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MOLTEN-SALT REACTOR PROGRAM - page 52 / 122

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2.2 Control Rods65

2.3 Control-Rod Drive Units66

2.4 Radiator Doors67

2.5 Sampler-Enricher70

Replacement of Manipulator Boots70

Replacement of the Capsule Latch71

Repair of an Open Electrical Circuit71

Recovery of a Capsule72

Operational Valve Leakage72

Contamination of Removal Valve Seals72

Miscellaneous Problems73

Changes to the Control Circuit73

2.6 Coolant Sampler73

2.7 Fuel Processing System Sampler74

2.8 Off-Gas Filter Assembly74

Filter Medium74

Heat Dissipation74

Particle Trap75

Charcoal Trap76

2.9 524 Charcoal Bed77

2.10 Remote Maintenance77

3. PUMP DEVELOPMENT81

3.1 MSRE Pumps81

Molten-Salt Pump Operation in the Prototype Pump Test Facility81

Pump Rotary Element Modification82

Lubrication System82

MK-2 Fuel Pump82

3.2 Other Molten-Salt Pumps82

PK-P Fuel-Pump High-Temperature Endurance Test82

Pump Containing a Molten-Salt-Lubricated Journal Bearing82

4. INSTRUMENT DEVELOPMENT84

4.1 Temperature Scanner84

4.2 High-Temperature, NaK-Filled, Differential-Pressure Transmitter85

4.3 Molten-Salt Level Detectors85

4.4 Helium Control Valve Trim Replacement86

5. REACTOR ANALYSIS88

5.1 Analysis of Rod Drop Experiments88

Description of .Experiments88

Analysis Procedures89

Results91

Part 2. MATERIALS STUDIES

6. MSRP MATERIALS97

6.1 MSR Materials Surveillance Testing97

6.2 Evaluation of Possible MSRE Radiator Tubing Contamination with Aluminum103

6.3 Evaluation of Graphite102

6.4 Internal Stress Problem in Graphite Moderator Blocks110

6.5 Brazing of Graphite112

6.6 Corrosion of Graphite-to-Metal Brazed Joints115

6.7 Welding Development of Hastelloy N117

Effect of Irradiation on the Mechanical Properties of Hastelloy N117

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