1. Page 1 Petten 27 – Feb. - 2013 ALFRED and ELFR Secondary System and Plant Layout

2. Page 2 Petten 27 – Feb. - 2013 Secondary system  optimized for demonstrating that ALFRED reactor would be able to efficiently produce electric power Important considerations and constraints: –Lead temperature never drops to alarming values –ST  182 bar; 450ºC superheated steam –Pipes dimensioning: feed water, main steam and pipes through the containment –Operational Modes: Normal Mode  Efficient electric production Partial load Mode  Partial thermal load operation By-pass Mode  Direct heat transfer through the condenser Auxiliary heating Mode  Lead heating from the secondary system 1. Scope ALFRED Secondary System

3. Page 3 Petten 27 – Feb. - 2013 Secondary system main parameters: –Steam Generators: Outlet pressure: 182 bar (180 bar at inlet of the HP turbine valve) Inlet pressure: 188 bar Outlet temperature: 450ºC Inlet temperature: 335ºC Steam flow: 192.7 Kg/s. Thermal power 300 MWth –Heat sink: Mechanical draft cooling tower Nominal: 18ºC; 60% relative humidity Extreme summertime (EUR): 37ºC; 60% relative humidity Extreme wintertime (EUR): -25ºC; 100% relative humidity –Steam turbine group inlet control: throttle control valve –Steam turbine mechanical losses: 0.25% –Deaerator elevation: 22.86 m 2. Main input data ALFRED Secondary System

4. Page 4 Petten 27 – Feb. - 2013 Two turbines HP and LP with three extractions each Heater fed with main steam (Feedwater Temp. Control Heater - FWTCH) Three low pressure (LP) preheaters and three high pressure (HP) preheaters Single train for the HP and LP preheaters Moisture separator (MS) is included HPT exhaust pressure of 12 bar 3. Secondary system options ALFRED Secondary System

5. Page 5 Petten 27 – Feb. - 2013 Steam Cycle Efficiency: 44,68% Net Cycle Efficiency: 41,50% Generator Output: 133 MWe ALFRED Secondary System

6. Page 6 Petten 27 – Feb. - 2013 4. Secondary system layout ALFRED Secondary System

7. Page 7 Petten 27 – Feb. - 2013 4. Secondary system feasibility study: Normal Mode Turbine configuration: –HP Turbine and a LP Turbine, with no intermediate stage (typical nuclear configuration) –HP Turbine: 180 bar to 12 bar range, with three extraction lines –Turbine power  range for medium turbines (less than 200 MW) –Axial exhaust turbine is chosen for ALFRED ALFRED Secondary System

8. Page 8 Petten 27 – Feb. - 2013 4. Secondary system feasibility study: Normal Mode ALFRED Secondary System

9. Page 9 Petten 27 – Feb. - 2013 4. Secondary system feasibility study: Partial Load Mode Throttle control valve  System is able to lower the load without lowering too much the pressure of the temperature Performance decreases as the load decreases FWTC Heater Valve maintain the feed water temperature (335ºC) ALFRED Secondary System

10. Page 10 Petten 27 – Feb. - 2013 Only liquid water is not feasible System with only steam is proposed: –Lead temperature: 380ºC – 400ºC –Steam temperature: 400ºC – 450ºC –Optimum SG inlet pressure?  30 bar 4. Secondary system feasibility study: Auxiliary Heating Mode ALFRED Secondary System

11. Page 11 Petten 27 – Feb. - 2013 Deaerator (operating at atmospheric pressure) fed with main steam FWTC Heater maintains 335ºC High FWTC Heater DDA  attemperation with condensate water 4. Secondary system feasibility study: By-Pass Mode ALFRED Secondary System

12. Page 12 Petten 27 – Feb. - 2013 4. Secondary system feasibility study: Heat Sink Analysis Environmental conditionsNominalExtreme summerExtreme winter Steam Cycle Efficiency (%)44.6842.57> 44.68 Transferred Heat (MW)168175< 168 Condenser Pressure (bar)0.0540.101< 0.054 Nominal Extreme summer Extreme winter - Mechanical draft cooling tower - Nominal: 18ºC; 60% relative humidity - Extreme summertime (EUR): 37ºC; 60% relative humidity - Extreme wintertime (EUR): -25ºC; 100% relative humidity ALFRED Secondary System

13. Page 13 Petten 27 – Feb. - 2013 5. Main steam and feed water pipes dimensioning High temperature material: SA-335 Gr91 Design temperature: 450ºC Design pressure: 20 MPa ALFRED Secondary System

14. Page 14 Petten 27 – Feb. - 2013 Good performance of the proposed secondary system is demonstrated Requirements are complied: –High steam cycle efficiency: 44.68%  reactor economic viability –Good behavior at partial loads –Minimum FW temperature at SG inlet is well controlled (335ºC) –By-pass operation mode is feasible –Auxiliary heating system is proposed: heating lead from secondary system –Performance at extreme summer and wintertime SG operational parameters are defined Pipes dimensioning (SA-335 Gr91) and preliminary track through the containment is proposed 6. Conclusions ALFRED Secondary System

15. Page 15 Petten 27 – Feb. - 2013 Plant surface: 276x270 m 2 ALFRED Plant Layout

16. Page 16 Petten 27 – Feb. - 2013 ALFRED Reactor Building Supported over seismic isolators

17. Page 17 Petten 27 – Feb. - 2013 ELSY PLANT AREATENTATIVE PARAMETERS PowerAbout 600 MWe Thermal efficiencyAbout 40 % Primary coolantPure lead Primary systemPool type, compact Primary coolant circulation (at power)Forced Primary coolant circulation for DHRNatural circulation + Pony motors Core inlet temperature~ 400°C Core outlet temperature~ 480°C FuelMOX with assessment also of behaviour of nitrides and dispersed minor actinides Fuel handlingSearch for innovative solutions Main vesselAustenitic ss, hanging, short-height Safety VesselAnchored to the reactor pit Steam GeneratorsIntegrated in the main vessel Secondary cycleWater-supercritical steam Primary PumpsMechanical, in the hot collector InternalsAs much as possible removable, (objective: all removable) Hot collectorSmall-volume above the core Cold collectorAnnular, outside the core, free level higher than free level of hot collector DHR coolersImmersed in the cold collector Seismic design2D isolators supporting the main vessel ELFR Secondary System

18. Page 18 Petten 27 – Feb. - 2013 The data for the supercritical cycle were: Steam generator inlet temperature: 335ºC Steam generator outlet temperature: 450ºC Steam generator outlet pressure: 24,3 Mpa Steam Generator pressure for supercritical cycle: 26 MPa Efficiency Steam Generator Inlet Temperature Mass Flow Superheater Steam Cycle36,25%260 ºC1009 kg/s Supercritical Steam Cycle43,24%335 ºC961,3 kg/s He-Brayton Cycle30,67%308,6 ºC2665 kg/s CO2 Supercritical Cycle41,69%259,8 ºC6022 kg/s ELFR Secondary System

19. Page 19 Petten 27 – Feb. - 2013 Access Control Visitor Building Administration Building Cooling Towers Pump House Water Storage Tanks Service Water Building & Water Treatment Effluent Collection Pond Make-Up Pumps House Dematerialized Tank N2 Plant & Warehouse Diesel Tank Warehouse Switch Yard Cold Machine Shop Turbine Building Auxiliary BoilerReactor Building Condensate Storage Tanks Diesel Generators Transformers Service Building & Operation Support Center Fire Brigade & Fire Water Storage Tank Independent Spent Fuel Storage Fuel Building Plant surface: 360 x 450 m² ELFR Plant Layout. Option 1

20. Page 20 Petten 27 – Feb. - 2013 Cooling Tower Pump House Service Water Building & Water Treatment Effluent Collection Pond Make-Up Pumps House Dematerialized Tank Condensate Storage Tanks N2 Plant & Warehouse Transformers Diesel Tank Warehouse Diesel Generators Switch Yard Cold Machine Shop Turbine Building Service Building & Operation Support Center Fire Brigade & Fire Water Storage Tank Reactor Building Independent Spent Fuel Storage Fuel Building Administration Building Visitor Building Access Control ELFR Plant Layout. Option 2

21. Page 21 Petten 27 – Feb. - 2013 ELFR Reactor Building