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Application to Iodine Removal from MSBR Fuel23

4.4 Protactinium Oxide Precipitation Studies24

4.5 Solubility of BF3 in Salts of Molten-Salt Reactor Interest24

5. COOLANT SALT CHEMISTRY25

5.1 Oxide and Hydroxide Chemistry of Fluoroborate Melts25

5.2 Corrosion of Structural Alloys by Fluoroborate Melts25

5.3 Evaluation of Fluoroborate and Alternate Coolants26

5.4 Density and Viscosity of Several Molten Fluoride Mixtures28

6. TRITIUM BEHAVIOR30

6.1 Permeation of Hydrogen Isotopes Through Structural Metals30

6.2 The Solubilities of Hydrogen, Deuterium, and Helium in Molten Li2BeF430

6.3 Chemisorption of Tritium on Graphite30

7. OTHER RESEARCH34

7.1 The Wetting of Graphite by Bismuth and Bismuth-Lithium Alloys

as Determined by the Sessile Drop Method34

8. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS35

8.1 In-Line Analysis of Breeder Fuel35

8.2 Determination of Trivalent Uranium in Simulated MSRE Fuel36

8.3 In-Line and Other Support Analyses for Circulating NaF-NaBF4 Coolant37

8.4 Studies on the Electroreduction of Uranium(IV) in Molten LiF-BeF2-ZrF442

8.5 Electroanalytical Studies of Tellurium in Molten LiF-BeF2 -ZrF4

(65.6-29.4-5.0 mole %)43

8.6 Electroanalytical Studies of Bismuth in Molten LiF-BeF2-ZrF4

(65.6-29.4-5.0-mole %)43

8.7 Electroanalytical Studies in Molten NaBF444

8.8 Spectrophotometric Research45

8.9 Spectral Studies of f-d and f-f Transitions of Pa(IV) in Molten LiF-BeF2-ThF445

8.10 Spectrophotometric Developments for Improved Analytical Methods for Fluoroborate

Coolant Systems46

9. INORGANIC AND PHYSICAL CHEMISTRY47

9.1 The Equilibrium of Dilute UF3 Solutions Contained in Graphite47

9.2 Effects of Oxygen on the UF3 /UF4 Equilibrium48

9.3 Porous Electrode Studies49

9.4 Formation Free Energies and Activity Coefficients in Fuel Salt Mixtures51

9.5 The Chemistry and Thermodynamics of Molten-Salt Reactor Fuels51

9.6 Oxide Chemistry of Niobium(V) in Molten LiF-BeF2 Mixtures53

PART 3. MATERIALS DEVELOPMENT

10. DEVELOPMENT OF MODIFIED HASTELLOY N57

10.1 Procurement of New Test Materials57

10.2 Weldability of Commercial Alloys of Modified Hastelloy N57

10.3 Mechanical Properties of Modified Hastelloy N61

10.4 Transmission Electron Microscopy of Ti-Modified Hastelloy N Alloys62

10.5 Salt Corrosion Studies69

10.5.1 Fuel Salt Thermal Convection Loop Results69

10.5.2 Coolant Salt Thermal Convection Loop Results74

10.5.3 Blanket Salt Thermal Convection Loop Results75

10.5.4 Status of Thermal Convection Loop Program with Fuel and Coolant Salts75

10.5.5 Forced Circulation Loop Results75

10.5.6 Surveillance Specimens from the Coolant-Salt Technology Facility77

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