6. Problems relating to production
6.1 Site organization
The containment system is a specific civil engineering structure that requires the contractor to have perfect mastery of the following areas:
boiler making for the sealing skin (REP 900) and the penetrations, personnel locks and equipment buffers; this part is subcontracted to a specialist (Neyrpic or Delattre-Levivier);
concrete with good workability in difficult conditions (dense reinforcement) and sufficient compactness to ensure good gas tightness (REP 1,300-1,450);
prestressing using large cables, subcontracted to a specialist: GPN (Groupement pour la Précontrainte Nucléaire).
Standardization meant that EDF...
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Problems relating to production
In-service testing and monitoring of the enclosure
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