Ageing of HELICOFLEX®metallic gasket for spent fuel cask: results of sealing performances of a 100,000h campaign

Year
2016
Author(s)
Masumi Wataru - Central Research Institute of Electric Power Industry
Koji Shirai - Central Research Institute of Electric Power Industry
A. Béziat - CEA, DEN, SDTC, Laboratoire d’Etanchéité, 30207, Bagnols Sur Cèze France
F. Ledrappier - TECHNETICS Group France Laboratoire d’Etanchéité
K. Vulliez - CEA, DEN, SDTC, Laboratoire d’Etanchéité, 30207, Bagnols Sur Cèze France.
B. Deschamps - TECHNETICS
J.F. Juliaa - TECHNETICS Group France, Laboratoire d’Etanchéité, 2 rue James Watt 26700 Pierrelatte.
L. Mirabel - CEA, DEN, SDTC, Laboratoire d’Etanchéité, 30207, Bagnols Sur Cèze France
H.P. Winkler - Gesellschaft für Nuklear-Service mbH, Essen, Germany
R. Hüggenberg - Gesellschaft für Nuklear-Service mbH, Essen, Germany
File Attachment
F5026.pdf927.93 KB
Abstract
In the framework of CEA, the TECHNETICS GROUP France, GNS and CRIEPI are collaborating on an experimental program to assess the long-term use of HELICOFLEX® metallic seals in spent nuclear fuel storage casks. The harvested data on more than 60 mockups after 100,000h of ageing provide a consistent database to extrapolate the long-term sealing performances. After a description of the HELICOFLEX® gasket and of the test program, the results of the entire measurement campaign are discussed to interpret them from a statistical point of view. This paper then focuses on two methods based on a time-temperature equivalence Larson & Miller Parameter and a time extrapolation.