The Three-Dimensional Time and Volume Averaged Conservation Equations of Two-Phase Flow.- I. Introduction.- II. Spatial Averaging.- III. Conservation Equations.- IV. Time-Averaging.- V. Interfacial Jump Conditions.- VI. Transformed Equations.- VII. Closure and Constitutive Equations.- VIII. One-Dimensional Conservation Equations.- IX. System Classification.- X. Drift-Flux Techniques.- XI. Mixture Models.- References.- Nomenclature.- Light Water Reactor Fuel Cycle Optimization: Theory Versus Practice.- I. Introduction.- II. LWR Fuel Cycle Optimization Theory.- III. LWR Core Reload Design Practice.- IV. Theory Versus Practice.- References.- The Integral Fast Reactor.- I. Introduction.- II. Design Goals for the Next Generation Nuclear Power.- III. Passive Inherent Safety.- IV. Fuel Cycle Closure.- V. Plant Capital Cost.- VI. Operability and Reliability.- VII. Technology Development Status.- VIII. Future Development Path.- References.- Indoor Radon.- I. Introduction.- II. Terminology of the Radon Problem.- III. Radon Sources, Measurements, and Levels.- IV. Lung Dosimetry Models.- V. Risk Estimation Methods.- VI. Cancer Rates and Radon Exposure.- VII. Comparison of Radon Doses with Doses From Other Sources.- VIII. Summary and Discussion.- References.