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EJAM2-1AA_SP1_"Pipe wall thinning management at Electricité de France (EDF)"
 
Vol.1 No.4 previous GA 11 - 12 - AA SP1 (11 - 12 - 13 - 14) - NT 19 - 20 - 21 - 22 next Vol.2 No.2
Academic Articles
Invited Paper Vol.2 (2010) p.1 - p.13
Special Issue 1: "The Technology of Pipe-wall-thinning Management"
 

Pipe wall thinning management at Electricité de France (EDF)
 
Thomas KNOOK1, Matthieu PERSOZ1, Stéphane TREVIN1, Séverine FRIOL1, Marie-Pierre MOUTRILLE1, Lionel DEJOUX2
 
1 Electricité de France – DPIH/DTG/C2M - FAC specialty Group, 21 Avenue de l’Europe, 38040 Grenoble, France
2 Electricité de France – DPN/UNIE/GMAP - Maintenance Group, 1 Place Pleyel, 93282 Saint-Denis Cedex, France
 
Abstract
Among the various degradation modes that cause pipe wall thinning in the secondary system of Nuclear Power Plants (Corrosion, Galvanic Corrosion, Environmental Corrosion, Flow Accelerated Corrosion, Cavitation, Droplet impingement, Erosion and Abrasion), FAC is the one that is the more widespread in the installation and that requires constant efforts to fight. The wall thickness loss due to FAC can effectively occur in any carbon steel piping containing hot water or wet steam and can lead to pipe ruptures with dramatic consequences.

Electricité de France operates 58 Pressurized Water Reactors that were put in service between 1977 and 1997. The degradations and leaks due to FAC that EDF has experienced and the numerous accidents that have been reported abroad, lead EDF to develop a global strategy to control FAC on piping and to prevent any dramatic rupture. This global strategy is based on a National Maintenance Rule which has been written by the corporate engineering level of EDF called “RNM” and applied by every Nuclear Power Plant operator of the EDF fleet. The RNM is mainly based on the use of the FAC-prediction software "BRT-CICERO™" as well as on specific actions for the lines or elements that are not modeled in the software.
 
Keywords
Flow Accelerated Corrosion, FAC, Degradation mode, Piping, Carbon steel, Maintenance, Prediction software, BRT-CICERO™, Non Destructive Examination, TOFD, Computed Radiography, Chromium.
 
Full Text: PDF
 
(Received: March 16th, 2010)