NE421 Introduction to Nuclear Criticality Safety

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Homework#4

1. Work problem 3-1 from the Lecture 3 PowerPoint slides.
2. Work problem 3-2 from the Lecture 3 PowerPoint slides.
3. Using Oktoc, find the delta (assumed the same for all surfaces) for U metal using a sphere and an H/D=1 cylinder.
That is:
• Find the radius of a bare sphere of U-235 that gives k-effective=1.000+/-0.001
• Find the radius of a bare cylinder of U235 that gives the same k-effective
• Find the value of delta that would give them both the same buckling.

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