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ORNL-4548

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending February 28, 1970

INTRODUCTIONxi

SUMMARYxiii

PART 1. MOLTEN-SALT REACTOR EXPERIMENT

1. MSRE OPERATIONS1

1.1 Chronological Account of Operations and Maintenance1

1.2 Operations Analysis5

1.2.1 Reactivity Balance5

1.2.2 Xenon Poisoning6

1.2.3 Dynamics Testing7

1.2.4 Operational Diagnosis by Noise Analysis7

1.2.5 Tritium9

1.2.6 Fission Product Distribution in the Fuel System11

1.2.7 Graphite Samples Exposed in Fuel Pump13

1.2.8 Evaluation of Leak in Primary System14

1.2.9 Salt Transfer to the Overflow Tank14

1.2.10 Radiation Heating15

1.2.11 System Heat Balance15

1.2.12 Heat Transfer in Primary Heat Exchanger17

1.2.13 Thermal Cycle History17

1.3 Equipment18

1.3.1 Salt Samplers18

1.3.2 Control Rods and Drives20

1.3.3 Off-Gas Systems20

1.3.4 Component Cooling System22

1.3.5 Containment and Ventilation22

1.3.6 Heaters and Electrical System22

1.3.7 Oil Systems for Salt Pumps23

1.3.8 Radiator and Main Blowers23

1.4 Remote Maintenance23

1.5 Final Shutdown and Standby Status24

1.6 Preparations for Inspection25

2. REACTOR ANALYSIS26

2.1 Introduction26

2.2 Extensions of MSRE Core Physics Calculations to the Use of XSDRN-CITATION Programs26

2.3 Evaluation of Long-Term Reactivity Behavior During Operation with 235U30

3. COMPONENT DEVELOPMENT34

3.1 Freeze-Flange Thermal-Cycle Test34

3.1.1 Facility Operation Problems34

3.1.2 Inspection of the Flanges34

3.2 Pumps35

3.2.1 Mark 2 Fuel Pump35

3.2.2 Oil Pump Endurance Test36

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