ERMSAR COMET S2 5

Information about ERMSAR COMET S2 5

Published on January 16, 2008

Author: Sigfrid

Source: authorstream.com

Content

Slide1:  Bertrand SPINDLER, CEA, Grenoble Kresna ATKHEN, EDF, Villeurbanne Michel CRANGA, IRSN, Cadarache Jerzy FOIT, FZK, Karlsruhe Monica GARCIA MARTIN, UPM, Madrid Werner SCHMIDT, AREVA, Erlangen Tuomo SEVON, VTT, Espoo Claus SPENGLER, GRS, Cologne Simulation of Molten Corium Concrete Interaction in a Stratified Configuration: the COMET-L2-L3 Benchmark Late phase of MCCI: stratified configuration:  Late phase of MCCI: stratified configuration Molten Corium Concrete Interaction (MCCI) In some scenarios of Severe Accident, corium is assumed to spread over the concrete basemat of the reactor pit Ablation of the concrete occurs, with complex phenomena of thermohydraulics and physico-chemistry: MCCI Investigations concerning MCCI are still going on Late phase of MCCI Decrease of the ablation rate due to the decrease of the residual power the increase of the heat transfer areas Decrease of the gas flow rate issued from the concrete decomposition Decrease of the oxide phase density due to light oxides from the concrete decomposition Stratified configuration is expected Metal phase at the bottom (mainly Fe, Cr, Ni) Oxide phase at the top (mainly UO2, ZrO2, SiO2, CaO, Al2O3) Late phase of MCCI: stratified configuration:  Late phase of MCCI: stratified configuration Stratified configuration Main uncertainty: heat transfer between the two layers Consequence: axial and radial ablation rates not well known Few experimental programs The BETA test at FZK with a large test matrix New tests at FZK: COMET-L2 and COMET-L3 The COMET-L2-L3 benchmark COMET-L2 as for post-test simulation COMET-L3 for blind test simulation The COMET-L2-L3 benchmark:  The COMET-L2-L3 benchmark Frame SARNET WP 11.2: Molten corium concrete/ceramic interaction Participants CEA, AREVA, EDF, FZK, GRS, IRSN, UPM, VTT Schedule COMET-L2: March to August 2006 COMET-L3: September 2006 to January 2007 Only 1.5 month delay at the end Planned final meeting canceled COMET-L2, -L3 tests:  COMET-L2, -L3 tests MCCI tests at FZK Stratified oxide-metal configuration with metal at the bottom Input power in the metal layer (induction heating) No input power in the oxide layer COMET-L2 February 2005 Used for post-test simulations COMET-L3 November 2005 More oxide, higher heat flux, than COMET-L2 Water aspersion after a first period of dry erosion Used for blind simulations Slide6:  Scheme of the facility and of the concrete test section COMET-L2, -L3 tests Slide7:  Scheme of the thermocouples instrumentation in the plane NW-SE COMET-L2, -L3 tests Slide8:  COMET-L2 test 430 kg metal: 90 % Fe, 10 % Ni 35 kg oxide: 56 % Al2O3, 44 % CaO Mean power: 200 kW Initial temperature: 2023 K Power off after 1015 s Slide9:  COMET-L3 test 425 kg metal: 90 % Fe, 10 % Ni 211 kg oxide: 56 % Al2O3, 44 % CaO Mean power: 220 kW Initial temperature: 1940 K Top flooding at 800 s Power off after 1878 s Slide10:  COMET-L2, -L3 tests Initial period of about 100 s until end of initial overheat, with isotropic ablation Steady state regime with faster axial ablation rate Agreement with the results of the BETA tests COMET-L3: low influence of flooding COMET-L2, -L3 benchmark:  COMET-L2, -L3 benchmark Participants and code AREVA with COSACO CEA with TOLBIAC-ICB (base case and modifications) EDF with TOLBIAC-ICB FZK with WECHSL GRS with MEDICIS and with WEX IRSN with MEDICIS (base case and modifications) UPM with MELCOR (COMET-L3 only) VTT with MELCOR Same input data Models depending of the codes COMET-L2 post test simulations:  COMET-L2 post test simulations Metal temperature versus time (no measurements for comparison) power off initial period with overheat Large dispersion (150 K), but 6 results between 1750 and 1780 K COMET-L2 post test simulations:  COMET-L2 post test simulations Oxide temperature versus time (no measurements for comparison) Large dispersion: 450 K at 1000 s COMET-L2 post test simulations:  COMET-L2 post test simulations Axial ablation depth versus time initial period with overheat steady state regime Experiment: no symetry Large dispersion in the initial period Similar ablation rate in the steady state regime Maximum ablation depth underestimated COMET-L2 post test simulations:  COMET-L2 post test simulations Radial ablation depth versus time Radial ablation depth overestimated COMET-L2 post test simulations:  COMET-L2 post test simulations Final shape of the cavity COMET-L3 blind simulations:  COMET-L3 blind simulations initial period with overheat power off Metal temperature versus time (no measurements for comparison) Lower dispersion compared to COMET-L2 COMET-L3 blind simulations:  COMET-L3 blind simulations Oxide temperature versus time Lower dispersion compared to COMET-L2 COMET-L3 blind simulations:  COMET-L3 blind simulations Top surface temperature versus time, with measurement top flooding Before flooding dispersion 800 K measurements in between the calculations After flooding dispersion 1500 K only one code at water temperature COMET-L3 blind simulations:  COMET-L3 blind simulations Heat flux density from metal to oxide layer versus time Initial phase: positive or negative Steady state before flooding: positive After flooding: positive or negative COMET-L3 blind simulations:  COMET-L3 blind simulations Heat flux density at the top surface Flooding effet very different depending on the code top flooding COMET-L3 blind simulations:  COMET-L3 blind simulations Cumulated hydrogen production versus time Factor 5 between the final minimum and maximum results COMET-L3 blind simulations:  COMET-L3 blind simulations Axial ablation depth versus time Less dispersion than for COMET-L2 COMET-L3 blind simulations:  COMET-L3 blind simulations Radial ablation depth versus time Overestimation, or in agreement with the measurements COMET-L3 blind simulations:  COMET-L3 blind simulations Final shape of the cavity Overview of the codes and models:  Overview of the codes and models COSACO by AREVA Crust formation and solidification in the pool for oxide Coupling with CHEMAPP for physico-chemistry Heat transfer with slag layer for metal Isotropic heat flux distribution MEDICIS in ASTEC by IRSN Pool-crust interface temperature between solidus and liquidus IRSN: close to liquidus; GRS: solidus Heat transfer with slag layer Greene correlation for heat transfer between the two layers Multiplying factor for radial heat transfer (IRSN) MELCOR by Sandia National Laboratory Pool-crust interface temperature is solidus temperature Heat transfer with slag layer Greene correlation for heat transfer between the two layers Overview of the codes and models:  Overview of the codes and models TOLBIAC-ICB by CEA Phase segregation model with pool-crust interfacial temperature equal to liquidus temperature Coupling with GEMINI code for physico-chemistry Reference: isotropic heat flux distribution Multiplying factor for radial heat transfer (COMET-L2-L3) WECHSL by FZK Heat transfer with film or bubble or transition model Crusts at the interfaces Heat transfer between the two layers with a correlation by Haberstroh and Reinders modified for gas percolation WEX in ASTEC by GRS Modified version of WECHSL Different empirical fitting of the heat transfer models Summary :  Summary Large scatter of the code results for the different variables Large scatter for the same code by different users with different models Very different behavior of the heat transfer between the two layers MCCI phenomena still not well understood Results specific to the COMET-L2-L3 configuration ? Consequences of these uncertainties on reactor cases ? Next step for an answer to theses questions new benchmark proposed in the frame of SARNET for reactor cases

Related presentations


Other presentations created by Sigfrid

Diabetes Mellitus
29. 02. 2008
0 views

Diabetes Mellitus

bus108 pp 08spr
08. 05. 2008
0 views

bus108 pp 08spr

Ch01
07. 05. 2008
0 views

Ch01

Steenburgh
02. 05. 2008
0 views

Steenburgh

107249 firstfileFILE
02. 05. 2008
0 views

107249 firstfileFILE

Regional Roadshows generic
30. 04. 2008
0 views

Regional Roadshows generic

PE3 U2 R
24. 04. 2008
0 views

PE3 U2 R

Hydrogen Workshop
22. 04. 2008
0 views

Hydrogen Workshop

GW052307MS3Rv3Final
21. 04. 2008
0 views

GW052307MS3Rv3Final

0329
18. 04. 2008
0 views

0329

3 Johnson BMGs
10. 01. 2008
0 views

3 Johnson BMGs

Packaging
10. 01. 2008
0 views

Packaging

HIV AIDS PM
12. 01. 2008
0 views

HIV AIDS PM

PM Insv01
12. 01. 2008
0 views

PM Insv01

ISECON 2006 Sharp
13. 01. 2008
0 views

ISECON 2006 Sharp

Asthma 10 02
14. 01. 2008
0 views

Asthma 10 02

Panda life
15. 01. 2008
0 views

Panda life

Extinction
15. 01. 2008
0 views

Extinction

Empirical Formula
16. 01. 2008
0 views

Empirical Formula

Earth Resources
16. 01. 2008
0 views

Earth Resources

religion 1
17. 01. 2008
0 views

religion 1

020607 AmbassadorBriefing
21. 01. 2008
0 views

020607 AmbassadorBriefing

Christmas Sing along
15. 01. 2008
0 views

Christmas Sing along

Courseintro
04. 02. 2008
0 views

Courseintro

FAQ Presentation
24. 01. 2008
0 views

FAQ Presentation

CMS update
12. 02. 2008
0 views

CMS update

Brian Steele
28. 01. 2008
0 views

Brian Steele

crypto f05 s2
29. 01. 2008
0 views

crypto f05 s2

writing varner
06. 02. 2008
0 views

writing varner

The Maya
07. 02. 2008
0 views

The Maya

Fichner Rathus CH12
12. 02. 2008
0 views

Fichner Rathus CH12

bristol
14. 02. 2008
0 views

bristol

pps 310
14. 02. 2008
0 views

pps 310

LCR02
15. 02. 2008
0 views

LCR02

burton RESTEasy
21. 02. 2008
0 views

burton RESTEasy

Glaucoma
25. 02. 2008
0 views

Glaucoma

festival on a budget
27. 02. 2008
0 views

festival on a budget

Projection Systems Ortho and Iso
09. 01. 2008
0 views

Projection Systems Ortho and Iso

Slide Presentation
28. 02. 2008
0 views

Slide Presentation

Age Of Enlightenment
03. 03. 2008
0 views

Age Of Enlightenment

JobPostings
11. 03. 2008
0 views

JobPostings

ESCI101 26 Groundwater1
12. 03. 2008
0 views

ESCI101 26 Groundwater1

79 3843 6 1950s Powerpoint
19. 03. 2008
0 views

79 3843 6 1950s Powerpoint

Operating Systems ofthe Home
10. 01. 2008
0 views

Operating Systems ofthe Home

climate transport brazil
25. 03. 2008
0 views

climate transport brazil

garetiree
07. 02. 2008
0 views

garetiree

LUENTO3Embryo development
10. 03. 2008
0 views

LUENTO3Embryo development

Woolly Monkey Research
31. 03. 2008
0 views

Woolly Monkey Research

nixonforeignpolicy JoshR BenK
03. 04. 2008
0 views

nixonforeignpolicy JoshR BenK

bahai
07. 04. 2008
0 views

bahai

Chapter 13 Global Clim
27. 03. 2008
0 views

Chapter 13 Global Clim

nach31d fuzeon vortr
28. 03. 2008
0 views

nach31d fuzeon vortr

d04 vp matousek
15. 04. 2008
0 views

d04 vp matousek

red binder pages
14. 04. 2008
0 views

red binder pages

KULDA Training 0405
23. 01. 2008
0 views

KULDA Training 0405

3 eReturn to work
29. 01. 2008
0 views

3 eReturn to work

slides trouble with tanning beds
04. 02. 2008
0 views

slides trouble with tanning beds

faith based focus group
13. 01. 2008
0 views

faith based focus group

pogorelova
14. 02. 2008
0 views

pogorelova

2 Trevor
16. 01. 2008
0 views

2 Trevor

goldstein 6th c7 editedW06
14. 01. 2008
0 views

goldstein 6th c7 editedW06

scenarios candice
28. 01. 2008
0 views

scenarios candice

histrespr2007
28. 01. 2008
0 views

histrespr2007

MontrealEngineering5 5 03
25. 01. 2008
0 views

MontrealEngineering5 5 03

ithaca presentation
17. 01. 2008
0 views

ithaca presentation

rapport medarbetarenkat 06
07. 02. 2008
0 views

rapport medarbetarenkat 06

2hmr theme1
15. 01. 2008
0 views

2hmr theme1

almy ieee
11. 01. 2008
0 views

almy ieee

DAMM Presentation Businet
13. 01. 2008
0 views

DAMM Presentation Businet

odrecva
05. 02. 2008
0 views

odrecva

Lecture4metabolism
23. 01. 2008
0 views

Lecture4metabolism

20060608 NAT2006
20. 02. 2008
0 views

20060608 NAT2006

Amarger Hitachi
08. 04. 2008
0 views

Amarger Hitachi

Tim Riedel
24. 01. 2008
0 views

Tim Riedel

jmajor022206
11. 02. 2008
0 views

jmajor022206