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Analytical Results55

2.8 Migration of Short-Lived Gaseous Products into the Graphite56

2.9 Remote Maintenance59

Summary of Remote Maintenance Tasks Performed60

Radiation Levels61

Contamination63

Conclusion63

3. PUMP DEVELOPMENT64

3.1 MSRE Pumps64

Molten-Salt Pump Operation in the Prototype Pump Test Facility64

MK-2 Fuel Pump64

Stress Tests of Pump Tank Discharge-Nozzle Attachment65

Spare Rotary Elements for MSRE Fuel and Coolant Salt Pumps65

Lubrication System66

3.2 Other Molten-Salt Pumps66

Fuel-Pump High-Temperature Endurance Test Facility66

4. INSTRUMENT DESIGN AND DEVELOPMENT67

4.1 Instrumentation and Controls Design67

Off-Gas Sampler Design67

Control System Design68

4.2 MSRE Operating Experience71

Control System Relays71

Temperature Scanner System71

Valves71

Nuclear Instrumentation71

Electronic Switches72

Thermocouples72

Coolant-Pump Radiation Monitor72

Safety System72

4.3 Data System73

4.4 Instrument Development75

Performance – General75

Temperature Scanner75

High-Temperature NaK-Filled Differential Pressure Transmitter76

Ultrasonic Level Probe76

MSRE Fuel Distillation System Level Probe76

Bell-Float-Type Level Indicator for the Mark II Pump76

5. MSRE REACTOR ANALYSIS79

5.1 Neutron Reaction Rates in the MSRE Spectrum79

5.2 Isotopic Changes and Associated Long-Term Reactivity Effects During Reactor Operation83

5.3 Analysis of Transient 135Xe Poisoning86

PART 2. MATERIALS STUDIES

6. MOLTEN-SALT REACTOR PROGRAM MATERIALS95

6.1 MSRE Surveillance Program - Hastelloy N95

6.2 Mechanical Properties of Hastelloy N103

6.3 Precursors of MSBR Graphite108

6.4 Graphite Irradiations110

6.5 Brazing of Graphite111

Large Graphite-to-Hastelloy-N Assemblies111

6.6 Corrosion Resistance of Graphite-to-Metal Brazed Joints111

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