1 / 18

ERMSAR 2007 FZ Karlsruhe, June 12-14, 2007

ERMSAR 2007 FZ Karlsruhe, June 12-14, 2007.

teneil
Download Presentation

ERMSAR 2007 FZ Karlsruhe, June 12-14, 2007

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ERMSAR 2007FZ Karlsruhe, June 12-14, 2007 Recent activities on validation of modelling of thermal-hydraulic and aerosol phenomena in ASTEC CPAIvo KLJENAK1, Maik DAPPER2, Jiři DIENSTBIER3, Luis E. HERRANZ4, Mohammed BENDIAB2, Marco K. KOCH2, Joan FONTANET41) Jozef Stefan Institute2) Ruhr-Universitaet Bochum 3) Nuclear Research Institute Rez 4) Centro de Investigaciones Energeticas Medio Ambientales y Tecnologicas

  2. INTRODUCTION • Validation of the ASTEC V1.2 CPA: modeling of thermal-hydraulic, aerosol and fission product phenomena. • Simulations of transients in containment systems of different scales • Small-scale experimental facilities (comparison with experiment): • PHEBUS containment vessel • KAEVER vessel • Large-scale experimental facilities (comparison with experiment): • LACE facility • Battelle Model Containment • Real-scale system (comparison with MELCOR): • VVER-1000 NPP containment ERMSAR 2007

  3. Facilities and transients PHEBUS Containment (IRSN Cadarache) • Experiment FPT2 • Injections in containment: • steam, H2, N2, • aerosols. Volume: 10.0 m3 3 condensers CPA model: 3 c.v. ERMSAR 2007

  4. Facilities and transients KAEVER Vessel (Becker Tech., Eschborn) • Purpose: aerosol behaviour in saturated and non-saturated atm. • Injections: • steam, N2, • aerosols (soluble: CsOH, CsI, non-soluble: Ag, mixtures). • Tests • K188: CsOH aerosols • K186: CsOH+Ag aerosols • K187: CsOH+CsI+Ag aeros. • K123: CsI aerosols • K148: Ag aerosols Volume: 10.6 m3 CPA model: 1 c.v. ERMSAR 2007

  5. Facilities and transients Battelle Model Containment (Battelle, Eschborn) • Experiment PACOS Px1 • Sequence Px1.2 • (R7 sealed, vol. 600 m3) • Purposes: • steam-air mixing in containment, • influence of containment sprays. Phase 1: steam injection, sprays Phase 2: steam inject. X 3, sprays Phase 3: spray flow rate increased Phase 4: no steam injection, sprays Volume: 640 m3 CPA model: 23 c.v. ERMSAR 2007

  6. Facilities and transients LACE Vessel (Westinghouse) • Experiment LA4 • Purpose: aerosol behaviour in containment • Aerosols: • CsOH (soluble) • MnO (non-soluble) • Experiment: 8 phases • 1: steam injection • 2: CsOH, steam, carrier gas • 3: CsOH + MnO, steam, carrier gas • 4: MnO, steam, carrier gas • 5: steam • 6: containment venting • 7: cooldown (closed vessel) Volume: 852 m3 CPA model: 1 c.v. ERMSAR 2007

  7. Facilities and transients VVER-1000/320Containment • Balakovo NPP (Temelin NPP) • ABH scenario: • Hot leg large-break LOCA with blackout (ECCS and sprays not actuated) • Start: double-ended break of a circul. loop • Core uncovery • Later: vessel bottom head failure • Steam injection, H2 injection, heat transfer from primary system: modelled as external sources. CPA model: 6 c.v. ERMSAR 2007

  8. RESULTS – Thermal-hydraulics PHEBUS – Containment pressure & atm. temperature ERMSAR 2007

  9. RESULTS – Thermal-hydraulics KAEVER – Containment pressure & atm. temp. (test K187) ERMSAR 2007

  10. RESULTS – Thermal-hydraulics PACOS – Containment pressure ERMSAR 2007

  11. RESULTS – Thermal-hydraulics PACOS – Atmosphere temperature ERMSAR 2007

  12. RESULTS – Thermal-hydraulics LACE – Containment pressure & atm. temperature ERMSAR 2007

  13. RESULTS – Thermal-hydraulics VVER-1000/320 – Containment pressure Comparison ASTEC CPA - MELCOR ERMSAR 2007

  14. RESULTS – Aerosol and FP behaviour PHEBUS – Aerosol concentration in atmosphere Cesium Iodine ERMSAR 2007

  15. RESULTS – Aerosol and FP behaviour KAEVER – Aerosol dry and wet concentration Test K187: CsOH, CsI, Ag aerosols ERMSAR 2007

  16. RESULTS – Aerosol and FP behaviour LACE – Aerosol dry concentration CsOH: soluble MnO: non-soluble ERMSAR 2007

  17. RESULTS – Aerosol and FP behaviour VVER-1000/320 – Aerosol and noble gases concentration Comparison ASTEC CPA - MELCOR ERMSAR 2007

  18. CONCLUSIONS • Several experiments and hypothetical scenario in facilities of different scales simulated with ASTEC CPA module • Thermal-hydraulic phenomena • Good general agreement between simulation and experimental / other code results. • Largest differences observed for temperature in small and large scale systems, and in real-scale system between ASTEC/CPA and MELCOR in wall heat transfer • Aerosol behaviour • Dry aerosol concentrations in vessels well simulated in small and large scale systems. • Deficiencies identified in small-scale facilities: • slight overprediction of aerosol sedimentation, • low deposition rate of wet aerosols. ERMSAR 2007

More Related