Effect of Lead Shielding on Small Cask Criticalityby Alan H. Wells,
Document Type: Proceeding Paper
Part of: High Level Radioactive Waste Management 1993
A study was performed to evaluate gamma shield effects on criticality safety for two modern legal weight truck casks. The lead gamma shield of a small spent fuel shipping cask increases k-effective compared to other shielding materials, such as depleted uranium. Geometric approximates used to model the shield region of lead-shielded casks can result in unconservative calculations which underpredict k-effective by as much as 0.05. Calculations were performed on personal computers using the KENO-V.a computer code, using the Hansen-Roach 16 energy group and ENDF-B/IV 27 group cross-section sets. Verification calculations were performed with the MCNP code using ENDF-B/V cross-sections.
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