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MOLTEN-SALT REACTOR PROGRAM - page 115 / 122

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5.2.2 Metal Boride Formation50

5.2.3 Corrosion of Nickel51

6. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS52

6.1 In-line Analysis of Molten MSBR Fuel52

6.2 Electroanalytical Studies of Bismuth in Molten LiF-BeF2 -ZrF456

6.3 Electroanalytical Studies in Molten NaBF4-NaF57

PART 3. MATERIALS DEVELOPMENT

7. DEVELOPMENT OF MODIFIED HASTELLOY N60

7.1 Procurement and Fabrication of Experimental Alloys60

7.1.1 Production Heats60

7.1.2 Semiproduction Heats63

7.1.3 Laboratory Heats66

7.2 Weldability of Commercial Alloys of Modified Hastelloy N68

7.3 Stability of Various Titanium-Modified Hastelloy N Alloys71

7.4 Mechanical Properties of Titanium-Modified Hastelloy N Alloys in the Unirradiated Condition73

7.5 Postirradiation Mechanical Properties of Modified Hastelloy N79

7.6 Microstructural Analysis of Titanium-Modified Hastelloy N83

7.6.1 Microstructure of Aged 503 and 114 Alloys83

7.6.2 X-Ray Analysis of Precipitates84

7.6.3 Irradiation and Creep Testing84

7.6.4 Microstructure of Irradiated 503 and 114 Alloys85

7.7 Salt Corrosion Studies90

7.7.1 Status of Thermal-Convection Loop Program90

7.7.2 Fuel Salt Thermal-Convection Loop Results91

7.7.3 Forced-Circulation Loop Results91

7.7.4 Coolant-Salt Technology Facility Results94

7.7.5 Static Pot Tests94

7.8 Corrosion of Hastelloy N and Other Alloys in Steam94

7.9 Development of a Tellurium-Delivery System for a Representative Tellurium-Corrosion

Screening Test Method102

7.10 Reactions of Tellurium with Nickel at Low Tellurium Activities102

7.11 Surface- and Grain-Boundary Studies Related to Hastelloy N Grain-Boundary Embrittlement104

7.11.1 Development of Improved Techniques104

7.11.2 High Temperature Studies of the Behavior of Tellurium in and on

Experimental Alloys104

7.12 Identification of Reaction Layers on Hastelloy N Exposed to Nickel Tellurides105

7.12.1 Metallographic Examination105

7.12.2 Electron Microprobe Analysis105

7.12.3 X-Ray Diffraction Analysis109

7.12.4 Conclusions109

7.13 Examination of Hastelloy N Specimens Exposed to Tellurium109

7.14 Operation and Analysis of TeGen-1119

7.14.1 Operating History of TeGen-1119

7.14.2 Data Analysis for TeGen-1119

7.14.3 Future Irradiations123

7.15 Examination of TeGen-1123

8. FUEL PROCESSING MATERIALS DEVELOPMENT137

8.1 Static Capsule Tests of Graphite with Bismuth and Bismuth-Lithium Solutions137

8.2 Thermal Convection Loop Tests140

8.3 Tests of Oxidation-Resistant Coatings on Mild Steel Pipe141

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