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ORNL-3872

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending August 31, 1965

SUMMARYvii

INTRODUCTION1

Part 1. MSRE OPERATIONS AND CONSTRUCTION, ENGINEERING

ANALYSIS, AND COMPONENT DEVELOPMENT

1. MSRE OPERATIONS7

Chronological Account7

Component and System Performance10

Control Rods10

Sampler-Enricher11

Freeze Valves12

Freeze Flanges13

Fuel and Coolant System Pressure Control13

Heaters and Insulation15

Reliable Instrument Power System15

Thermal-Shield Cooling Water16

Fuel-Pump Overflow Tank16

Analysis of Operation16

Basic Nuclear Characteristics16

Dynamic Tests24

Undissolved Gas in Fuel Loop30

Salt Density and Inventory Experience30

External Neutron Source31

Instrumentation and Controls Design and Installation32

General32

Design, Installation, and Checkout32

Instrumentation and Controls System Performance40

Revisions and Modifications43

Documentation46

2. COMPONENT DEVELOPMENT48

Life Tests48

Freeze Valve48

Pipe Heater48

Drain-Tank Heater48

Checkout and Startup of Components48

Control Rods48

Control Rod Drive Units49

Freeze Valves51

Freeze Valves 204 and 20651

Freeze Valve 10351

Freeze Valves 104, 105, and 10653

Noble-Gas Dynamics55

Sampler-Enricher56

Removal Valve and Seal56

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