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MOLTEN-SALT REACTOR PROGRAM - page 2 / 122

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PART 2. MATERIALS STUDIES

2.1. METALLURGY51

Dynamic Corrosion Studies51

Thorium-Bearing Salts in Thermal-Convection Loops51

Uranium-Bearing Salts and Coolant Salts in Thermal-Convection Loops52

Results of Examination of Samples Removed from Forced-Circulation Loop CPR 54

General Corrosion Studies54

Effect of Carburization on Reactor Structural Materials54

Corrosion of Brazing Alloys by Fuel Salts59

Corrosion of INOR-8 Welds by NaK and by Fuel Salts60

Physical Properties of INOR-862

Mechanical Properties of INOR-863

Welding and Brazing Studies64

Metal Seals for Remote-Disconnect Flanged Joints64

Welding of INOR-8 Tubing65

Evaluation Tests for Welds67

Examination of INOR-8 Forced-Circulation Loop That Failed During Initial Heating71

Fabrication of Test Components73

Development of Nondestructive Testing Techniques75

Evaluation of INOR-8 Tubing75

Cladding Thickness Measurements and Bond Inspections77

Inspection Results77

Material Inspection77

Weld Inspection78

Failure Analyses78

2.2. RADIATION DAMAGE79

In-Pile Thermal-Convection Loop Tests79

In-Pile Static Capsule Tests80

2.3. CHEMISTRY81

Phase Equilibrium Studies81

Systems Containing UF4 and/or ThF481

Solubility and Stability of PuF3 in Molten Fluorides88

Fused Chlorides as Secondary Heat Transfer Fluids90

Vapor Pressures of LiF-BeF2 Mixtures91

Fuel Reprocessing91

Solubility of Noble Gases in Molten Fluoride Mixtures91

Solubility of HF in Molten Fluorides93

Solubilities of Fission-Product Fluorides94

Order of Oxide Precipitation in Fluoride Salt Melts97

Chemical Reactions of Oxides with Fluorides in LiF-KF99

Lithium Recovery from NaF-KF-LiF Melts101

Chemistry of the Corrosion Process105

Activity Coefficients of CrF2 in NaF-ZrF4105

Solubility of FeF2 in LiF-BeF2107

Use of 51Cr to Study Chromium Migration in Polythermal Inconel-Molten Salt Systems107

Activity of Nickel in Nickel-Molybdenum Alloys111

Production of Purified Mixtures113

Preparation of Pure Fluorides113

Small-Scale Purification Operations113

Preparation of Material for In-Pile Loop113

Transfer and Service Operations113

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