1. Task 3.3 Fuel Transfer System Conceptual design Joel Janssens SCKCEN LEADER WP3 Technical Meeting, Karlsruhe, 20/11/2012 Copyright © 2011 SCKCEN

2. Fuel Transfer System MYRRHA - ALFRED comparison © SCKCEN ComponentItemMYRRHAALFRED ReactorIn vessel storageYes In-vessel fuel storage no Cooling period420d (840d) (not fixed) 10d (confirmed) FAGeometryHexagonal wrapper, wired fuel pin Hexagonal wrapper ReshufflingAt the bottom, by IVFH machine On top, no in- vessel machines Loading/unloadingTop loading

3. Fuel Transfer System MYRRHA - ALFRED comparison © SCKCEN ComponentItemMYRRHAALFRED FAFuel vector (U,Pu)O2 MOX–30%PuU / Pu / minor actinides Max. burn-up60MWd/kgHM100MWd/kgHM (confirmed as target) Deacy heat1200W/FA8.600W/FA (confirmed) Max. clad T600°C (long exposure time to creeps, 10y) 650°C (short exposure time to creep, confirmed)

4. Fuel Transfer System MYRRHA - ALFRED comparison © SCKCEN ComponentItemMYRRHAALFRED StorageStorage periodSeveral decades Storage typeDry storageWet storage – in water Storage Containment In canisterDirect contact Storage coolingGas convectionNatural convection

5. Fuel Transfer System MYRRHA - ALFRED comparison © SCKCEN ComponentItemMYRRHAALFRED TransferContainmentIn canister (probably) Providing limited shielding In canister (flask) Providing limited shielding Building requirement Red zone - No hot cell Red zone – No hot cell ReliabilityBack-up system Cleaning before storage Probably notno FA leak testyes

6. Fuel Transfer System CFD © SCKCEN CFD simulation / input data: Steady state FA: Hexagonal 127pins/FA height 600mm Active profile: axial cosine with extrapolation length of 1.035m Total pin length 1430mm Pin external diameter: 10.50mm Pin material: MOX Wrapper: T91 Cladding: Ti15-15 N2 environment Residual decay heat after 10d:8.6kW/FA Criterium:cladding temp. <650°C (due to creep) check in all conditions - > safety authorities

7. Fuel Transfer System CFD © SCKCEN CFD simulation / output data: Case 1: 8.6kW, natural convection, thermal radiation, no cask check in all conditions - > safety authorities

8. Fuel Transfer System CFD © SCKCEN CFD simulation / output data: Case 2: 4.3kW, natural convection, thermal radiation, cask check in all conditions - > safety authorities

9. Fuel Transfer System CFD © SCKCEN CFD simulation / output data: Case 3: 8.6kW, forced convection 2m/s at bottom of cylinder, thermal radiation, cask (cylinder dia. 200mm) check in all conditions - > safety authorities

10. Fuel Transfer System CFD © SCKCEN CFD simulation / output data: Case 4: 8.6kW, forced convection 20m/s at bottom of cylinder, thermal radiation, cask (cylinder dia. 200mm) check in all conditions - > safety authorities

11. Fuel Transfer System Lay-out © SCKCEN Fuel transfer lay-out: concept check in all conditions - > safety authorities

12. Fuel Transfer System Cask © SCKCEN Cask: concept check in all conditions - > safety authorities

13. Fuel Transfer System Gripper © SCKCEN Gripper: concept check in all conditions - > safety authorities

14. Fuel Transfer System Canister © SCKCEN Canister: concept check in all conditions - > safety authorities

15. Fuel Transfer System Problem & concerns © SCKCEN Fuel active zone above lead level, but not cooled. check in all conditions - > safety authorities

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