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ORNL-4728

MOLTEN-SALT REACTOR PROGRAM

SEMIANNUAL PROGRESS REPORT

For Period Ending August 31, 1971

Contents

PART 1. MSBR DESIGN AND DEVELOPMENT

1. DESIGN2

1.1 Molten-Salt Demonstration Reactor Design Study2

1.1.1 General2

1.1.2 Reactor Core3

1.1.3 MSDR Off-Gas and Salt Pump-Back System4

1.1.4 Drain Tank Cooling System7

1.1.5 Drain Valve Cell9

1.1.6 Drain Cell Catch Pan9

1.2 Some Consequences of Tubing Failure in the MSBR Heat Exchanger9

1.3 Side-Stream Processing of the MSBR Primary Flow for Xenon and/or Iodine Removal10

1.4 MSBE Design11

1.4.1 Reactor Core Power and Neutron Flux Distribution11

1.4.2 Reactor Core Heat Removal11

1.4.3 Maintenance Studies14

1.5 MSBR Industrial Design Study15

2. REACTOR PHYSICS16

2.1 MSR Experimental Physics16

2.1.1 HTLTR Lattice Experiments16

2.2 Physics Analysis of MSBR18

2.2.1 Neutron Irradiation Effects Outside the MSBR Core18

2.2.2 MSBE Nuclear Characteristics20

2.2.3 Fixed-Moderator Molten-Salt Reactor21

3. SYSTEMS AND COMPONENTS DEVELOPMENT26

3.1 Gaseous Fission Product Removal26

3.1.1 Gas Separator and Bubble Generator26

3.1.2 Bubble Formation and Coalescence Test27

3.2 Gas System Test Facility27

3.3 Off-Gas Systems28

3.3.1 Off-Gas System for Molten-Salt Reactors28

3.3.2 Computer Design of Charcoal Beds for MSR Off-Gas Systems29

3.4 Molten-Salt Steam Generator29

3.4.1 Steam Generator Industrial Program29

3.4.2 Molten-Salt Steam Generator Technology Facility29

3.4.3 Molten-Salt Steam Generator Test Proposals30

3.5 Sodium Fluoroborate Test Loop31

3.5.1 Inspection of PKP Pump Rotary Element31

3.6 Coolant-Salt Technology Facility34

3.7 MSBR Pumps35

3.7.1 Salt Pumps for MSRP Technology Facilities35

3.7.2 ALPHA Pump35

3.7.3 Drain Tank Jet Pump System for MSDR36

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