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ORNL-4191

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending August 31, 1967

INTRODUCTION1

SUMMARY3

PART I. MOLTEN-SALT REACTOR EXPERIMENT

1. MSRE OPERATIONS13

1.1 Chronological Account of Operations and Maintenance13

1.2 Reactivity Balance19

Balances at Power19

Balances at Zero Power21

1.3 Thermal Effects of Operation22

Radiation Heating22

Thermal Cycle History22

Temperature Measurement22

Fuel Salt Afterheat24

1.4 Equipment Performance25

Heat Transfer25

Main Blowers26

Radiator Enclosure26

Off-Gas Systems27

Cooling Water Systems29

Component Cooling System29

Salt Pump Oil Systems30

Electrical System31

Heaters31

Control Rods and Drives31

Salt Samplers31

Containment33

2. COMPONENT DEVELOPMENT36

2.1 Off-Gas Sampler36

2.2 Remote Maintenance36

Preparations for Shutdown After Run 1136

Evaluation of Remote Maintenance After Run 1137

Repair of Sampler-Enricher and Recovery of Latch37

2.3 Decontamination Studies40

2.4 Development of a Scanning Device for Measuring the Radiation Level of Remote Sources40

Experiment with a 5-curie 137Cs Gamma Source41

Gamma Scan of the MSRE Heat Exchanger43

Gamma Energy Spectrum Scan of the MSRE Heat Exchanger43

2.5 Pumps45

Mark-2 Fuel Pump45

Spare Rotary Elements for MSRE Fuel and Coolant Salt Pumps45

Stress Tests of Pump Tank Discharge Nozzle Attachment46

MSRE Oil Pumps46

Oil Pump Endurance Test46

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