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ORNL-4037

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending August 31, 1966

SUMMARYiii

INTRODUCTION1

Part 1. MOLTEN-SALT REACTOR EXPERIMENT

1. MSRE OPERATIONS AND ANALYSIS7

1.1 Chronological Account of Operations and Maintenance7

1.2 Reactivity Balance10

Reactivity Balances at Power11

Reactivity Balances at Low Power12

1.3 Xenon Poisoning13

Predicted Steady-State 135Xe Poisoning14

Analysis of Transient 135Xe Poisoning16

1.4 Circulating Bubbles22

1.5 Salt Transport24

Gradual Transfer to Overflow Tank24

Overfill24

1.6 Power Measurements25

Heat Balance25

Nuclear Instruments26

Radiator Air Flow26

1.7 Radiation Heating27

Fuel-Pump Tank27

Reactor Vessel28

Thermal Shield29

1.8 Reactor Dynamics29

1.9 Equipment Performance35

Heat Transfer35

Main Blowers39

Radiator Enclosure41

Fuel Off-Gas System43

Treated Cooling-Water System47

Component-Cooling System48

Salt-Pump Oil Systems50

Electrical System51

Control Rods and Drives53

Samplers53

Containment54

Shielding and Radiation56

1.10 Instrumentation and Controls57

Operating Experience --- Process and Nuclear Instruments58

Data System59

Control-System Design61

2. COMPONENT DEVELOPMENT65

2.1 Freeze Valves65

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