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ORNL-4622

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending August 31, 1970

INTRODUCTION

SUMMARY

PART 1. MOLTEN-SALT REACTOR EXPERIMENT

1. MSRE OPERATIONS1

1.1 Chronological Account1

1.2 Operations Analysis2

1.2.1 Gamma Spectrometry2

1.2.2 Noble-Metal Migration2

1.2.3 Radiation Heating4

1.2.4 Fluorine Evolution from Frozen Salt4

2. COMPONENT DEVELOPMENT6

2.1 Freeze-Flange Thermal Cycle Test6

2.2 Pumps6

2.2.1 Mark 2 Fuel Pump6

2.2.2 Oil Pump Endurance Test6

PART 2. MSBR DESIGN AND DEVELOPMENT

3. DESIGN8

3.1 Single-Fluid 1000-MW(e) MSBR Design Study Report8

3.2 Molten-Salt Demonstration Reactor Design Study8

3.2.1 Introduction8

3.2.2 General Description9

3.2.3 Buildings and Containment9

3.2.4 Reactor16

3.2.5 Primary Heat Exchangers18

3.2.6 Primary Drain Tanks18

3.2.7 Fuel Salt Storage Tank21

3.2.8 Discard Salt Storage Tanks22

3.2.9 Steam System24

3.3 Afterheat Temperatures in Empty MSBR Heat Exchangers24

3.4 Industrial Study of 1000-MW(e) Molten-Salt Breeder Reactor25

4. REACTOR PHYSICS26

4.1 Physics Analysis of MSBR26

4.1.1 Fixed-Moderator Molten-Salt Reactor26

4.2 MSR Experimental Physics31

4.2.1 233U Capture-to-Absorption Ratio in the Fuel of the MSRE31

5. SYSTEMS AND COMPONENTS DEVELOPMENT35

5.1 Gaseous Fission Product Removal35

5.1.1 Gas Separator35

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