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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


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


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


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


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


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


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


RESULTS – Thermal-hydraulics

PHEBUS – Containment pressure & atm. temperature

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RESULTS – Thermal-hydraulics

KAEVER – Containment pressure & atm. temp. (test K187)

ERMSAR 2007


RESULTS – Thermal-hydraulics

PACOS – Containment pressure

ERMSAR 2007


RESULTS – Thermal-hydraulics

PACOS – Atmosphere temperature

ERMSAR 2007


RESULTS – Thermal-hydraulics

LACE – Containment pressure & atm. temperature

ERMSAR 2007


RESULTS – Thermal-hydraulics

VVER-1000/320 – Containment pressure

Comparison ASTEC CPA - MELCOR

ERMSAR 2007


RESULTS – Aerosol and FP behaviour

PHEBUS – Aerosol concentration in atmosphere

Cesium

Iodine

ERMSAR 2007


RESULTS – Aerosol and FP behaviour

KAEVER – Aerosol dry and wet concentration

Test K187:

CsOH, CsI, Ag aerosols

ERMSAR 2007


RESULTS – Aerosol and FP behaviour

LACE – Aerosol dry concentration

CsOH: soluble

MnO: non-soluble

ERMSAR 2007


RESULTS – Aerosol and FP behaviour

VVER-1000/320 – Aerosol and noble gases concentration

Comparison ASTEC CPA - MELCOR

ERMSAR 2007


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


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