6. Preventing fatigue damage
6.1 Definition
Unlike previous types of damage, which are global and affect the overall behavior of the structure, fatigue is local damage resulting from strain variations imposed in zones of strain concentration or at the surface of walls subjected to significant thermal gradients, particularly in zones where fluids are mixed at different temperatures.
After a certain period of use, this local damage can lead to crack initiation and propagation. The aim of the code's rules is to limit the risk of initiation by means of layout rules, and to use analysis to guarantee the absence of macroscopic crack initiation that could jeopardize the prevention of other damage modes.
Strictly speaking, there...
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Preventing fatigue damage
Preventing sudden-break damage
Documentation sources
Text references
Websites
ASME American Society of Mechanical Engineers http:/;/;www.asme.org
AFCEN Association Française pour les règles de conception et de construction des Chaudières Électro-Nucléaires (French association for the design and construction of electro-nuclear boilers) http:/;/;www.afcen.com
...Regulations
Arrêté du 12 décembre 2005 applicable aux Équipements Sous Pression Nucléaires (ESPN) ; JO de la République Française, January 22, 2006.
Arrêté du 26 février 1974 portant application de la réglementation des appareils à pression aux chaudières nucléaires à eau. Collection of texts published in "Sûreté Nucléaire en France". Les éditions des Journaux Officiels.
Directive 97/;23/;EC...
Standards
- Récipients sous pression non soumis à la flamme. - NF EN 13445 -
- Tuyauteries industrielles métalliques. - NF EN 13480 -
- Chaudières à tubes d'eau et installations auxiliaires. - NF EN 12952 -
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