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MOLTEN-SALT REACTOR PROGRAM - page 49 / 122

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2. COMPONENT DEVELOPMENT53

Freeze Valves53

Control Rods53

Control Rod Drive Units54

Radiator Doors54

Radiator Heater Electrical Insulation Failure57

Sampler-Enricher58

Coolant Salt Sampler59

Examination of Components from the MSRE Off-Gas System60

Capillary Flow Restrictor FE 52160

Check Valve CV 53360

Charcoal Bed Inlet Valve HV 62160

Line 522 Pressure Control Valve PCV 52262

Line Filter 52264

Flow Test on the MSRE Filter from Line 52265

Fuel Processing System Sampler65

Off-Gas Sampler67

Xenon Migration in the MSRE69

Remote Maintenance70

Practice Before Operation72

Maintenance of Radioactive Systems72

Pump Development74

MSRE Pumps74

Other Molten-Salt Pumps75

Instrument Development77

Ultrasonic Single-Point Molten-Salt Level Probe77

High-Temperature NaK-Filled Differential-Pressure Transmitter77

Float-Type Molten-Salt Level Transmitter78

Conductivity-Type Single-Point Molten-Salt Level Probe78

Single-Point Temperature Alarm Switches78

Helium Control Valve Trim Replacement79

Thermocouple Development and Testing79

Temperature Scanner80

3. MSRE REACTOR ANALYSIS82

Least-Squares Formula for Control Rod Reactivity82

Spatial Distribution of 135Xe Poisoning in MSRE Graphite87

Part 2. MATERIALS STUDIES

4. METALLURGY95

Dynamic Corrosion Studies95

MSRE Material Surveillance Tests96

Reactor Surveillance Specimens96

Surveillance Control Specimens99

Hot-Cell Metallographic Examination of Hastelloy N from Experiment MTR-47-6

for Evidence of Nitriding100

Postirradiation Metallographic Examination of Capsules 1-4 from Experiment ORNL MTR-47-6101

Development of Graphite-to-Metal Joints101

Tests of Graphite-Molybdenum Brazed Joint for Containing Molten Salts Under Pressure104

New Grades of Graphite107

Evaluation of the Effects of Irradiation on Graphite108

Effects of Irradiation on Hastelloy N111

Weld Studies on Hastelloy N115

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