Utilisation of Gd II Fuel Assemblies at Bohunice NPP Unit … · Utilisation of Gd II Fuel...

Utilisation of Gd II Fuel Assemblies at Bohunice

NPP Unit 3, 4

O. Grežďo, M. Kačmar 9/2006

16th AER Symposium of AER on WWER Reactor Physic and Reactor safetySeptember 25-29,2006,Bratislava,Slovakia

1

SLOVENSKÉELEKTRÁRNE

Contents

1. Brief summary of Bohunice V-2 (3. and 4. unit) NPP fuel cycle

2. Gd II fuel licensing

3. Consequences of Gd II fuel utilization

4. First experience with new fuel with burnable absorber and upgraded

core monitoring system

5. Conclusion

2


1. Brief summary of Bohunice V-2 (3. and 4. unit) NPP fuel cycle

In the fig. 1. you can see evolution of nuclear fuel cycle in Bohunice V-2 up to the moment. This changes results in better nuclear fuel cycle economy and reduction of neutron flux on reactor vessel.

The close changes of fuel cycle is expected in connection with increase of the reactor power:-104% (2008 3.unit)-105%(2009 4.unit) -107%(2010 3 and 4. unit).

Number of leakage assemblies is in the fig.2

2.Gd II fuel licensing for 3. and 4. unit Bohunice NPP

Choice of supplier and fuel licensing took aproximately four years. Regulatory authority accept new fuel 26 months after contract was signed. If we want prepare new contract in 2011 year(current contract is valid to 2010), we dont have a lot of time.

3


3. Consequences of Gd II fuel utilization

3.1Change of operational limits and conditions

Power distribution

both and kq ≤ 1,8 - for 1.generation fuel

both and kr ≤ 2,2 - for 1.generation fuel

both and kr ≤ 2,2 - for 2.generation fuel

NNk dovq 40,1≤

NN

60,1k dovr ≤

NN

66,1k dovr ≤

4


M a x i m á l n y d o v o l e n ý l i n e á r n y v ý k o n p a l i v o v é h o p r ú t i k a v z á v i s l o s t i n a v y h o r e n í p a l i v o v é h o p r ú t i k a

1 7 0

1 8 0

1 9 0

2 0 0

2 1 0

2 2 0

2 3 0

2 4 0

2 5 0

2 6 0

2 7 0

2 8 0

2 9 0

3 0 0

3 1 0

0 1 0 2 0 3 0 4 0 5 0 6 0 7 0V y h o r e n ie p a l iv o v é h o p r ú t ik a [ M W d /k g U ]

ql m

ax [W

/cm

]

2 9 1

2 5 5

1 9 2

1 7 9

Maximal linear power of fuel element

Maximal linear power of fuel element in dependance on fuel element burn up

Fuel element burn up [MWd/kg]

5


Working CA group position

0

25

50

75

100

125

150

175

200

225

250

0 10 20 30 40 50 60 70 80 90 100

Power [%Nnom]

Wor

king

gro

up C

A p

ositi

on [c

m]

Minimálna dovolená poloha 6.skupiny HRK v ustálenom stave

Minimálna dovolená poloha 6.skupiny HRK v prechodovom stave

Maximálna dovolená poloha 6.skupiny HRK v ustálenom aj prechodovom stave

100, 215

100, 250

80, 125

50, 215

100, 195

2, 50

minimal position sixth group of CA (stable state)

minimal position sixth group of CA (unstable state)

minimal position sixth group of CA (stable and unstable state)

6


System SCORPIO evaluates signals from temperature and neutron detectors placed in the reactor and gives information about the core power distribution to the reactor operator and physicists.

Main functions of CMS SCORPIO:

- Processing of mesurement data - Temperature sensor calibration- 3-D power distribution reconstruction- Limit checking and termal margin calculation- Calculation of margin to PCI- Primary circuit coolant activity monitoring- Reactivity measurement during start-up- Predictive mode and strategic planning- Automated set up for new cycle- Data archiving

3.2 Core monitoring system(CMS) SCORPIO upgrade

7


Core follow mode provides:

- Monitoring of measured and calculating parameters of reactor, fuel assemblies and fuel pins- Checking the status of the in-core detectors- Evaluation of margins to operational and safety limits and alarm indication- Displaing of the trend curves of selected parameters, display of detailed core map - Displaing the status of each modules- Archiving of selected parameters in the user forms

Core predictive mode (strategy generator)

Core predictive mode provides information for optimization of expected power changes for the 168 hours aheadSystem calculates:

- minimal changes of boron acid concentration during power transients

- power distribution during expected power changes- critical boron concentration- control fuel assembly critical position- shutdown boron concentration

8


Main monitoring (limits) parameters of core:

- Outlet temperature of fuel assemblies- Coolant temperature rises in the fuel assemblies- Radial assembly-wise power peaking factors kq- Pin-wise power peaking factors kr- linear power qlin

Other monitoring parameters of core:- Nodal power peaking factors kv- Nuclear heat flux hot channel factors Fq- Departure from nucleate boiling ratio DNBR-Margin of subchannel output coolant temperature to the saturation temperature tSAT

9


CMS Scorpio software upgrade

- Change from 20/40 calculation point along the height of core to 42 calculation point.- Changes of neutron- physical model as a result of geometric and material changes. - Implementation of diffusion libraries for new fuel type.- KRITEX(Reactivity measurement during start-up) module changes.- STRATEGIC GENERATOR(Predictive mode) module changes- Add an option to do correction of assemblies outlet temperature in dependence on

power distribution profile in Gd II assembly(This option don´t use up to the moment).- Possibility of manual set CA position.

10


4. First experience with new fuel with burnable absorber and upgraded coremonitoring system

Following figures and tables summarize first comparsion between theoretical and „experimental „values.

„experimental“ values – experimental values measured during physical start-up (nonstandardmeasure system)

– values calculated with CMS SCORPIO (MOBYDICK)

theoretical values - values calculated with BIPR-7

11


4.1 Operation with Gd II fuel 22.cycle 4.unit Bohunice NPP

Core loading pattern

2

20

1 3 4 5 6 7 8 9 10

191817161514131211

21 22 23 24 25 26 27

34333231302928

36 37 38 39 40 41

4746

5251504948

45444342

53 54 55 56

57 58

59

35

ENRICHMENT

ENRICHMENT

ENRICHMENT

12


Physical start-up results

Duration: from 13.7.2006 9.24 to 16.7.2006 3.00

Theoretical Experimental Deviation CriteriaCritical concentration H3BO3 in PC [g/kg] 7.78 7.55 -0.22 ±0.4 g/kgAsymetry coeficients min 1 0.964 -0.036 -7%rel

max 1 1.064 0.064 7%relAsyptotic period min - - -13.40% -30%rel

max - - 6.40% 30%rel200 [OC] -0.61 -0.74 0.13 ±0.4*10-2 %/oC210 -0.74 -0.85 0.11 ±0.4*10-2 %/oC220 -0.87 -0.97 0.10 ±0.4*10-2 %/oC

Temperature reactivity coefficient [10-2%/oC] 230 -0.99 -1.11 0.12 ±0.4*10-2 %/oC240 -1.12 -1.26 0.14 ±0.4*10-2 %/oC250 -1.25 -1.44 0.19 ±0.4*10-2 %/oC260 -1.38 -1.65 0.27 ±0.4*10-2 %/oC

CA system total worth [%] 12.5 12.34 1.40% ±21%relCA system total worth with CA 03-46 stuck[%] 8.26 7.68 7.00% ±20%relWorth of "ejected" CA 06-49 [%] 0.52 0.59 -11.90% ±20%relCA drop time [s] 8 to 13 10.2 to 11.6 - from 8 to 13 sBoron acid worth [%kg/g] -1.48 -1.44 2.80% ±17%relWorth of working CA [%] 0.81 0.87 -6.90% ±17%relIsothermal state TČ - < 0.5 < 0.5 < 0.5

OT - < 0.2 < 0.2 < 0.2

13


Graph of boron acid concentration

0

0.5

1

1.5

2

2.5

3

3.5

4

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280

Eff.days

c B [g

/kg]

1000

1200

1400

1600

1800

2000

2200

2400

Pow

er[M

W],C

A6[

mm

]

BIPR

EXP

EXP norm.

Power

CA6

14


Maximal radial assembly-wise power peaking factors kqComparsion BIPR-SCORPIO

11/6

11/6

11/611/6

11/6 21/2

21/6

21/2

21/6

1717

1717171717

17

16

16

1616

16

1616

14

141414

1414

141414

14

14

14

14

21

212121

1.25

1.27

1.29

1.31

1.33

1.35

1.37

1.39

1.41

1.43

1.45

0 50 100 150 200 250 300Eff.days

kq

800

900

1000

1100

1200

1300

1400

1500

kq max I.generation

kq max II.generation

kq max.I.generation BIPR

kq max.I.generation BIPR

power

15


Pin-wise power peaking factors krComparsion BIPR-SCORPIO

1616

16

16

16

16

16

16

16

1616

161717

17/3

17/317/317/317/3

17/3

9/59/59/49/5

9/5

39

3939

3939

39

39

39

39

3939

399

99

9

1.4

1.45

1.5

1.55

1.6

0 50 100 150 200 250

Eff.days

kr

kr max. I.generation BIPR

kr max. I.generation

kr max. II.generation

kr max. II.generation BIPR

16


Maximal linear power qlin

17/3

17/317/317/3

9/59/59/49/4

150

170

190

210

230

250

270

290

0 20 40 60 80 100

Eff.days

qlin

[W/c

m]

I.generation

II.generation

Limit for I.generation

Limit for II.generation

17


Comparsion between experimental(SCORPIO) and teoretical(BIPR) group kq and relative deviation2.eff.days

20.7.2006 Tef = 2.3 eff. days N = 1373 MW CA6 = 240 cm

2

1,2291,236

3

1,1811,205

5

0,9370,976

6

1,1011,113

8

1,2031,209

9

1,2481,253

11

1,3511,364

12

1,1341,152

13

0,9370,981

14

1,3231,332

15

1,0341,062

16

1,3581,352

17

1,3151,308

18

0,9881,006

19

0,2990,289

20

1,1341,151

21

1,3281,34

22

0,9671,006

23

1,0141,034

24

1,1741,176

25

1,3261,312

26

1,1591,139

27

0,4260,422

28

0,9370,98

29

0,9670,999

31

1,1721,168

32

1,3011,283

34

0,5630,562

35

1,3221,324

36

1,0131,04

37

1,1711,166

38

1,0521,074

39

1,2821,274

40

0,8480,818

41

0,2790,275

42

1,0331,065

43

1,1731,187

44

1,2981,281

45

1,281,265

46

0,7920,778

47

0,3330,339

48

1,3551,343

49

1,3221,307

51

0,8420,802

52

0,3330,332

53

1,3131,304

54

1,1541,151

55

0,5350,527

56

0,2780,275

57

0,9870,993

58

0,4290,421

59

0,2970,289

1

0,9680,937

4

0,9860,968

7

1,1021,04

10

0,5480,516

30

1,2961,261

33

1,1291,084

50

1,1221,069

GD II fuel profil. fuel

number of group

kq,SCORPIO

kq,BIPR7

11

0.0000.000

18



2

0,6

3

2,1

5

4,2

6

1,1

8

0,5

9

0,4

11

1

12

1,5

13

4,7

14

0,7

15

2,8

16

-0,5

17

-0,6

18

1,8

19

-3,4

20

1,5

21

0,9

22

4

23

2

24

0,2

25

-1

26

-1,8

27

-0,9

28

4,6

29

3,3

31

-0,4

32

-1,4

34

-0,1

35

0,2

36

2,6

37

-0,4

38

2,1

39

-0,6

40

-3,5

41

-1,2

42

3,1

43

1,2

44

-1,3

45

-1,1

46

-1,8

47

1,8

48

-0,9

49

-1,1

51

-4,8

52

-0,1

53

-0,7

54

-0,3

55

-1,5

56

-1,1

57

0,6

58

-1,7

59

-2,5

1

-3,2

4

-1,9

7

-5,6

10

-5,8

30

-2,7

33

-4

50

-4,8


number of group

rel. deviation = (kq,SCORPIO / kq,BIPR -1) *10011

0.000

19


Comparsion between “experimental”(SCORPIO) and teoretical(BIPR) group kr and relative deviation2.eff.days

20.7.2006 Tef = 2.3 eff.days NR = 1373 MW h6 = 240 cm

2

1,3591,333

3

1,3131,319

5

1,0481,068

6

1,211,19

8

1,321,303

9

1,5021,498

11

1,451,441

12

1,2671,274

13

1,0441,048

14

1,4411,443

15

1,161,172

16

1,5071,469

17

1,5131,465

18

1,3371,355

19

0,4980,466

20

1,2671,274

21

1,4581,457

22

1,0641,076

23

1,1231,12

24

1,321,295

25

1,4831,441

26

1,4681,435

27

0,6810,649

28

1,0441,042

29

1,0641,053

31

1,311,275

32

1,4351,393

34

0,8330,806

35

1,4411,444

36

1,1221,13

37

1,3081,273

38

1,1471,143

39

1,4911,465

40

1,1831,08

41

0,4730,477

42

1,1581,174

43

1,3171,305

44

1,4311,387

45

1,4881,472

46

1,0841,031

47

0,5410,554

48

1,5021,459

49

1,481,436

51

1,1761,059

52

0,5450,545

53

1,511,46

54

1,4621,454

55

0,7910,748

56

0,470,472

57

1,3351,34

58

0,6850,645

59

0,4980,469

1

1,0390,991

4

1,0951,057

7

1,2241,132

10

0,8140,736

30

1,4131,377

33

1,3821,278

50

1,3771,263


number of group

kr,SCORPIO

kr,BIPR7

11

0.0000.000

20



2

-1,9

3

0,4

5

1,9

6

-1,7

8

-1,3

9

-0,3

11

-0,6

12

0,6

13

0,4

14

0,2

15

1

16

-2,5

17

-3,2

18

1,3

19

-6,4

20

0,6

21

-0,1

22

1,1

23

-0,3

24

-1,9

25

-2,8

26

-2,3

27

-4,7

28

-0,2

29

-1

31

-2,7

32

-3

34

-3,3

35

0,2

36

0,7

37

-2,7

38

-0,4

39

-1,8

40

-8,8

41

0,9

42

1,4

43

-0,9

44

-3,1

45

-1,1

46

-4,9

47

2,5

48

-2,9

49

-3

51

-9,9

52

0

53

-3,3

54

-0,6

55

-5,4

56

0,5

57

0,4

58

-5,8

59

-5,7

1

-4,7

4

-3,5

7

-7,6

10

-9,6

30

-2,6

33

-7,5

50

-8,3

GD II fuel profil.fuel

number of group

rel. deviation = (kr,SCORPIO / kr,BIPR -1) *10011

0.000

21



27.8.2006 Tef = 40,4 eff. days NR = 1373 MW h6 = 225 cm

2

1.2051.2

3

1.1641.181

5

0.9420.981

6

1.1021.109

8

1.1861.198

9

1.2521.26

11

1.3271.332

12

1.1271.14

13

0.9410.985

14

1.341.35

15

1.0291.054

16

1.3381.333

17

1.2981.307

18

0.9951.027

19

0.3060.297

20

1.1271.14

21

1.3441.355

22

0.9761.017

23

1.0161.035

24

1.1651.173

25

1.3091.302

26

1.1641.132

27

0.4350.431

28

0.9410.985

29

0.9761.006

31

1.171.167

32

1.2911.273

34

0.570.571

35

1.341.346

36

1.0151.052

37

1.1691.163

38

1.0481.079

39

1.2941.29

40

0.8550.817

41

0.2870.282

42

1.0281.055

43

1.1631.17

44

1.2881.276

45

1.2911.274

46

0.8020.793

47

0.3430.349

48

1.3341.317

49

1.3041.297

51

0.8490.812

52

0.3410.341

53

1.2961.294

54

1.1581.165

55

0.5420.533

56

0.2860.282

57

0.9940.991

58

0.4370.423

59

0.3050.295

1

0.950.909

4

0.9920.964

7

1.0921.027

10

0.5570.528

30

1.3161.276

33

1.1261.082

50

1.1191.074


number of group

kq,SCORPIO

kq,BIPR7

11

0.0000.000

22



номер кассеты

2

0,6

3

2,1

5

4,2

6

1,1

8

0,5

9

0,4

11

1

12

1,5

13

4,7

14

0,7

15

2,8

16

-0,5

17

-0,6

18

1,8

19

-3,4

20

1,5

21

0,9

22

4

23

2

24

0,2

25

-1

26

-1,8

27

-0,9

28

4,6

29

3,3

31

-0,4

32

-1,4

34

-0,1

35

0,2

36

2,6

37

-0,4

38

2,1

39

-0,6

40

-3,5

41

-1,2

42

3,1

43

1,2

44

-1,3

45

-1,1

46

-1,8

47

1,8

48

-0,9

49

-1,1

51

-4,8

52

-0,1

53

-0,7

54

-0,3

55

-1,5

56

-1,1

57

0,6

58

-1,7

59

-2,5

1

-3,2

4

-1,9

7

-5,6

10

-5,8

30

-2,7

33

-4

50

-4,8


number of group


0.000

23



27.8.2006 Tef = 40,4 eff.days NR = 1373 MW h6 = 225 cm

2

1.3321.308

3

1.2831.296

5

1.0561.084

6

1.2031.192

8

1.2951.3

9

1.491.5

11

1.4211.419

12

1.2461.265

13

1.0451.068

14

1.4521.461

15

1.1471.17

16

1.4871.465

17

1.481.472

18

1.3321.378

19

0.5090.479

20

1.2471.267

21

1.461.462

22

1.0751.098

23

1.1191.128

24

1.31.295

25

1.4571.439

26

1.4611.427

27

0.6920.662

28

1.0451.063

29

1.0751.071

31

1.2991.28

32

1.4161.391

34

0.8380.817

35

1.4521.462

36

1.1181.152

37

1.2971.275

38

1.1441.155

39

1.491.483

40

1.1881.079

41

0.4830.488

42

1.1451.17

43

1.2981.291

44

1.4121.39

45

1.4861.474

46

1.0961.054

47

0.5530.572

48

1.4821.446

49

1.4531.434

51

1.1811.075

52

0.5560.56

53

1.4771.457

54

1.4551.476

55

0.7960.757

56

0.4790.485

57

1.331.332

58

0.6930.648

59

0.5080.478

1

1.0190.97

4

1.0921.055

7

1.2091.123

10

0.8250.755

30

1.4191.367

33

1.3671.281

50

1.3611.275


number of group

kr,SCORPIO

kr,BIPR7

11

0.0000.000

24


27.8.2006 Tef = 40,4 eff.days NR = 1373 MW h6 = 225 cm

2

-1.8

3

1

5

2.6

6

-0.9

8

0.3

9

0.6

11

-0.2

12

1.5

13

2.2

14

0.6

15

2

16

-1.5

17

-0.6

18

3.4

19

-5.9

20

1.6

21

0.1

22

2.2

23

0.8

24

-0.4

25

-1.3

26

-2.4

27

-4.3

28

1.7

29

-0.4

31

-1.5

32

-1.8

34

-2.5

35

0.7

36

3

37

-1.7

38

1

39

-0.5

40

-9.2

41

1

42

2.2

43

-0.5

44

-1.6

45

-0.8

46

-3.8

47

3.5

48

-2.4

49

-1.3

51

-9

52

0.7

53

-1.4

54

1.4

55

-4.9

56

1.2

57

0.1

58

-6.4

59

-5.9

1

-4.9

4

-3.4

7

-7.1

10

-8.5

30

-3.7

33

-6.3

50

-6.3


number of group


0.000

25


4.1 Operation with Gd II fuel 23.cycle 3.unit Bohunice NPP

2

20

1 3 4 5 6 7 8 9 10

191817161514131211

21 22 23 24 25 26 27

34333231302928

36 37 38 39 40 41

4746

5251504948

45444342

53 54 55 56

57 58

59

35

Core loading pattern

ENRICHMENT

ENRICHMENT

ENRICHMENT

26


Physical start-up resultsDuration: from 2.9.2006 10.26 to 4.9.2006 5.10

Theoretical Experimental Deviation CriteriaCritical concentration H3BO3 in PC [g/kg] 7.62 7.9 0.28 ±0.4 g/kgAsymetry coeficients min 1 0.981 -0.019 -7%rel

max 1 1.024 0.024 7%relAsyptotic period min - - -10.70% -30%rel

max - - 14.70% 30%rel200 [OC] -0.77 -0.77 0 ±0.4*10-2 %/oC210 -0.88 -0.94 0.06 ±0.4*10-2 %/oC220 -1.01 -1.11 0.1 ±0.4*10-2 %/oC

Temperature reactivity coefficient [10-2%/oC] 230 -1.16 -1.28 0.12 ±0.4*10-2 %/oC240 -1.32 -1.45 0.13 ±0.4*10-2 %/oC250 -1.5 -1.62 0.12 ±0.4*10-2 %/oC260 -1.69 -1.79 0.1 ±0.4*10-2 %/oC

CA system total worth [%] 10.52 11 4.60% ±21%relCA system total worth with CA 03-46 stuck[%] 7.43 7.74 4.20% ±20%relWorth of "ejected" CA 06-49 [%] 0.45 0.42 -6.70% ±20%relCA drop time [s] 8 to 13 10.2 to 11.6 - from 8 to 13 sBoron acid worth [%kg/g] -1.47 -1.35 8.20% ±17%relWorth of working CA [%] 0.83 0.94 -13.30% ±17%relIsothermal state TČ - < 0.5 < 0.5 < 0.5

OT - < 0.2 < 0.2 < 0.2

27


Maximal radial assembly-wise power peaking factors kq

11/5

11/5

11/5

21/621/621/6

44

44

44

44

11

111111

11

21

21

21

21

2121212121

1.3

1.32

1.34

1.36

1.38

1.4

1.42

1.44

0 10 20 30 40 50 60 70 80 90 100Tef [dni]

kq

800

900

1000

1100

1200

1300

1400

1500

kq max. I.generation

kq max. II.generation

kq max. I. generation BIPR

kq max. II.generation BIPR

Power

Comparsion BIPR-SCORPIO

28


Pin-wise power peaking factors kr

8

17

17

17

17

17171717

17/117/617/1

9/59/59/5

9

99999

99

9

1.4

1.45

1.5

1.55

1.6

0 10 20 30 40 50 60 70 80 90 100

Eff.days

kr

kr max. I.generation BIPR

kr max.I.generation

kr max II.generation

kr max. II.generation BIPR

Comparsion BIPR-SCORPIO

29


Maximal linear power qlin

17/117/117/617/6

17/117/117/1

17/1

9/49/49/5

9/59/5

9/5

9/59/5

150

170

190

210

230

250

270

290

0 2 4 6 8 10 12 14 16 18 20

Eff.days

qlin

[W/c

m]

I.generation

II.generation

Limit for I.generation

Limit for II.generation

30




2

1.2271.216

3

1.1871.213

5

0.8870.92

6

1.0641.052

8

1.3331.324

9

1.2691.266

11

1.3741.388

12

1.1431.157

13

0.9771.014

14

1.3091.322

15

0.9981.028

16

1.1991.196

17

1.3261.34

18

0.9971.022

19

0.3060.304

20

1.1431.156

21

1.3431.364

22

0.9751.02

23

1.0161.047

24

1.1971.218

25

1.3291.319

26

1.1611.131

27

0.4290.425

28

0.9771.005

29

0.9751.012

31

1.1711.185

32

1.3451.351

34

0.540.531

35

1.3091.321

36

1.0161.04

37

1.1711.182

38

1.0581.112

39

1.2881.282

40

0.8470.804

41

0.2790.275

42

0.9961.019

43

1.1961.221

44

1.3461.332

45

1.2871.276

46

0.7630.741

47

0.3270.329

48

1.1981.187

49

1.3261.344

51

0.8440.791

52

0.3270.322

53

1.3221.327

54

1.1551.143

55

0.5250.504

56

0.2770.274

57

0.9940.986

58

0.4260.416

59

0.3040.292

1

0.9850.896

4

1.0871.056

7

0.9920.869

10

0.5680.545

30

1.2971.275

33

1.1421.101

50

1.1391.095


number of group

kq,SCORPIO

kq,BIPR7

11

0.0000.000

31



2

-0.9

3

2.2

5

3.7

6

-1.1

8

-0.7

9

-0.2

11

1

12

1.2

13

3.7

14

1

15

3

16

-0.2

17

1.1

18

2.5

19

-0.6

20

1.1

21

1.6

22

4.6

23

3.1

24

1.8

25

-0.8

26

-2.6

27

-0.8

28

2.9

29

3.8

31

1.2

32

0.4

34

-1.6

35

0.9

36

2.3

37

1

38

5.1

39

-0.5

40

-5

41

-1.4

42

2.3

43

2.1

44

-1.1

45

-0.9

46

-2.9

47

0.8

48

-0.9

49

1.3

51

-6.3

52

-1.5

53

0.4

54

-1

55

-3.9

56

-0.8

57

-0.8

58

-2.4

59

-3.9

1

-9.1

4

-2.9

7

-12.4

10

-4

30

-1.7

33

-3.6

50

-3.9


number of group


0.000

32




2

1.361.323

3

1.3131.312

5

0.9670.995

6

1.1581.122

8

1.4431.416

9

1.541.522

11

1.4691.461

12

1.2951.281

13

1.0861.081

14

1.4051.439

15

1.1091.134

16

1.3571.334

17

1.4911.47

18

1.3441.372

19

0.5080.488

20

1.2951.279

21

1.4781.476

22

1.061.078

23

1.1341.148

24

1.3671.358

25

1.471.428

26

1.4661.422

27

0.6830.656

28

1.0851.071

29

1.0591.064

31

1.2941.295

32

1.4651.455

34

0.7990.764

35

1.4041.42

36

1.1331.144

37

1.2931.291

38

1.1491.188

39

1.5071.476

40

1.1881.068

41

0.4780.474

42

1.1071.123

43

1.3651.363

44

1.4651.431

45

1.5071.493

46

1.0720.992

47

0.5370.542

48

1.3551.323

49

1.4681.456

51

1.1851.052

52

0.5360.53

53

1.4861.456

54

1.4611.438

55

0.7850.725

56

0.4740.473

57

1.3411.325

58

0.6820.639

59

0.5120.475

1

1.060.948

4

1.2251.153

7

1.1230.969

10

0.8450.775

30

1.4091.387

33

1.4081.305

50

1.4061.3


number of group

kr,SCORPIO

kr,BIPR7

11

0.0000.000

33



2

-2.8

3

-0.1

5

2.9

6

-3.1

8

-1.9

9

-1.2

11

-0.6

12

-1.1

13

-0.5

14

2.4

15

2.3

16

-1.7

17

-1.4

18

2.1

19

-3.9

20

-1.2

21

-0.1

22

1.7

23

1.2

24

-0.7

25

-2.9

26

-3

27

-4

28

-1.3

29

0.5

31

0.1

32

-0.7

34

-4.4

35

1.1

36

1

37

-0.2

38

3.3

39

-2.1

40

-10.1

41

-0.8

42

1.5

43

-0.1

44

-2.4

45

-0.9

46

-7.5

47

1

48

-2.4

49

-0.8

51

-11.2

52

-1.2

53

-2

54

-1.6

55

-7.7

56

-0.1

57

-1.2

58

-6.3

59

-7.2

1

-10.6

4

-5.9

7

-13.7

10

-8.3

30

-1.6

33

-7.3

50

-7.5


number of group


0.000

34


5.Conclusion

-The close changes of fuel cycle in Bohunice V-2 NPP is expected in connection with increase of the reactor power to 107% in 2010

- Choice of supplier and fuel licensing took aproximately four years. - Diferencies between theoretical(BIPR7) and experimental values measured during

physical start-up are not significant.- Diferencies between theoretical(BIPR7) and „experimental“(SCORPIO-MOBYDICK)

values are not significant up to the moment.

35


THANK YOU FOR YOU ATTENTION!

Presentation prepare:O.Grežďo

References:M.Antal,M.Kačmar – fuel cycles,licensing

V.Mráz – 4.unit,SCORPIOO.Grežďo – 3.unit

36


Fig. 1 Summary of Bohunice V-2 NPP fuel cycle.Weight of fresh fuel for FPD and burn up of discharged fuel.

37


Fig.2 Number of leakage FA – 3. and 4.UNIT

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

блок № 3

блок № 4

0

1

2

3

4

5

год

блок № 3

блок № 4числ

о не

плот

ных ка

ссет

year

Num

bero

flea

kage

FA

unit 3.

unit 4.

unit 3.unit 4.

38


Fig 3. Screen - Power distribution (system tests)

39


Fig.4 Screen – Strategy generator

40


Fig.5 Screen – Limit checking(system test)

Utilisation of Gd II Fuel Assemblies at Bohunice NPP Unit … · Utilisation of Gd II Fuel...

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