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Accession Number NUREG/CR-7115
Title Performance of Metal and Polymeric O-Ring Seals in Beyond-Design-Basis Temperature Excursions.
Publication Date Apr 2012
Media Count 73p
Personal Author E. J. Hnetkovsky J. C. Yang
Abstract This report documents the beyond-design-basis thermal exposure test results of the performance of one type of metallic seal and two different polymeric compound (ethylene-propylene and polytetrafluoroethylene) seal designs typically used in spent fuel transportation packages. Fifteen tests were conducted using a small scale-model package made of stainless steel SS 304 filled with helium initially pressurized at either 5 bar or 2 bar at room temperature. The test package was then exposed in an electric furnace to temperatures equal to or over the specified maximum operating temperatures of these seals for a pre-determined period (typically 9 h). The pressure drop technique was used to determine if leakage occurred during thermal exposure. A total of fifteen tests, twelve used metallic seals, two used ethylene-propylene compound, and one used polytetrafluoroethylene, were performed. Leakage was observed in some of the thermal exposure tests. The time when leakage occurred varied. The overall goal of the project is to provide insights to the performance of these seals when exposed to beyond-design-basis temperature conditions that could result due to a severe fire.
Keywords Design
Fuel assemblies
O-ring seals
Polymeric compounds
Pressure drop
Spent fuels
Stainless steel
Temperature conditions
Thermal analysis

Source Agency Nuclear Regulatory Commission
NTIS Subject Category 71B - Adhesives & Sealants
99C - Polymer Chemistry
77I - Reactor Fuels & Fuel Processing
Corporate Author National Inst. of Standards and Technology (EL), Gaithersburg, MD. Engineering Lab.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1226
Contract Number N/A

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