INB 101 - Orphee reactor. Additional safety assessment with respect to the accident which occurred in the Fukushima-Daiichi nuclear power station

After a presentation of some characteristics of the Orphee installation (buildings, reactor, circuits, integrated experimental devices, venting systems, electricity supply and distribution systems, reactor command and control and protection means, operation), this document reports the identification of cliff-edge risks and of critical structures and equipment. Then, it addresses the different risks: earthquake (installation sizing and compliance, margin assessment for the different structures and equipment), flooding (installation sizing, margin assessment), other extreme natural events (tempests, rainfalls, extreme earthquake inducing flooding), loss of electric supplies and of cooling systems. The next parts address the organization of severe accident management (exercises, available means, influence of other installations, confinement integrity after fuel damage) and subcontracting practices