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Analyses of SA sequences in the SFP of the VVER-1000 type of reactor with

MELCOR 1.8.6

Focus on modeling approach and encountered problems

Miroslav Kotouč

ÚJV Řež, a. s.

The 6 th Meeting of the “European MELCOR User Group”

Bratislava, Slovakia, April 15-16, 2014

(2)

SFP layout

CHannel

BYpass Absorber

tubes (racks) grid B02

B01 B03

Spent fuel pools Reactor pit

Reactor shaft

Revision shafts Transportation

cask pit

Gates

Gates (open)

B02 B01 B03

Absorber tube (rack) FA

Upper plate Lower

plate Support

plate

Supports

(3)

COR nodalization: COR cells

B02 B03 B01

20 axial levels

9 radial rings (2 + 3 + 3)

(4)

COR nodalization: + FU

(5)

COR nodalization: + CL

B02 B03 B01

CL – cladding, spacer grids

CORijjDX record for ‘supporting’

qualities of the grids

2 Inconel grids

(6)

COR nodalization: + SS

SS – support plate, upper & lower

plate (BY), supports, FAs nozzles

(7)

COR nodalization: + NS

B02 B03 B01

NS – guide & central tubes

(8)

COR nodalization: + CN

‘BWR’ type of reactor

CN – absorber tubes (racks)

BY where CN exists

(9)

COR nodalization: + LH

B02 B03 B01

8 mm stainless steel 8 mm carbon steel

1.2 m concrete (insulation)

(10)

COR nodalization: + BHS

(11)

CVH nodalization: CVs + COR cells

B02 B03 B01

(12)

CVH nodalization: CVs

(13)

CVH nodalization: CVs + FLs

B02 B03 B01

ring ‘i’ ring ‘j’

le ve l‘ k’

CHannel BYpass

COR00003(FCELR) = 0.0 => CORHTRxx

heat exchange surface area

(14)

CVH nodalization: CVs + FLs (CN collapsed)

ring ‘i’ ring ‘j’

le ve l‘ k’

CHannel BYpass

(15)

CVH nodalization: CVs + FLs (CN-CN collapsed)

B02 B03 B01

ring ‘i’ ring ‘j’

le ve l‘ k’

CHannel BYpass

(16)

CVH nodalization: CVs + FLs (wall melt-through)

Walls melt-through

B02 B01 B03

(17)

SFP nodalization: CVs + FLs + HSs

(18)

CAV nodalization: CAV01 adjacent to B02

B02

(19)

CAV nodalization: CAV02 adjacent to B03

B03

(20)

CAV nodalization: CAV03 adjacent to B01

B01

(21)

Radial rings (B02): decay power distribution

1 2 3 4 5 6 7 8 9

20 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 19 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 18 5.94E-03 1.15E-06 3.15E-03 1.59E-05 3.36E-06 3.04E-03 1.74E-05 6.75E-06 0.00E+00 17 1.96E-02 3.78E-06 1.04E-02 5.27E-05 1.11E-05 1.00E-02 5.75E-05 2.23E-05 0.00E+00 16 3.30E-02 6.37E-06 1.75E-02 8.87E-05 1.87E-05 1.69E-02 9.68E-05 3.76E-05 0.00E+00 15 3.62E-02 6.98E-06 1.92E-02 9.72E-05 2.05E-05 1.85E-02 1.06E-04 4.12E-05 0.00E+00 14 3.53E-02 6.80E-06 1.87E-02 9.47E-05 1.99E-05 1.81E-02 1.03E-04 4.01E-05 0.00E+00 13 3.39E-02 6.54E-06 1.80E-02 9.11E-05 1.92E-05 1.74E-02 9.94E-05 3.86E-05 0.00E+00 12 3.31E-02 6.39E-06 1.76E-02 8.89E-05 1.87E-05 1.70E-02 9.71E-05 3.77E-05 0.00E+00 11 3.32E-02 6.40E-06 1.76E-02 8.92E-05 1.88E-05 1.70E-02 9.73E-05 3.78E-05 0.00E+00 10 3.40E-02 6.55E-06 1.80E-02 9.12E-05 1.92E-05 1.74E-02 9.96E-05 3.86E-05 0.00E+00 9 3.55E-02 6.85E-06 1.88E-02 9.54E-05 2.01E-05 1.82E-02 1.04E-04 4.04E-05 0.00E+00 8 3.76E-02 7.24E-06 1.99E-02 1.01E-04 2.12E-05 1.92E-02 1.10E-04 4.27E-05 0.00E+00 7 3.97E-02 7.66E-06 2.11E-02 1.07E-04 2.25E-05 2.03E-02 1.16E-04 4.52E-05 0.00E+00 6 4.04E-02 7.79E-06 2.14E-02 1.08E-04 2.29E-05 2.07E-02 1.18E-04 4.59E-05 0.00E+00 5 3.60E-02 6.94E-06 1.91E-02 9.66E-05 2.04E-05 1.84E-02 1.05E-04 4.09E-05 0.00E+00 4 2.45E-02 4.72E-06 1.30E-02 6.57E-05 1.38E-05 1.25E-02 7.17E-05 2.78E-05 0.00E+00 3 9.90E-03 1.91E-06 5.25E-03 2.66E-05 5.60E-06 5.07E-03 2.90E-05 1.13E-05 0.00E+00 2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

(22)

Radial rings (B03): decay power distribution

1 2 3 4 5 6 7 8 9

20 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 19 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 18 5.94E-03 1.15E-06 3.15E-03 1.59E-05 3.36E-06 3.04E-03 1.74E-05 6.75E-06 0.00E+00 17 1.96E-02 3.78E-06 1.04E-02 5.27E-05 1.11E-05 1.00E-02 5.75E-05 2.23E-05 0.00E+00 16 3.30E-02 6.37E-06 1.75E-02 8.87E-05 1.87E-05 1.69E-02 9.68E-05 3.76E-05 0.00E+00 15 3.62E-02 6.98E-06 1.92E-02 9.72E-05 2.05E-05 1.85E-02 1.06E-04 4.12E-05 0.00E+00 14 3.53E-02 6.80E-06 1.87E-02 9.47E-05 1.99E-05 1.81E-02 1.03E-04 4.01E-05 0.00E+00 13 3.39E-02 6.54E-06 1.80E-02 9.11E-05 1.92E-05 1.74E-02 9.94E-05 3.86E-05 0.00E+00 12 3.31E-02 6.39E-06 1.76E-02 8.89E-05 1.87E-05 1.70E-02 9.71E-05 3.77E-05 0.00E+00 11 3.32E-02 6.40E-06 1.76E-02 8.92E-05 1.88E-05 1.70E-02 9.73E-05 3.78E-05 0.00E+00 10 3.40E-02 6.55E-06 1.80E-02 9.12E-05 1.92E-05 1.74E-02 9.96E-05 3.86E-05 0.00E+00 9 3.55E-02 6.85E-06 1.88E-02 9.54E-05 2.01E-05 1.82E-02 1.04E-04 4.04E-05 0.00E+00 8 3.76E-02 7.24E-06 1.99E-02 1.01E-04 2.12E-05 1.92E-02 1.10E-04 4.27E-05 0.00E+00 7 3.97E-02 7.66E-06 2.11E-02 1.07E-04 2.25E-05 2.03E-02 1.16E-04 4.52E-05 0.00E+00 6 4.04E-02 7.79E-06 2.14E-02 1.08E-04 2.29E-05 2.07E-02 1.18E-04 4.59E-05 0.00E+00 5 3.60E-02 6.94E-06 1.91E-02 9.66E-05 2.04E-05 1.84E-02 1.05E-04 4.09E-05 0.00E+00 4 2.45E-02 4.72E-06 1.30E-02 6.57E-05 1.38E-05 1.25E-02 7.17E-05 2.78E-05 0.00E+00 3 9.90E-03 1.91E-06 5.25E-03 2.66E-05 5.60E-06 5.07E-03 2.90E-05 1.13E-05 0.00E+00 2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

(23)

Radial rings (B01): decay power distribution

1 2 3 4 5 6 7 8 9

20 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 19 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 18 5.94E-03 1.15E-06 3.15E-03 1.59E-05 3.36E-06 3.04E-03 1.74E-05 6.75E-06 0.00E+00 17 1.96E-02 3.78E-06 1.04E-02 5.27E-05 1.11E-05 1.00E-02 5.75E-05 2.23E-05 0.00E+00 16 3.30E-02 6.37E-06 1.75E-02 8.87E-05 1.87E-05 1.69E-02 9.68E-05 3.76E-05 0.00E+00 15 3.62E-02 6.98E-06 1.92E-02 9.72E-05 2.05E-05 1.85E-02 1.06E-04 4.12E-05 0.00E+00 14 3.53E-02 6.80E-06 1.87E-02 9.47E-05 1.99E-05 1.81E-02 1.03E-04 4.01E-05 0.00E+00 13 3.39E-02 6.54E-06 1.80E-02 9.11E-05 1.92E-05 1.74E-02 9.94E-05 3.86E-05 0.00E+00 12 3.31E-02 6.39E-06 1.76E-02 8.89E-05 1.87E-05 1.70E-02 9.71E-05 3.77E-05 0.00E+00 11 3.32E-02 6.40E-06 1.76E-02 8.92E-05 1.88E-05 1.70E-02 9.73E-05 3.78E-05 0.00E+00 10 3.40E-02 6.55E-06 1.80E-02 9.12E-05 1.92E-05 1.74E-02 9.96E-05 3.86E-05 0.00E+00 9 3.55E-02 6.85E-06 1.88E-02 9.54E-05 2.01E-05 1.82E-02 1.04E-04 4.04E-05 0.00E+00 8 3.76E-02 7.24E-06 1.99E-02 1.01E-04 2.12E-05 1.92E-02 1.10E-04 4.27E-05 0.00E+00 7 3.97E-02 7.66E-06 2.11E-02 1.07E-04 2.25E-05 2.03E-02 1.16E-04 4.52E-05 0.00E+00 6 4.04E-02 7.79E-06 2.14E-02 1.08E-04 2.29E-05 2.07E-02 1.18E-04 4.59E-05 0.00E+00 5 3.60E-02 6.94E-06 1.91E-02 9.66E-05 2.04E-05 1.84E-02 1.05E-04 4.09E-05 0.00E+00 4 2.45E-02 4.72E-06 1.30E-02 6.57E-05 1.38E-05 1.25E-02 7.17E-05 2.78E-05 0.00E+00 3 9.90E-03 1.91E-06 5.25E-03 2.66E-05 5.60E-06 5.07E-03 2.90E-05 1.13E-05 0.00E+00 2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

(24)

Scenario example: LOCA

(25)

Debris exclusion: CORijjDX(FCHXRD)

Component presence Volume blocked

1 20

0.0

19

1.0

18

1.0

17

1.0

16

1.0

15

1.0

14

1.0

13

1.0

12

1.0

11

1.0

10

1.0

9

1.0

8

1.0

7

1.0

6

1.0

5

1.0

4

1.0

3

1.0

2

1.0

1

0.0

1

20

0.0

19

0.5

18

0.9

17

0.9

16

1.0

15

0.9

14

1.0

13

0.9

12

1.0

11

0.9

10

1.0

9

0.9

8

1.0

7

0.9

6

1.0

5

0.9

4

1.0

3

0.9

2

0.5

1

0.0

(26)

Debris exclusion: CORijjDX(FBYXCN)

Component presence Volume blocked

1 20

0.0

19

0.0

18

0.0

17

1.0

16

1.0

15

1.0

14

1.0

13

1.0

12

1.0

11

1.0

10

1.0

9

1.0

8

1.0

7

1.0

6

1.0

5

1.0

4

1.0

3

1.0

2

0.0

1

20

0.0

19

0.0

18

0.0

17

0.3

16

0.3

15

0.3

14

0.3

13

0.3

12

0.3

11

0.3

10

0.3

9

0.3

8

0.3

7

0.3

6

0.3

5

0.3

4

0.3

3

0.3

2

0.0

(27)

Debris exclusion: CORijjDX(FBYXSS)

Component presence Volume blocked

1 20

1.0

19

0.0

18

0.0

17

1.0

16

0.0

15

0.0

14

0.0

13

0.0

12

0.0

11

0.0

10

0.0

9

0.0

8

0.0

7

0.0

6

0.0

5

0.0

4

1.0

3

1.0

2

1.0

1

1.0

1

20

0.0

19

0.0

18

0.0

17

0.7

16

0.0

15

0.0

14

0.0

13

0.0

12

0.0

11

0.0

10

0.0

9

0.0

8

0.0

7

0.0

6

0.0

5

0.0

4

0.7

3

0.0

2

0.0

1

0.0

(28)

Debris exclusion: CORijjDX – all together (add?!)

Volume blocked

20 19 18

17 0.9 1.0 16 1.0 0.3 15 0.9 0.3 14 1.0 0.3 13 0.9 0.3 12 1.0 0.3 11 0.9 0.3 10 1.0 0.3 9 0.9 0.3 8 1.0 0.3 7 0.9 0.3 6 1.0 0.3 5 0.9 0.3 4 1.0 1.0 3 0.9 0.3 2 0.5

0.9 0.0 0.5

1

(29)

Debris exclusion: NS fail

Volume blocked

20 19 18

17 0.9 1.0 16 1.0 0.3 15 0.9 0.3 14 1.0 0.3 13 0.9 0.3 12 1.0 0.3 11 0.9 0.3 10 1.0 0.3 9 0.9 0.3 8 1.0 0.3 7 0.9 0.3 6 1.0 0.3 5 0.9 0.3 4 1.0 1.0 3 0.9 0.3 2

1 0.0 0.5 0.9 0.0 0.5

1

NS (i.e. guide tube) failure

set to T = 1 500 K (due to

eutectics of ZR and SS

where 2 tubes coexist)

(30)

Debris exclusion: CORijjDX – all together, NS fail

Volume blocked

20 19 18

17 0.9 1.0 16 1.0 0.3 15 0.9 0.3 14 1.0 0.3 13 0.9 0.3 12 1.0 0.3 11 0.9 0.3 10 1.0 0.3 9 0.9 0.3 8 1.0 0.3 7 0.9 0.3 6 1.0 0.3 5 0.9 0.3 4 1.0 1.0 3 0.9 0.3 2 0.5

0.9 0.0 0.5

1

(31)

NS fail – just before failure

NS SS CL

FU

CN

(32)

NS fail – just after failure

FU

CN

SS

CL

(33)

Debris exclusion: CORijjDX – COR cell #119

Volume blocked

20 19 18

17 0.9 1.0 16 1.0 0.3 15 0.9 0.3 14 1.0 0.3 13 0.9 0.3 12 1.0 0.3 11 0.9 0.3 10 1.0 0.3 9 0.9 0.3 8 1.0 0.3 7 0.9 0.3 6 1.0 0.3 5 0.9 0.3 4 1.0 1.0 3 0.9 0.3 2

1 0.0 0.5 0.9 0.0 0.5

1

Volume blocked Fluid part

Components

(34)

Debris exclusion: CORijjDX – COR cell #118

Volume blocked

20 19 18

17 0.9 1.0 16 1.0 0.3 15 0.9 0.3 14 1.0 0.3 13 0.9 0.3 12 1.0 0.3 11 0.9 0.3 10 1.0 0.3 9 0.9 0.3 8 1.0 0.3 7 0.9 0.3 6 1.0 0.3 5 0.9 0.3 4 1.0 1.0 3 0.9 0.3 2 0.5

0.9 0.0 0.5

1

Volume blocked Fluid part

Components

(35)

Debris exclusion: CORijjDX – COR cell #117

Volume blocked

20 19 18

17 0.9 1.0 16 1.0 0.3 15 0.9 0.3 14 1.0 0.3 13 0.9 0.3 12 1.0 0.3 11 0.9 0.3 10 1.0 0.3 9 0.9 0.3 8 1.0 0.3 7 0.9 0.3 6 1.0 0.3 5 0.9 0.3 4 1.0 1.0 3 0.9 0.3 2

1 0.0 0.5 0.9 0.0 0.5

1

CHannel BYpass

BY volume blocked BY fluid part

CH fluid part

CH volume blocked

(36)

Conclusions

Use of the CORijjDX record for structures’ supporting capabilities is unclear

Supporting structure (SS) rather to be used for spacer grids

(37)

Other matters

Total decay heat calculated by DCH and RN packages differ for LB LOCA scenarios (where huge MPs exist)

not for SBO scenarios (MPs partially suppressed)

Remede: CORTST01(IMPMOD) = 1, CORTST01(IMPPRT) = 1 Bugzilla: #1260

MELCOR download page down (new releases of MELCOR 2.1, ptfread)

Time [10

3

s]

D e ca y p o w e r [M W ]

(38)

UJV GROUP

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