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Part 2. MATERIALS STUDIES

4. METALLURGY63

Reaction of INOR-8 with Impure Nitrogen63

Alteration of MSRE Heat Exchanger Tube Bundle64

INOR-8 Welding Studies67

Mechanical Properties of INOR-8 Weld Metal67

INOR-8 Welding Microstructure Study71

Graphite-to-Metal Joining Development73

Transition Joints73

Brazing Alloy Development75

Evaluation of MSRE Graphite76

Oxygen Contamination of the MSRE Core Bars and Lattice Bars76

Accessible Voids Content of MSRE Core Graphite77

Metallographic Examination of Bayonet Tube in Drain Tank Cooler Test80

Mechanical Properties of Irradiated INOR-882

MSRE Materials Surveillance Testing83

Control Test for Surveillance Specimen84

5. RADIATION CHEMISTRY87

Introduction87

Experiment MTR-47-587

Graphite89

INOR-897

Fuel Salt99

Summary of MTR-47-5 Postirradiation Examinations102

Experiment MTR-47-6102

Objectives102

Experimental103

Results and Discussion107

Summary of Experiment MTR-47-6119

6. CHEMISTRY121

High-Temperature Fluoride Phase Equilibrium Studies121

Fuel System for the Molten-Salt Reactor Experiment121

Reactions in Molten Salt Systems129

HF-H2O Equilibrium with Molten Fluorides129

Advantages of On-Stream HF-H2 Sparging of MSR Fuels136

The Stability of UF3138

Viscosity in the LiF-BeF2 System144

Fuel, Coolant, and Flush Salts for the MSRE146

The Production Process147

Coolant and Flush Salt Mixtures147

Component Mixtures for the MSRE Fuel148

Chemistry of Pre-nuclear Use of Fuel and Flushing Salts in the MSRE150

Compositional Analysis of MSRE Salts150

Chemical Analyses of Fuel and Circuit Salts During Pre-nuclear Tests of the MSRE152

Development and Evaluation of Equipment for Analyzing Radioactive MSRE Fuel Samples155

Sample Preparation155

Sample Analyses156

Development and Evaluation of Methods for the Analysis of the MSRE Fuel160

Oxide160

Reducing Power163

Electrochemical Analyses164

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