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5. Prevention of progressive deformation damage
5.1 Definitions
Progressive deformation damage can be caused by variations in the loading applied to the device, and in particular by cyclical changes resulting from variations in nuclear reactor power and start-up and shutdown operations.
First of all, let's stress the importance of stress classification. It has already been shown that, in the case of excessive deformation, only primary stresses should be limited, since secondary stresses resulting from imposed deformations are likely to be redistributed following moderate plastic deformation. The same cannot be said for cyclic loading, where variations in secondary stresses must be limited.
Generally speaking, when a first loading cycle is applied under a combination of primary and...
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Prevention of progressive deformation damage
Preventing fatigue 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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