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MOLTEN-SALT REACTOR PROGRAM - page 56 / 122

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6.7 Thermal Convection Loops115

6.8 Evaluation of MSRE Radiator Tubing Contaminated with Aluminum116

7. CHEMISTRY118

7.1 Chemistry of the MSRE118

Fuel Salt Composition and Purity118

MSRE Fuel Circuit Corrosion120

Extent of UF4 Reduction During MSRE Fuel Preparation121

Adjustment of the UF3 Concentration in the MSRE Fuel Salt123

7.2 Fission Product Behavior in the MSRE124

Long-Term Surveillance Specimens125

Uranium Analyses of Graphite Specimens128

Fuel Salt Samples130

Effect of Operating Conditions131

Effect of Beryllium Additions131

Pump Bowl Volatilization and Plating Tests134

Uranium on Pump Bowl Metal Specimens138

Freeze Valve Capsule Experiments138

Special Pump Bowl Tests141

General Discussion of Fission Product Behavior142

7.3 Physical Chemistry of Fluoride Melts144

The Oxide Chemistry of LiF-BeF2-ZrF4 Mixtures144

Solubilities of SmF3 and NdF3 in Molten LiF-BeF2 (66-34 mole %)144

Possible MSBR Blanket-Salt Mixtures146

7.4 Separations in Molten Fluorides149

Removal of Rare Earths from Molten Fluorides by Precipitation on Solid UF3149

Extraction of Protactinium from Molten Fluorides into Molten Metals150

Extraction of Rare Earths from Molten Fluorides into Molten Metals152

Protactinium Studies in the High-Alpha Molten-Salt Laboratory153

Preliminary Study of the System LiF-ThF4-PaF4155

7.5 Development and Evaluation of Analytical Methods for Molten-Salt Reactors156

Determinations of Oxide in MSRE Salts156

Determination of U3/U4 Ratios in Radioactive Fuel by a Hydrogen Reduction Method158

EMF Measurements on the Nickel-Nickel(II) Couple in Molten Fluorides162

Studies of the Anodic Uranium Wave in Molten LiF-BeF-ZrF4163

Spectrophotometric Studies of Molten-Salt Reactor Fuels163

7.6 Analytical Chemistry Analyses of Radioactive MSRE Fuels164

Sample Analyses165

Quality Control Program165

8. MOLTEN-SALT CONVECTION LOOPS IN THE ORR167

8.1 Objectives and Description167

8.2 First Loop Experiment168

In-Pile Irradiation Assembly168

Operations168

Chemical Analysis of Salt168

Corrosion169

Fission Products169

Nuclear Heat and Neutron Flux169

Hot-Cell Examination of Components169

8.3 Evaluation of System Performance171

Heaters171

Coolers171

Temperature Control171

Sampling and Addition171

Salt Circulation172

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