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ORNL-4119

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending February 28, 1967

SUMMARY1

INTRODUCTION9

PART 1. MOLTEN-SALT REACTOR EXPERIMENT

1. MSRE OPERATIONS11

1.1 Chronological Account of Operations and Maintenance11

1.2 Reactivity Balance14

Experience14

Circulating Bubbles17

1.3 Thermal Effects of Operation18

Radiation Heating18

Thermal Cycle History19

1.4 Reactor Dynamics20

1.5 Equipment Performance21

Heat Transfer21

Main Blowers25

Radiator Enclosure26

Off-Gas Systems27

Cooling-Water Systems31

Component-Cooling System32

Salt-Pump Oil Systems34

Electrical System34

Heaters35

Control Rods and Drives36

Samplers36

Containment37

2. COMPONENT DEVELOPMENT39

2.1 Sampler-Enricher39

Contamination39

Capsule Support Wire40

Seal Leakage40

Maintenance40

2.2 Coolant Sampler41

2.3 Fuel Processing Sampler41

2.4 Off-Gas Sampler41

2.5 Off-Gas Filter - Mk II42

2.6 Feltmetal Capacity Test45Assumptions46

Experimental Procedure46

Results47

2.7 Examination of the Mk I Off-Gas Filter47

Pressure Drop Tests48

Disassembly50

Observations50

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