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ORNL-3369

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending August 31, 1962

SUMMARYiii

PART 1. MSRE DESIGN, ENGINEERING ANALYSIS, AND COMPONENT DEVELOPMENT

1. MSRE DESIGN3

Design Status3

Reactor Procurement and Installation4

Major Modifications to Building 75034

Construction Outside Building 75037

Procurement of Materials7

Fabrication of Components8

Reactor Instrumentation and Control Systems14

Layout of Instrumentation and Control System14

Design Status14

Procurement Status16

2. MSRE REACTOR ANALYSIS17

Nuclear Accident Analyses17

Calculational Procedures17

Results of Fuel Pump Power Failure Analysis17

Effects of Cold-Slug Accidents19

Results for Filling Accidents21

Effect of Uncontrolled Withdrawal of Rods21

Effect of Graphite Movement21

Results of Concentrated Fuel Addition22

Reactor Statics Calculations22

Criticality Calculations24

Flux Distributions24

Power Density24

Steady-State Fuel and Graphite Temperatures27

Temperature Distributions27

Average Temperatures29

Reactivity Coefficients33

Temperature Coefficients33

Power Coefficient34

Effective Delayed-Neutron Fractions35

Reactor Kinetics Code Development37

3. COMPONENT DEVELOPMENT41

Freeze-Flange Development41

Freeze-Flange-Seal Test41

Thermal-Cycle Test Loop43

Freeze Test in Thermal-Cycle Test Loop46

Test of a Freeze Flange in the Prototype-Fuel-Pump Testing Facility46

MSRE Control Rod46

Heater Tests46

Pipe Heaters46

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