND ANALYSIS2

1.1 Tritium Behavior in Molten Salt-Systems2

1.1.1 MSBR Calculations2

1.1.2 Coolant Salt Technology Facility3

1.2 Xenon Behavior in MSBR8

1.3 Neutronic Analysis9

1.3.1 MSBR Studies9

1.3.2 TeGen Capsules12

1.4 High-Temperature Design Methods12

2. SYSTEMS AND COMPONENTS DEVELOPMENT16

2.1 Gas-Systems Technology Facility16

2.1.1 Cavitation and Salt-Pump Shaft Oscillations16

2.1.2 Salt-Pump Performance Data and Calibration of Variable-Flow Restrictors18

2.1.3 Salt-Pump Fountain Flow19

2.1.4 Densitometer Studies22

2.2 Coolant-Salt Technology Facility (CSTF)22

2.2.1 Loop Operation22

2.2.2 Salt Mist Test23

2.2.3 Tritium Experiments24

2.3 Forced Convection Loops26

2.3.1 Operation of MSR FCL-2b26

2.3.2 Design and Construction of FCL-3 and FCL427

PART 2. CHEMISTRY

3. FUEL SALT CHEMISTRY29

3.1 Compounds in the Lithium-Tellurium System29

3.2 Spectroscopy of Tellurium Species in Molten Salts30

3.3 The Uranium Tetrafluoride-Hydrogen Equilibrium in Molten Fluoride Solutions31

3.4 Porous Electrode Studies in Molten Salts32

3.5 Fuel Salt-Coolant Salt Interaction Studies34

3.6 Lattice and Formation Enthalpies of First-Row Transition Metal Fluorides37

4. COOLANT SALT CHEMISTRY41

4.1 Chemistry of Sodium Fluoroborate41

4.2 Corrosion of Structural Alloys by Fluoroborates42

5. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS44

5.1 In-line Analysis of Molten MSBR Fuel44

5.2 Tritium Addition Experiments in the Coolant-Salt Technology Facility45

5.3 Electroanalytical Studies of Iron(II) in Molten LiF-BeFZ-ThF4 (72-16-12 mole %)47

5.4 Voltammetric Studies of Tellurium in Molten LiF-BeFZ-ThF4 (72-16-12 mole %)48

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