Post on 17-Apr-2020
1
Nodalisation and Visualisation
of VVER440/V213 core
2nd EUMUG
SUJB, Prague
1 – 2 March 2010
Juraj Jančovič, Peter Juriš
jancovic@vuje.sk, juris@vuje.sk
2
Motivation
Approach
Development of a brand new nodalisation
Intensified activities to join CSARP/MCAP
Model verification using RELAP5 code calculations and comparison
with ASTEC code results
Development of in-vessel core behaviour visualisation
Development of a new model for PSA L2 analyses (1471.25 MWt)
Detailed core nodalisation, 3-loop primary circuit model
MELCOR 1.8.5 version of the code used
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MELCOR 1.8.5 model
Integral model allowing modelling of a scenario from initiating event up to both in-vessel and ex-vessel phase of severe accidents
Capable of source term calculation, including source term time history in time period 0 s – 172 800 s (2 days)
Steam generator tube creep rupture model evaluated
MELCOR 1.8.5 model
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VVER440 RPV/core
5
1. CV004 DOWNCOMMER 2. CV009 LP-BEZ_UO2 3. CV010 DZK_R12_A69 4. CV011 DZK_R3_A69 5. CV012 DZK_R45_A69 6. CV013 DZK_R6_A69 7. CV014 DZK_R7_A69 8. CV015 AZ_R12_A1012 9. CV016 AZ_R3_A1012 10. CV017 AZ_R45_A1012 11. CV018 AZ_R6_A1012 12. CV019 AZ_R7_A1012 13. CV020 AZ_R12_A1315 14. CV021 AZ_R3_A1315 15. CV022 AZ_R45_A1315 16. CV023 AZ_R6_A1315 17. CV024 AZ_R7_A1315 18. CV025 AZ_R12_A1619 19. CV026 AZ_R3_A1619 20. CV027 AZ_R45_A1619 21. CV028 AZ_R6_A1619 22. CV029 AZ_R7_A1619 23. CV040 HZK 24. CV041 PodVekomValec 25. CV042 PodVekomPolgula
9,54 m
CV004
FL049 FL048
11,92 m CV042
13,652 m
CV040
FL028 FL029 FL025 FL026 FL027
7,495 m
CV
029
FL023 FL024 FL020
CV025 CV026 CV027 CV028
FL021 FL022
6,320 m
CV
024
FL018 FL019 FL015
CV020 CV021 CV022 CV023
FL016 FL017
5,390 m
FL010
CV017 CV018
CV
019
FL011 FL012 FL013 FL014
4,563 m
FL
032
FL0
32
FL
034
FL0
34
FL005
CV010 CV011 CV012 CV013
CV
014
FL006 FL007 FL008 FL009
FL
031
FL0
31
FL
033
FL0
33
2,203 m
0,284 m
FL004 CV009
FL046 FL047
10,808 m CV041
REAKTOR
3,9 m
2,4 m
3,9 m
2,4 m
FL108 FL109 CV110
8,472 m
9,872 m
10,368 m
9,996 m
10,244 m
HS00064hemisph.
2,763 m
3,213 m
1,653 m
2,203 m
4,77 m
5,08 m
HS
00
00
1c
HS
00
00
2c
HS00003c
HS00004c
HS00005c
HS00006c 3,663 m
HS
00
06
1c
HS00008c
HS00009c
HS00010c
HS00011c
5,70 m HS00012c
6,01 m HS00013c
CV164
8,968 m
8,472 m
FL165 FL166
8,596 m
8,844 m
HS00014c
HS00015c
HS00016c
HS00017c 7,25 m
6,94 m
6,63 m
HS00021r
HS00022r
HS00023r
HS00024r
HS00025r
1,653 m
HS
00
04
0c
HS
00
04
5c
7,695 m
HS
00
06
2c
9,54 m
HS00043r
HS
00
04
1c
11,636 m
11,845 m
HS
00
04
6c
HS
00
04
7c
HS
00
04
9c
10,9 m
11,44 m
11,84 m
HS
00
04
4c
HS
00
06
3c
HS
00
04
2c
HS
00
05
0c
HS
00
04
8c
12,685 m
12,485 m 13,569 m
12,2 m
HS00051r 12,6 m
4,113 m HS00007c
1,653m
1,653m
FL0
41
FL0
42
FL0
43
FL0
44
5,0m
FL0
38
FL0
38
CV015 CV016
FL0
35
FL0
35
5,0m
6,0m
FL0
36
FL0
36
6,0m
FL0
39
FL0
39
7,0m
FL0
37
FL0
37
7,0m
FL0
40
FL
040
5,0m 5,0m
7,0m 7,0m
6
7
8
Difference due to “after scram geometry” modeling
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Visualisation of core:
Shows evolution of core degradation
It is run in MS EXCEL
Used in verification of calculations and as a required outputfor PSA L2 scenario description and documentation.
Uses plot file output
Core visualisation
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Core visualisation
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Core visualisation
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Visualisation observations
All mass from core ejected from RPV
I some cases there are large differences in temperatureof neighbouring cells
Lower support plate can fail even when submerged in water (with TSFAIL option at 1273 K)
Prolongation of cladding without fuel can support debrisand prevent it falling onto support plate for some time
Visualisation
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Bugs and experience
CFs creep model „ghostly“ crashes when experiencing negative pressure
Just four valid numbers in RN package (40 030 kg vs. 5.108 kg)
Some test scenarios with vessel flooded experienced large RN class mass numerical error up to ~ 9%
Core crashes with not sufficient explanation, example:
RN package error ...... in VOLUM
Bugs and experience
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Nodalisation and visualisation of core
New nodalisation (along with 3loop PC/SC and ~50 volume containment) reaches addressable memory limits; not a single flow path can be added
Visualisation puts together essential core parameters into one picture
Core composition and relations between components easily seen
Conclusions