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GE’s ESBWR by T. G. Theofanous. ESBWR SA Containment Highlights BiMAC Not to scale UDW LDW +PCCS no LT failure EVE.

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Presentation on theme: "GE’s ESBWR by T. G. Theofanous. ESBWR SA Containment Highlights BiMAC Not to scale UDW LDW +PCCS no LT failure EVE."— Presentation transcript:

1 GE’s ESBWR by T. G. Theofanous

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

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

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

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 Case G More Dynamics Regime III




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 40-150 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 Saturated Low Level Upper Bound Load Subcooled 1-2 m

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 Case No. q up q dn q s q up / q dn q max / q dn or s A6330N/A2.11.25 B12054N/A2.21.25 C17880N/A2.21.25 C-3D23868N/A3.51.2 M-3D286852803.43.0 / 1.4 M2551253302.03.0 / 1.4 N2381263401.93.0 / 1.2 O168832452.03.0 / 1.2 Summary of Power Split and Peaking Factor Results from the Direct Numerical Simulations (all fluxes in kW/m2 ) 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 ThreatFailure ModeMitigation DCHEnergetic DW FailurePressure Suppression Vents Reinforced Concrete Support UDW Liner Thermal FailureLiner Anchoring System LDW Liner Thermal FailureReinforced Concrete Barrier Gap Separation from UDW EVEPedestal/Liner FailureDimensions and Reinforcement BiMAC FailurePipe Size and Thickness Pipes Embedded into Concrete BMP & CCI BiMAC Activation FailureSensing & Actuation Instrumentation Diverse/Passive Valve Action Local BurnoutNatural Circulation Water DepletionNatural Circulation Local Melt-ThroughRefractory Protective Layer

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