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ORNL-4449

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending August 31, 1969

INTRODUCTIONix

SUMMARYxi

PART 1. MOLTEN-SALT REACTOR EXPERIMENT

1. MSRE OPERATIONS1

1.1 Chronological Account of Operations and Maintenance1

1.2 Operations Analysis4

1.2.1 Reactivity Balance4

1.2.2 Reactivity Effects of Graphite Distortion5

1.2.3 Gas in the Fuel System6

1.2.4 Diagnosis by Noise Analysis10

1.2.5 Fission Product Distributions in Fuel System11

1.2.6 Salt Transfer to Overflow Tank12

1.2.7 Coolant Salt Flow Rate12

1.2.8 Radiation Heating13

1.2.9 Service Life13

1.2.10 Heat Transfer14

1.3 Equipment14

1.3.1 New Irradiation-Specimen Array for Core14

1.3.2 Salt Samplers15

1.3.3 Control Rods and Drives16

1.3.4 Off-Gas System17

1.3.5 Component Cooling System19

1.3.6 Containment and Ventilation19

1.3.7 Heaters and Electrical System19

1.3.8 Oil Systems for Salt Pumps20

1.3.9 Radiator and Main Blowers20

1.4 Remote Maintenance20

2. MSRE REACTOR ANALYSIS22

2.1 Introduction22

2.2 Definition of Average Reaction Cross Sections22

2.3 Results of Revised Cross-Section Calculations23

2.4 Effects on Other MSRE Neutronic Characteristics25

3. COMPONENT DEVELOPMENT27

3.1 Freeze-Flange Thermal-Cycle Test27

3.1.1 Facility Operation Problems27

3.1.2 Inspection of the Flanges27

3.2 Pumps29

3.2.1 Mark 2 Fuel Pump29

3.2.2 Oil Pump Endurance Test31

3.3 MSRE Remote Gamma Spectrometer31

3.3.1 Description of the Equipment31

3.3.2 Test Program33

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