1. LEADER achievements and next steps 4 th GB MEETING of the LEADER project Genova May 10 th 2013 Alessandro Alemberti Alessandro.Alemberti@ann.ansaldo.it

2. LEADER STATUS Most of the deliverables issued but yet some deliverables to be provided. You will found a complete list of the due deliverables in the PCC meeting minutes and the leading organization responsible of the issue. Special efforts must be done to issue remaining deliverables within mid June. It must be remarked that we need to satisfy our obligation with EC to get final payment and close the project. GB members are kindly requested to push inside their organization to speed-up issue of remaining documentation. Apart from the above contractual obligations that must be fullfilled it is important to understand where we are, what we have done till now and where we would like to go ……

3. Demo Configuration we started from this.. (without a name)

4. MAIN COOLANT PUMP REACTOR VESSEL SAFETY VESSEL FUEL ASSEMBLIES STEAM GENERATOR STEAM GENERATOR MAIN COOLANT PUMP REACTOR CORE ALFRED - Reactor Configuration Power:300 MWth (125 Mwe) Primary cycle: 400-480 °C Secondary cycle: 335-450 °C, 180 bar … and now we have….

5. ELSY configuration ELSY we started from this..

6. ELFR - Reactor Configuration Power:1500 MWth (600MWe) Primary cycle: 400-480 °C Secondary cycle: 335-450 °C, 180 bar Spiral SGS (8) – once through 4 Isolation condenser connected to SGs (DHR1) 4 Dip coolers immersed in the main vessel (DHR2) … and now we have….

7. COMMENTS During project evolution there was a “controlled shift” of activities from ELFR to ALFRED. Very early it became clear that the ELFR configuration we are able to make in the project will be different from the final “industrial size” configuration of a 600 MWe LFR. ELFR will benefit of all advances that will be made in the coming years so that it is not really useful to frozen a reactor configuration. On the other hand it was a must to have a “reference configuration”. As a consequence the project concentrated its efforts on ALFRED. I think that one of the main achievements of LEADER is that now ALFRED is recognized as one of the 4 ESNII projects. This will probably give us the opportunity to proceed our activities in the future if we will be able to organize ourselves and our activities. But a main question remain: Are we really happy of the conceptual configuration of ALFRED?

8. NO! we NEED an improved configuration Guidelines to think about : Core region and generally inner vessel design based on previous experience of FR, no need to change, some problems generated by extension of the Fas to cover gas but no one proposed an alternative solution. Acceptable design. Choice of bayonet SGs forced the introduction of the tube bundle skirt. Lead in the pool above SGs exit do not participate In the primary side circulation, stratification is likely to take place, natural circulation reduced although still at acceptable values. Provisions or modifications to be taken. One of the main comments of the Safety Authorities at the Petten meeting has been the absence of DHRs systems diversity. It seems that the additional safety introduced by the double wall, continuously monitored gap is not enough to allow a relaxation of the diversity requirement. Need to introduce a diversified DHR system in ALFRED. NO Solution found yet. Please contact me if you have some good idea….

9. NEED of an improved configuration and …. Next Steps – after LEADER (first technical activities of consortium): - ALFRED Design Review -Proposal of modifications/provisions - New reference ALFRED design configuration - Confirmation of the viability/effectiveness of the proposals MATERIALS/CORROSION issue: -Need to define candidate materials but choice limited to materials already qualified from an irradiation point of view. -Need to face corrosion issue exploring all possible approaches: -Coating -Oxygen control -Lead chemistry -Corrosion inhibitors

10. THANK YOU FOR YOUR ATTENTION