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4. INSTRUMENTATION AND CONTROLS38

4.1 Transient and Control Studies of the MSBR System Using a Hybrid Computer38

4.2 MSRE Design and Operations Report, Part IIB, Nuclear and Process Instrumentation38

4.3 Further Discussion of Instrumentation and Controls Development Needed for the

Molten-Salt Breeder Reactor38

5. HEAT AND MASS TRANSFER AND THERMOPHYSICAL PROPERTIES39

5.1 Heat Transfer39

5.2 Thermophysical Properties41

5.3 Mass Transfer to Circulating Bubbles41

PART 2. CHEMISTRY

6. POSTOPERATIONAL EXAMINATION OF MSRE46

6.1 Examination of Moderator Graphite from MSRE46

6.1.1 Results of Visual Examination46

6.1.2 Segmenting of Graphite Stringer46

6.1.3 Examination of Surface Samples by X-ray Diffraction47

6.1.4 Examination with a Gamma Spectrometer47

6.1.5 Milling of Surface Graphite Samples49

6.1.6 Radiochemical and Chemical Analyses of MSRE Graphite49

6.2 Cesium Isotope Migration in MSRE Graphite51

6.3 Fission Product Concentrations on MSRE Surfaces54

6.4 Metal Transfer in MSRE Salt Circuits55

7. HYDROGEN AND TRITIUM BEHAVIOR IN MOLTEN SALT56

7.1 The Solubility of Hydrogen in Molten 2LiF·BeF256

7.2 Permeation of Metals by Hydrogen57

7.3 Tritium Control in an MSBR59

7.3.1 Mass Spectrometric Examination of Stability of NaBF3OH59

7.3.2 The Thermal Stability of Nitrate-Nitrite Mixtures59

7.4 Dissociating-Gas Heat Transfer Scheme and Tritium Control in Molten-Salt Power Systems60

8. PROCESSING CHEMISTRY62

8.1 The Oxide Chemistry of Pa4+ in Molten LiF-BeF2-ThF462

8.2 The Oxide Chemistry of Pa5+ in Uranium-Containing Molten LiF-BeF2-ThF464

8.3 Reductive Extraction Distributions of Barium and. Thorium Between Bismuth-Lead

Eutectic and Breeder Fuel Solvent67

8.4 Removal of Cerium from Lithium Chloride by Zeolite67

9. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS

FOR MOLTEN SALT REACTORS69

9.1 In-Line Chemical Analysis of Molten Fluoride Salt Streams69

9.2 Slotted Probe for In-Line Spectral Measurements70

9.3 In-Line Determination of Hydrolysis Products in NaBF4 Cover Gas71

9.4 Determination of Hydrogen in Fluoroborate Salts73

9.5 Voltammetric and Electrolysis Studies of Hydroxide Ion in Molten NaBF474

9.6 Electroanalytical Studies in the NaBF4 Coolant Salt75

9.7 Electroanalytical Studies of Ni(II) in Molten Fluoride Fuel Solvent75

10. OTHER FLUORIDE RESEARCHES77

10.1 Absorption Spectroscopy of Molten Fluorides77

10.1.1 The Disproportionation Equilibrium of UF3 Solutions77

10.1.2 Estimation of the Available F- Concentrations in Melts by

Measurement of UF4 Coordination Equilibria77

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