OVERVIEW OF MELCOR ACTIVITIES IN CIEMAT (2012) · European MELCOR User Group, 2013 Unit of Nuclear...
Transcript of OVERVIEW OF MELCOR ACTIVITIES IN CIEMAT (2012) · European MELCOR User Group, 2013 Unit of Nuclear...
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
OVERVIEW OF MELCOR ACTIVITIES
IN CIEMAT (2012)
C. López, M. García, E. Fernández, L.E. Herranz
Unit of Nuclear Safety Research
CIEMAT, SPAIN
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
Scenarios Addressed
• Plant analysis
Spanish NPP (CSN) MELCOR 2.1
• Fuel degradation in the presence of air
SFP (OECD-SFP project) MELCOR 1.8.6 YV 3084 SFP
BWR:
Spanish NPP (ARTIST-Ext ) MELCOR 2.1
PWR:
BSAF (CSN, OECD project) MELCOR 2.1
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
Plant analysis BWR, PWR
1.8.4 1.8.5 1.8.6 2.1���� SNAP���� SNAP
�COR�Converter�COR�Converter
��
Inputs updating:
Automatic conversion to 2.1:
• MELGEN ����
• MELCOR ���� “by hand”
Automatic conversion to 2.1:
• MELGEN ����
• MELCOR ���� “by hand”
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
Execution
M2.1.3226 M2.1.4206 M2.1.4803
BWR ���� ���� ����
PWR ���� ���� ����
Post-processing:
PTFread1.76.xla ���� ���� ����
PTFread1.77.xla ���� ���� ����
PTFread *.xlam Not supported (Office 2003)
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
• Corruption of files sent by e-mail:
license.request → *.zip
• Post-processing of MELCOR 2.1 case with PTFread1.76:
- water density
Others:
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 10 20 30 40
time [hr]
Mas
s [k
g/m
**3]
CVH-RHO.1.200
Output ����Output ����
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
1.E-02
1.E+01
1.E+04
1.E+07
1.E+10
1.E+13
0 5 10 15 20time [hr]
Mas
s [k
g]
RN2-DFBBT-22-aRN2-DFBBT-152-aRN2-DFBBT-10-aEstimate DF pool
• Corruption of files sent by e-mail:
license.request → *.zip
• Post-processing of MELCOR 2.1 case with PTFread1.76:
- water density
- Cumulative DF
SRV: FL 362
DC: FL 20
Others:
RN2-DFBBT-3622-a?RN2-DFBBT-202-a?RN2-DFBBT-3622-a?RN2-DFBBT-202-a?
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
• Corruption of files sent by e-mail:
license.request → *.zip
• Post-processing of MELCOR 2.1 case with PTFread1.76:
- water density
- Cumulative DF
Others:
?
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
THANK YOU FOR YOUR ATTENTION!!
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
SBOIC11
SBOnoICSBOICad SBOSVSBOSRVop
IC S-RVs
LOOPIC11
1. BWR: CSN Spanish NPPBWR-Mark I
1400 MWth
Systems analyses:Unit 1 Fukushima-like scenario
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
Core &
RPVPCV
ReactorBuilding
Total
COR cells 41 - - 41
CVs 6 3 11 20
FLs 8+5 4+3 15 35
HSs 14 7 25 46
Z1: 0.00
Z2: 0.884
Z3: 2.371
Z4: 3.105
Z5: 3.840
Z6: 4.575
Z7: 4.715
Z8: 5.204
Z9: 6.100
Z10: 6.997
Z11: 7.894
Z12: 8.791
9.185
4
CV 330Bypass
CV 340Core
Channel
CV 320Lower Plenum
BAF
TAF
SRVs
SVs ���� FL (Valve, TF)
Failures
IC ���� CF (Steam Sink)
(Water Source)
1. BWR: CSN
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
0
0.1
0.2
0.3
0.4
0.5
0.6
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20time (h)
DW
pre
ssu
re (
MP
a)
SBO_IC11
SBO_ICad
WW vent open
IC Effect SV Effect
Time shift
IC performance → late and slower degradation of fuel.
→ similar Containment evolution
0
0.1
0.2
0.3
0.4
0.5
0.6
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
time (h)D
W P
ress
ure
(M
pa)
SBO_IC11SBO_SV
Steam
Non condensable
DW FailDW Fail + Vent
SV operation → similar fuel degradation.
→ different Containmentevolution.
1. BWR: CSN
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
2. BWR: CSN, BSAF ProjectStarting point: previous BWR NPP
• Detailed plant model
COR: 4 x 13
BAF
TAF
COR: 3 x 12
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
WW DW
2. BWR: CSN, BSAF Project
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
Input development of the 3 NPP→ Excel worksheet
2. BWR: CSN, BSAF Project
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
Focus: Implementation of the ARI3SG correlation in MELCOR 2.1:
3. PWR: ARTIST-Ext Project
Scope: -“Near field” deposition (break stage)
-“Dry conditions” (no pool scrubbing)
4
12
12
p
TBStk
StkRe
009.0exp47.0 ⋅
⋅−⋅=η
~20
m
Objective: Aerosol retention in the Secondary Side of a Steam Generator.
ARI3SG
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
Scenario:SGTR:
- Double-ended rupture SG.
-SG PORV failed Open.
-Bypass sequence.
3. PWR: ARTIST-Ext Project
Spanish PWR: 2614 MWth3 loops
- Filter implementation
by Control Function
Approach:
ARI3SG
Filter
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40Time (h)
cp1_CVH-LIQLEV.300
SG Top
SG BottomTube breach
Top tube bundle
0
2
4
6
8
10
12
14
16
18
20
0
SG
wat
er le
vel (
m)
SG BottomTube breach
3. PWR: ARTIST-Ext Project
Dry
ONGOING ANALYSES
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
SFP tests:
• Complete LOCA in SFPools• BWR/PWR fuel assemblies• Zr air oxidation leading to cladding ignition
2 Scenarios modeled:
4. SFP: OECD-SFP Project
• 1x1
• 1x4
1x1:
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
SFP-PWR 1X4
GasCirculation
NaturalConvection
ForcedConvection
Measurements
Zero rates (R2)
Materialproperties
Radiationmodeling
Materialemissivities
Viewfactors
Systemproperties
Cp: MgO, SS, Al
ZrO2thickness
Gapthickness
Rackas HS
SS, ZrO2
Arbitraryradiation paths
(NNHTR)CL-1 → RK-1 → CL-2 → RK-2
Gap modelCL inner surf.emissivity set
to zero
FCELRFSSCN
Low values ���� ignition in R1
4. SFP:
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European MELCOR User Group, 2013
Stockholm, May 2 - 3, 2013Unit of Nuclear Safety Research
PWR 1x1PWR 1x1 PWR 1x4PWR 1x4
4. SFP: OECD-SFP Project
Center
• The ignition onset time well captured.• Discrepancies on ignition onset location or propagation.• The ignition onset time well captured.• Discrepancies on ignition onset location or propagation.