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GE’s ESBWR by T. G. Theofanous.

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Presentation on theme: "GE’s ESBWR by T. G. Theofanous."— Presentation transcript:

1 GE’s ESBWR by T. G. Theofanous

2 ESBWR SA Containment Highlights
UDW EVE LDW BiMAC Not to scale +PCCS no LT failure

3 ESBWR SA Complexion

4 SA Threats and Failure Modes
Direct Containment Heating (DCH) Energetic Failure of UDW, Liner (thermal) Failure Ex-Vessel Explosions (EVE) Pedestal/Liner Failure, BiMAC-Pipes Crushing Basemat Melt Penetration (BMP) BiMAC Thermal Failure (Burnout, Dryout, Melt Impingement)

5 Direct Containment Heating (DCH)

6 DCH: Key features of the geometry
Highly non-uniform gas flow Representative but not to scale

7 DCH in suppression pool containments: model verification basis
IET CLCH Model 1:1 Scale PSTF Vent Clearing Model and 1:40 scale

8 Validation Basis: IET DCH Tests… GE PSTF Vent Clearing
CLCH model. Complete transient

9 Actual blowdowns used as inputs for comparison

10 Comparison to PSTF data

11 Comparison to IET-1RR and -8 data

12 Comparison to IET-1 data

13 Quantification of Loads
Regime I HYPOTHETICAL Regime II Creep Rupture, Bounding

14 Case F Regime III More Dynamics Case G




18 More sensitivities run on condensation and gas-cooling efficiency,
oxidation efficiency, composition of DW atmosphere, etc…

19 Minimum (bounding) Margins to Energetic DCH Failure
Upper Bound Load Fragility

20 Ex-Vessel Explosions (EVE) Pedestal/Liner Failure, BiMAC-Pipes Crushing

21 Sample SE calculations
~ 1 ton/s melt release 1, 2, 5 m deep pools Saturated and subcooled water ~100 kPa s on the floor kPa s on the side walls

22 Pedestal model in DYNA3D
Verified extensively in High Explosive work

23 Pedestal damage in DYNA 3D
600 kPa s loading

24 Pedestal Failure Margins to EVE 1 to 2 m Subcooled Pools
Upper Bound Load Lower Bound Fragility Significant upwards revision of previously used failure criteria on pedestal walls

25 BiMAC Structural Configuration
Ie Schedule 80 pipes

26 DYNA3D model of BiMAC

27 BiMAC damage in DYNA3D 200 kPa s loading

28 BiMAC Failure Margins Due to EVE 1-2 m subcooled pools
Upper Bound Load Subcooled 1-2 m Upper Bound Load Saturated Low Level

29 Lower Drywell

30 BiMAC Detail

31 BiMAC Flow Path

32 Natural convection patterns

33 The Peaking at the Edge of Near-Edge Channels is the most Limiting

34 Summary of Power Split and Peaking Factor Results
from the Direct Numerical Simulations (all fluxes in kW/m2 ) Case No. qup qdn qs qup / qdn qmax / qdn or s A 63 30 N/A 2.1 1.25 B 120 54 2.2 C 178 80 C-3D 238 68 3.5 1.2 M-3D 286 85 280 3.4 3.0 / 1.4 M 255 125 330 2.0 N 126 340 1.9 3.0 / 1.2 O 168 83 245 The 3D results were confirmed with further calculations that included refined meshes, and a 10-fold increase in viscosity due to addition of the sacrificial concrete.

35 Sample calculations of turbulent natural convection

36 Local peaking mechanism

37 Bounding estimates of thermal loads
Central Channels: Near-Edge Channels:

38 The ULPU facility

39 Coolability Limits for BiMAC Applicability based on similarity of geometries and flow/heating regimes

40 Thermal Loads against Coolability Limits in BiMAC Channels

41 Thermal Margins for BiMAC Local Burnout

42 Natural convection boiling in inclined channels: the SULTAN facility
Vertical and 10 degrees inclination Characteristic length: 3 and 15 cm Channel length: 4 m Pressure: 0.5 MPa Power levels 100 to 500 kw/m2 Detailed pressure drop data Top-heated plate, 15 cm wide

43 Boiling in inclined channels: Sample comparisons for inclination

44 Natural convection in BiMAC: stable, self-adjusting flow

45 Thermal Margins for BiMAC no-Dryout due to water depletion or flow starvation

46 Conclusion (3): Summary of containment threats and mitigative mechanisms or systems in place for responding to them Threat Failure Mode Mitigation DCH Energetic DW Failure Pressure Suppression Vents Reinforced Concrete Support UDW Liner Thermal Failure Liner Anchoring System LDW Liner Thermal Failure Reinforced Concrete Barrier Gap Separation from UDW EVE Pedestal/Liner Failure Dimensions and Reinforcement BiMAC Failure Pipe Size and Thickness Pipes Embedded into Concrete BMP & CCI BiMAC Activation Failure Sensing & Actuation Instrumentation Diverse/Passive Valve Action Local Burnout Natural Circulation Water Depletion Local Melt-Through Refractory Protective Layer

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