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7. Preventing sudden-break damage
7.1 Brittle fracture and ductile tear
The prevention of the risk of sudden failure includes the prevention of the risk of brittle failure, as well as the risk of ductile tearing.
Previous damage prevention rules assumed a structure free of postulated hypothetical defects. Sudden failure analyses have the particularity of assuming the existence of a defect, and aim to define a design (including the choice of materials) that is tolerant to defects in the event that, despite the precautions taken, such defects exist in the structure or are created in service as a result of the operating conditions imposed.
The risk of sudden rupture depends on :
material toughness;
...
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Preventing sudden-break damage
Other potential 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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