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ORNL-5132

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending February 29, 1976

INTRODUCTIONvii

SUMMARYix

PART 1. MSBR DESIGN AND DEVELOPMENT

1. SYSTEMS AND ANALYSIS2

1.1 TRITIUM BEHAVIOR IN THE COOLANT-SALT TECHNOLOGY FACILITY2

1.1.1 Analysis of Experiments TI and T22

1.1.2 Analysis of Experiment T33

1.1.3 Analysis of Experiment T45

1.2 NEUTRONIC ANALYSIS7

1.2.1 Cross Section Processing for MSBR Calculations7

1.2.2 MSBR Performance Calculations9

1.2.3 Helium Production in the MSBR Vessel9

1.2.4 Production of 232U in the MSBR10

1.2.5 Neutronic Analyses of TeGen Experiments12

1.3 HIGH-TEMPERATURE DESIGN METHODS12

1.3.1 Circular Cylindrical Shells13

1.3.2 Nozzle-to-Spherical Shell Attachment13

1.3.3 Nozzle-to-Cylinder Intersection13

1.3.4 Inelastic Analyses of MSR Piping Subjected to Internal Pressure

and Transient Temperature Cycles13

2. SYSTEMS AND COMPONENTS DEVELOPMENT15

2.1 GAS-SYSTEMS TECHNOLOGY FACILITY15

2.2 COOLANT SALT TECHNOLOGY FACILITY16

2.2.1 Loop Operation16

2.2.2 Tritium Tests16

2.2.3 Equipment Modifications18

2.3 FORCED CONVECTION LOOPS19

2.3.1 Operation of MSR-FCL-2b19

2.3.2 Heat Transfer Studies in MSR-FCL-2b21

2.3.3 Design and Construction of FCL-3 and FCL-422

PART 2. CHEMISTRY

3. FUEL-SALT CHEMISTRY24

3.1 Solubility of Lithium Tellurides in Fluoride Melts24

3.2 Spectroscopy of Telluride Species in Molten Salts27

3.3 Decomposition Pressure of LiTe328

3.4 Porous Electrode Studies in Molten Salts - Electrochemistry of Tellurium

in the LiCl-KCl Eutectic System29

3.5 The Uranium Tetrafluoride-Hydrogen Equilibrium in Molten Fluoride Solutions29

4. COOLANT-SALT CHEMISTRY32

4.1 Hydrolytic Behavior of Na3B3F6O332

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