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6vap. Fig. 4. - PHENIX steam generator The steam generators are located in the same building and this could be a common mode of failure in case of a sodium fire in one of the three circuits. In order to improve the protection against sodium fire the following works are in progress and should be archived in 1998 : partial isolation of each loop from the others, isolation of the sodium from the steam circuits, thermal protection of some structures (particularly the supports of the sodium pipes, the main parts of the structural steel network, the steam generator vessels), the construction of sodium recuperation tanks in case of leaks, the construction of a protection gallery for the command equipment, modification of the ventilation circuits, etc....
Flexibility is retained to accommodate a range of breeder and burner cores with the minimum of adaptation of the reactor design. The feedback from the operating fast reactors is achieved through a systematic review of the design of each system and component in the light of the European reactor experience and to the extent possible all fast reactor experience worldwide. So the Reference Design is the evolution of the EFR Consistent Design from the Phase 2 studies. It is a design where the economic goal is achieved through a compact layout by minimising the number of main components (6 Intermediate Heat Exchangers IHXs and 3 Primary Sodium Pumps) and a small rotating shield (see Table 1).
After technical review meetings, in February 1996, the Safety Authority did not rule on the possibility of extending the life time of PHENIX, and did not want to authorize performance of the 50 th cycle. The Safety Authority has requested safety improvements and technical demonstrations, before it examines the possibility of authorizing a new start-up of PHENIX, in particular : • The installation of a Safety Scram System (Complementary Shutdown System). • A demonstration of the possibility of reinforcing the plant against seismic loads (historically maximum seism) taking into account new design rules.