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4.2.1 Rod-Drop Experiments38

4.2.2 Reactivity Effect of Excess Uranium40

4.2.3 Summary of Rod-Calibration Information41

4.3 Calculations of Reactivity Variations from Power-Time Records43

4.4 Theoretical Analysis of Dynamics with 233U Fuel45

PART 2. MSBR DESIGN AND DEVELOPMENT

5. DESIGN49

5.1 General49

5.2 Plant Layout49

5.3 Reactor52

5.4 Primary Heat Exchangers57

5.5 Steam Generator and Superheater57

5.6 Steam Reheater59

5.7 Removal of Reactor Afterheat59

5.7.1 Introduction59

5.7.2 Sources of Afterheat59

5.7.3 Heat-Removal Systems60

5.8 Distribution of Noble-Metal Fission Products and Their Decay Heat62

5.9 Reactor Temperatures, Flows, and Heat Transfer64

5.9.1 Reactor Core64

5.9.2 Flow and Temperature in Radial Reflector67

5.9.3 Flow and Temperature in Axial Reflectors69

5.9.4 Vessel Temperatures70

5.10 Estimated Costs of 1000 MWe MSBR Power Station70

5.11 MSBE Design71

5.11.1 Introduction71

5.11.2 Description of Reactor Plant74

6. REACTOR PHYSICS76

6.1 Physics Analysis of MSBR76

6.1.1 Optimization of the MSBR76

6.1.2 The One-Fluid MSBR Reference Design77

6.1.3 Nuclear Design Studies77

6.1.4 Optimum Thorium Concentration in MSBR80

6.1.5 Improvements in Computational Tools82

6.1.6 Gamma and Neutron Heating in MSBR83

6.2 Physics Analysis of MSBE84

6.2.1 MSBE Design Studies84

6.3 MSBR Experimental Physics87

6.3.1 Initial Results of the Experiment to Measure alpha(235U) in the MSRE87

7. SYSTEMS AND COMPONENTS DEVELOPMENT90

7.1 Off-Gas System90

7.1.1 Volume Holdup Tank90

7.2 Noble-Gas Migration in the MSBR92

7.2.1 Contribution of the Noble Gases to Afterheat in the Graphite92

7.2.2 Distribution of Decay Heat in the MSBR Off-Gas System94

7.3 Bubble Generator95

7.4 Bubble Separator96

7.5 Molten-Salt Steam Generator Test Stand98

7.6 Sodium Fluoroborate Circulating Test Loop98

7.6.1 Pumping Characteristics of Sodium Fluoroborate Salt100

7.6.2 Control of Salt Composition100

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