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MOLTEN-SALT REACTOR PROGRAM - page 27 / 122

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5. IN-PILE TESTS97

5.1 Interaction of Fissioning Fuel with Graphite: Test No. ORNL-MTR-47-397

5.1.1 Description of Experiment97

5.1.2 Dismantling of In-Pile Assembly99

5.1.3 Temperatures100

5.1.4 Gas Analyses100

5.1.5 Test Effects on Graphite105

5.1.6 Analyses of Graphite106

5.1.7 Test Effects on Coupons106

5.1.8 Test Effects on Fuel106

5.1.9 Conclusions110

5.2 MSRE In-Pile Testing110

6. CHEMISTRY114

6.1 Phase-Equilibrium Studies114

6.1.1 The System LiF-BeF2-ZrF4114

6.1.2 The System LiF-BeF2-ZrF4-ThF4-UF4116

6.1.3 Phase Equilibrium Studies in Fluoride Systems116

6.2 Oxide Behavior in Fuels117

6.2.1 Removal of Oxide from a Flush Salt117

6.2.2 The Behavior of Sulfates in Molten Fluorides118

6.3 Physical and Chemical Properties of Molten Salts121

6.4 Graphite Compatibility122

6.4.1 The Behavior of Carbon Tetrafluoride in Molten Fluorides122

6.5 Chemical Aspects of MSRE Safety124

6.5.1 Physical Effects of Mixing Molten Fuel and Water124

6.5.2 Solubility of Fuel-Salt Components in Water127

6.5.3 Solubility of MSRE Coolant in Water129

6.5.4 Partial Freezing of MSRE Fuel130

6.6 Fluoride-Salt Production130

6.6.1 Production Rates130

6.7 Analytical Chemistry131

6.7.1 Oxygen in Nonradioactive MSRE Fuel131

6.7.2 Adaptation of Analytical Methods to Radioactive Fuel132

7. FUEL PROCESSING134

7.1 MSRE Flowsheet132

7.2 Fluorine Disposal Tests, Using Charcoal134

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