Title: Recent activities on validation of modelling of thermal-hydraulic and aerosol phenomena in ASTEC CPA Ivo KLJENAK1, Maik DAPPER2, Jiri DIENSTBIER3, Luis E. HERRANZ4, Mohammed BENDIAB2, Marco K. KOCH2, Joan FONTANET4 1) Jozef Stefan Institute 2)
1Recent activities on validation of modelling of
thermal-hydraulic and aerosol phenomena in ASTEC
CPAIvo KLJENAK1, Maik DAPPER2, Jiri
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
ERMSAR 2007FZ Karlsruhe, June 12-14, 2007
2INTRODUCTION
- 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
3Facilities 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.
4Facilities 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 CsOHAg aerosols
- K187 CsOHCsIAg aeros.
- K123 CsI aerosols
- K148 Ag aerosols
Volume 10.6 m3 CPA model 1 c.v.
5Facilities 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.
6Facilities 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.
7Facilities and transients
VVER-1000/320 Containment
- 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.
8RESULTS Thermal-hydraulics
PHEBUS Containment pressure atm. temperature
9RESULTS Thermal-hydraulics
KAEVER Containment pressure atm. temp. (test
K187)
10RESULTS Thermal-hydraulics
PACOS Containment pressure
11RESULTS Thermal-hydraulics
PACOS Atmosphere temperature
12RESULTS Thermal-hydraulics
LACE Containment pressure atm. temperature
13RESULTS Thermal-hydraulics
VVER-1000/320 Containment pressure Comparison
ASTEC CPA - MELCOR
14RESULTS Aerosol and FP behaviour
PHEBUS Aerosol concentration in atmosphere
Cesium
Iodine
15RESULTS Aerosol and FP behaviour
KAEVER Aerosol dry and wet concentration
Test K187 CsOH, CsI, Ag aerosols
16RESULTS Aerosol and FP behaviour
LACE Aerosol dry concentration
CsOH soluble
MnO non-soluble
17RESULTS Aerosol and FP behaviour
VVER-1000/320 Aerosol and noble gases
concentration Comparison ASTEC CPA - MELCOR
18CONCLUSIONS
- 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.