FUEL CASK IMPACT LIMITER VULNERABILITIES

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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 ... continued below

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Leduc, D; Jeffery England, J & Roy Rothermel, R February 9, 2009.

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Description

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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  • Journal Name: Journal of Packaging, Transport, Storage, and Security of Radioactive Material

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  • Report No.: M-RPT-G-00001
  • Grant Number: DE-AC09-08SR22470
  • Office of Scientific & Technical Information Report Number: 947623
  • Archival Resource Key: ark:/67531/metadc896207

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  • February 9, 2009

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

Description Last Updated

  • Dec. 9, 2016, 11:31 p.m.

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Leduc, D; Jeffery England, J & Roy Rothermel, R. FUEL CASK IMPACT LIMITER VULNERABILITIES, article, February 9, 2009; [Aiken, South Carolina]. (digital.library.unt.edu/ark:/67531/metadc896207/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.