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ORNL-4254

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending February 29, 1968

INTRODUCTIONix

SUMMARYxi

PART 1. MOLTEN-SALT REACTOR EXPERIMENT

1. MSRE OPERATIONS1

1.1 Chronological Account of Operations and Maintenance1

1.2 Operations Analysis3

1.2.1 Reactivity Balance3

1.2.2 Variations in Reactor Access Nozzle Temperatures7

1.2.3 Radiation Heating9

1.2.4 Thermal Cycle History9

1.2.5 236U Indication of Integrated Power10

1.3 Equipment Performance11

1.3.1 Salt Pumps11

1.3.2 Heat Transfer11

1.3.3 Salt Samplers12

1.3.4 Control Rods and Drives13

1.3.5 Radiator Enclosure13

1.3.6 Off-Gas Systems13

1.3.7 Main Blowers14

1.3.8 Heaters15

1.3.9 Electrical System15

1.3.10 Salt Pump Oil Systems16

1.3.11 Cooling Water System16

1.3.12 Component Cooling Systems17

1.3.13 Containment and Ventilation17

2. COMPONENT DEVELOPMENT19

2.1 Off-Gas Sampler19

2.2 Fuel Sampler-Enricher20

2.3 Decontamination Studies20

2.4 Study of Pin-Hole Camera for Gamma Source Mapping22

2.5 Freeze-Flange Thermal Cycle Tests23

2.6 Pumps29

2.6.1 Mark 2 Fuel Pump29

2.6.2 MSRE Oil Pumps29

2.6.3 Oil Pump Endurance Test29

3. INSTRUMENTS AND CONTROLS30

3.1 MSRE Operating Experience30

3.1.1 Safety System Components30

3.1.2 Thermocouples30

3.1.3 Other Instruments and Controls31

3.2 Control System Design31

3.3 MSRE Neutron Noise Analysis32

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