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ORNL-3812

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending February 28, 1965

SUMMARYiii

INTRODUCTION1

Part 1. MSRE OPERATIONS AND CONSTRUCTION, ENGINEERING

ANALYSIS, AND COMPONENT DEVELOPMENT

1. MSRE OPERATIONS5

Chronological Account5

Component and System Performance6

Heaters and Insulation6

Freeze Flanges7

Freeze Valves8

Reactor Access Nozzle9

Fuel and Coolant Pumps9

Radiator10

Weighing Systems10

Drain Tank Heat Removal Systems11

Thermal Shield Cooling Water11

Helium and Off-Gas Systems11

Operations Analysis12

Behavior of Noble Gas in the Fuel System12

Gas in Circulating Loops14

Overflow from Fuel Pump14

Fuel and Coolant Pump Cool-Down Rates15

Drying Out the Salt Systems15

Instrumentation and Controls Design and Installation17

General17

Reactor Process Instrumentation17

Reactor Nuclear Instrumentation18

Electrical Control Circuits18

Control Panels and Cabinets19

Data System22

Fuel Sampler-Enricher and Chemical Processing System Sampler22

Coolant Salt Sampler22

Personnel and Stack Monitors23

Reliable Instrument Power System23

Remote-Maintenance Closed-Circuit Television23

MSRE Component Fabrication24

Sampling and Enriching Systems24

Vapor-Condensing System25

MSRE Construction and Installation25

Pump Installation25

Heat Exchanger Modification and Installation25

Heater and Electrical Installation26

High-Bay Containment26

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