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MOLTEN-SALT REACTOR PROGRAM - page 60 / 122

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PART 3. CHEMISTRY

8. CHEMISTRY OF THE MSRE102

8.1 MSRE Salt Composition and Purity102

Fuel Salt103

Coolant Salt103

Flush Salt103

Implications of Current Experience in Future Operations108

8.2 MSRE Fuel Circuit Corrosion Chemistry110

8.3 Adjustment of the UF3 Concentration of the Fuel Salt110

9. FISSION PRODUCT BEHAVIOR IN THE MSRE116

9.1 Fission Products in MSRE Cover Gas116

9.2 Fission Products in MSRE Fuel119

9.3 Examination of MSRE Surveillance Specimens After 24,000 MW*hr121

Examination of Graphite121

Examination of Hastelloy N124

Fission Product Distribution in MSRE125

9.4 Deposition of Fission Products from MSRE Gas Stream on Metal Specimens128

9.5 Deposition of Fission Products on Graphites in MSRE Pump Bowl131

10. STUDIES WITH LiF-BeF2 MELTS136

10.1 Oxide Chemistry of ThF4-UF4 Melts136

10.2 Containment of Molten Fluorides in Silica137

Chemistry137

Spectrophotometric Measurements with Silica Cells139

10.3 Electrical Conductivity of Molten Fluorides and Fluoroborates140

11. BEHAVIOR OF MOLYBDENUM FLUORIDES142

11.1 Synthesis of Molybdenum Fluorides142

11.2 Reaction of Molybdenum Fluorides with Molten LiF-BeF2 Mixtures143

11.3 Mass Spectrometry of Molybdenum Fluorides144

12. SEPARATION OF FISSION PRODUCTS AND OF PROTACTINIUM FROM

MOLTEN FLUORIDES148

12.1 Extraction of Protactinium from Molten Fluorides into Molten Metals148

12.2 Stability of Protactinium-Bismuth Solutions Contained in Graphite149

12.3 Attempted Electrolytic Deposition of Protactinium151

12.4 Protactinium Studies in the High-Alpha Molten-Salt Laboratory153

Reduction of Iron Dissolved in Molten LiF-ThF4153

Thorium Reduction in the Presence of an Iron Surface (Brillo Process)153

Thorium Reduction Followed by Filtration154

Conclusion154

12.5 MSBR Fuel Reprocessing by Reductive Extraction into Molten Bismuth154

12.6 Reductive Extraction of Cerium from LiF-BeF2 (66-34 Mole %) into Pb-Bi Eutectic Mixture156

13. BEHAVIOR OF BF3 AND FLUOROBORATE MIXTURES158

13.1 Phase Relations in Fluoroborate Systems158

13.2 Dissociation Vapor Pressures in the NaBF4-NaF System159

13.3 Reactions of Fluoroborates with Chromium and Other Hastelloy N Constituents161

Apparent Mass Transfer of Nickel163

13.4 Reaction of BF3 with Chromium Metal at 650°C163

13.5 Compatibility of BF3 with Gulfspin-35 Pump Oil at 150°F164

14. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS FOR

MOLTEN-SALT REACTORS166

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