FUEL CASK IMPACT LIMITER VULNERABILITIES Page: 2 of 10
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M-RPT-G-00001
Fuel Cask Impact Limiter Vulnerabilities
D. Leduc, J. England, R. Rothermel
Abstract
Cylindrical fuel casks often have impact limiters surrounding just the ends of the cask
shaft in a typical "dumbbell" arrangement. The primary purpose of these impact limiters
is to absorb energy to reduce loads on the cask structure during impacts associated with a
severe accident. Impact limiters are also credited in many packages with protecting
closure seals and maintaining lower peak temperatures during fire events. For this credit
to be taken in safety analyses, the impact limiter attachment system must be shown to
retain the impact limiter following Normal Conditions of Transport (NCT) and
Hypothetical Accident Conditions (HAC) impacts. Large casks are often certified by
analysis only because of the costs associated with testing. Therefore, some cask impact
limiter attachment systems have not been tested in real impacts. A recent structural
analysis of the T-3 Spent Fuel Containment Cask found problems with the design of the
impact limiter attachment system. Assumptions in the original Safety Analysis for
Packaging (SARP) concerning the loading in the attachment bolts were found to be
inaccurate in certain drop orientations. This paper documents the lessons learned and
their applicability to impact limiter attachment system designs.
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Leduc, D; Jeffery England, J & Roy Rothermel, R. FUEL CASK IMPACT LIMITER VULNERABILITIES, article, February 9, 2009; [Aiken, South Carolina]. (https://digital.library.unt.edu/ark:/67531/metadc896207/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.