1. A case history of CFD support to Accelerator Driven System plant
Vincent Moreau
CRS4, Energy & Environment Program
Luigi Mansani, Maurizio Petrazzini
Ansaldo Nucleare
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

2. What is an Accelerator Driven System ?
An Accelerator Driven System, or ADS, consists in a sub-critical nuclear fission reactor coupled with a proton accelerator by means of a target system.
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

3. A case history of CFD support to ADS system plant
THE EUROTRANS PROJECT
The Integrated Project EUROTRANS, funded by the European Commission (FP6, ) is aimed at providing:
the advanced design of a multi purpose research oriented ADS, called XT-ADS (600 Mev, 80 MWth)
The preliminary design of an industrial scale ADS, called EFIT (800 Mev, 400 MWth)
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

4. A case history of CFD support to ADS system plant
ENEA, Bologna
Neutronics
Ansaldo, Genoa coordination, design
CRS4, Pula
CFD
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

5. A case history of CFD support to ADS system plant
EFIT
European Facility for Industrial Transmutation
Beam power: 800 Mev
Beam intensity: ~20 mA
Plant power: ~400 MWth
Primary coolant: pure lead
Primary coolant flow rate: 36,000 kg/s
Core inlet temperature: 400 C
Core outlet temperature: 480 C
Reactor vessel size: 10 m diameter, 12 m high
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

6. A case history of CFD support to ADS system plant
EFIT
Ansaldo design (1/2)
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

7. A case history of CFD support to ADS system plant
EFIT 2D CFD simulation
Bottom + Core + Inner Plenum
Nominal power and flow rate
Differentiated core porous resistance
Objectives:
Preliminary simulation for support to discussion
Set up physical properties
Get confident with object under study
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

8. A case history of CFD support to ADS system plant
EFIT 2D CFD simulation
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

9. A case history of CFD support to ADS system plant
EFIT 2D CFD simulation
Effects:
Withdraw from core CFD analysis (done by another partner ENEA, making also the core arrangement and the neutronic calculation)
Separation of bottom and top concern
Change of the bottom grid orientation
Investigate on pump entrance flow
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

10. Change of the bottom grid
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

11. A case history of CFD support to ADS system plant
3D CFD check
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

12. A case history of CFD support to ADS system plant
3D CFD check
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

13. A case history of CFD support to ADS system plant
3D CFD check
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

14. A case history of CFD support to ADS system plant
EFIT inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

15. A case history of CFD support to ADS system plant
EFIT inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

16. A case history of CFD support to ADS system plant
EFIT inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

17. A case history of CFD support to ADS system plant
EFIT inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

18. A case history of CFD support to ADS system plant
EFIT inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

19. A case history of CFD support to ADS system plant
EFIT inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

20. A case history of CFD support to ADS system plant
EFIT inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

21. EFIT simplified inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

22. EFIT simplified inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

23. EFIT simplified inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

24. EFIT simplified inner plenum
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

25. EFIT simplified inner plenum
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A case history of CFD support to ADS system plant

26. A case history of CFD support to ADS system plant
EFIT Down-comer
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A case history of CFD support to ADS system plant

27. A case history of CFD support to ADS system plant
EFIT Down-comer
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A case history of CFD support to ADS system plant

28. A case history of CFD support to ADS system plant
EFIT Down-comer
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

29. A case history of CFD support to ADS system plant
EFIT Down-comer
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

30. A case history of CFD support to ADS system plant
EFIT Down-comer
Before
After
After,
After 3min transient
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

31. A case history of CFD support to ADS system plant
XT-ADS
Beam power: 350 or 600 Mev
Beam intensity: max 5 or 2.5 mA
Plant power: ~70 MWth
Primary coolant: Lead-Bismuth Eutectic
Primary coolant flow rate: 6,000 kg/s
Core inlet temperature: 300 C
Core outlet temperature: 380 C
Reactor vessel size: ~ 5 m diameter, 8 m high
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

32. Ansaldo design, strongly inspired from SCK-CEN Myrrha design
XT-ADS
Ansaldo design, strongly inspired from SCK-CEN Myrrha design
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A case history of CFD support to ADS system plant

33. A case history of CFD support to ADS system plant
XT-ADS
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

34. A case history of CFD support to ADS system plant
XT-ADS
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

35. A case history of CFD support to ADS system plant
XT-ADS
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

36. A case history of CFD support to ADS system plant
XT-ADS
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

37. A case history of CFD support to ADS system plant
XT-ADS
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

38. XT-ADS: shut-down transient
Extreme scenario
Beam interrupted: core decay heat
Pump stops in 3s
SGU stops in 3s
Internal DHR system fails
Only external RVACS operative
20,000s of transient
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A case history of CFD support to ADS system plant

39. XT-ADS: shut-down transient
Initial condition
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A case history of CFD support to ADS system plant

40. XT-ADS: shut-down transient
First 50s
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A case history of CFD support to ADS system plant

41. XT-ADS: shut-down transient
Modified colour scales: from 50s to 20,000s
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A case history of CFD support to ADS system plant

42. XT-ADS: shut-down transient
Situation at time=20,000s
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A case history of CFD support to ADS system plant

43. XT-ADS: shut-down transient
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

44. XT-ADS: shut-down transient
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

45. A case history of CFD support to ADS system plant
Concluding words
We have presented some situations in which CFD proved to be a useful support to the designer and led to design variants.
The extensive use of “over-simplified but not rigid” treatment of pumps, heat exchangers, by-pass, core heat release allowed to investigate medium and large scale 3D behaviours in a rather consistent way.
This work has been made possible because the designers and the CFD engineer took time to exchange information and motivation, both explaining and listening…
More images and animations on:
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant

46. Thank you for your attention
ICONE 17, Brussels, July 13, 2009
A case history of CFD support to ADS system plant