abstracts of the cross check analysison the evaluation of the cores of unit 1, 2 and 3 of fukkushima...

7/31/2019 Abstracts of the Cross Check Analysison the Evaluation of the Cores of Unit 1, 2 and 3 of Fukkushima Dai-IchiNPP

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Abstracts of the cross check analysis

on the evaluation of the cores of Unit 1, 2 and 3 of Fukkushima Dai-ichi

NPP reported by TEPCO

Abstracts

On the accident of Fukushima Dai-ichi NPP, a lot of works to converge it and

collecting essential information to determine the cause are in progress. Nuclear and

Industry Safety Agency (NISA) issued to TEPCO to submit reports of accident records

and others related to the Fukushima Dai-ichi NPP on April 25 pursuant to the Provisions

of Article 67, Paragraph 1 of the Act on Regulation of Nuclear Source Materials,

Nuclear Fuel Materials and Reactors and Article 106, Paragraph 3 of the Electricity

Business Act, with the purpose of implementing adequate measures going forward.According to the report, NISA directed TEPCO on May 16 to submit reports of

evaluation of safety on nuclear reactor facilities regarding to the analysis of records

before and after the earthquake.

On the core damage unit 1 through 3 of Fukushima Dai-ichi NPP, TEPCO submitted

evaluation reports, which were calculated by severe accident analysis code MAAP

based on the operation records and observed parameters, to NISA on May 23

NISA examined the reports to confirm the validity of analysis and evaluation. The

examination was carried out by using other severe accident analysis code, Methods for

Estimation of Leakages and Consequences of Releases (MELCOR), supported by Japan

Nuclear Energy Safety Organization (JNES). Abstract of analysis results by MELCOR

is described below.

Analysis methods and conditions

Based on the observed data, chronology, etc. of Unit 1 through 3 of Fukushima

Dai-ichi NPP which were reported by utility, computational analysis was calculated. A

severe accident analysis code MELCOR, which is developed by US NRC in charge and

is used widely by regulators and TSOs as JNES, was used in this work.

On the MELCOR analysis, transient of plant during 4 days from the accident, major

events occurred, was calculated. We cared a lot about parameters which have great

effect on the consequences or whose chronology is uncertain. According to the

sensitivity analysis on them, uncertain chronology was confirmed and accident scenario

was studied.

For example, analysis conditions conducted by TEPCO were confirmed and

sensitivity analyses, shown in Tables 1-a, 2-a, and 3-a, were carried out.


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Results and conclusions

Abstracts of MELCOR analysis are described below. Comparisons to the results of

utility are shown in Table 1-1 3, Table 2-1 2, and Table 3-1 2.

Release ratio of fission products to the environment in each analysis is shown inTable 4. Preliminary calculation of fission products, regarding inventory of each unit,

released to the environment during the term of the analysis is shown in Table 5. This

work was calculated by using conditions (IC operation, PCV ventilation, alternative

water injection, etc.) based on the operation record, alarms, and plant behavior at the

transition which were reported by TEPCO on May 16. Total amount of fission products

released to the environment was scrutinized and total amount of I 131 and Cs-137

(conversion to I 131) from unit 1, 2, and 3 is 840000 TBq. Compared to the reported

value 370000 TBq (630000 TBq by NSC) for INES on April 12, it is in the same range.Information about operation and behavior of equipment is still insufficient, however,

further investigation is conducted to reveal the cause of accident.


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Table 1-a Analysis conditions on Unit 1

Identifier Analysis conditions Remarks results

TEPCO Correspond to utility

s analysis Table 1-1, Fig. 1-1-111

Case 1 Increasing of heat removal (restart IC-B with IC-A) Table 1-2, Fig. 1-2-1

2

Case 2 Amount of water injected through the fire protection line

varies with RPV pressure.

PCV leakage area at 50 hours is ca. 35 cm 2.

Table 1-3, Fig. 1-3-1

12

Table 2-a Analysis conditions on Unit 2Identifier Analysis conditions Remarks results

TEPCO-1 Correspond to utility s analysis No.1 Table 2-1 Fig.2-1-1

13

TEPCO-2 Correspond to utility s analysis No.2

Amount of water injected through the fire protection line

varies with RPV pressure.

PCV leakage area is ca. 50 cm 2.

S/C leakage area is ca. 300 cm2

Table 2-2, Fig.2-2-1

12

Case-1 Based on the utility s analysis No.1, but

PCV is intact

Fig.2-3-1 2


PCV leakage area is ca. 50 cm 2.

Fig.2-4-1


S/C leakage area is ca. 300 cm 2

Fig.2-5-1

Table 3-a Analysis conditions on Unit 3

Identifier Analysis conditions Remarks results

TEPCO-1 Correspond to utility s analysis No.1 Table 3-1, Fig.3-1-1

11

TEPCO-2 Correspond to utility s analysis No.2 Table 3-2, Fig.3-2-1

14


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Table 1-1 Result of analysis on Unit 1 [TEPCO] and comparison to the utility s result

Event Results (this work) Utility s result

Core exposure 16 40, Mar. 11 2 hours (relative time) 3 hours (relative time)Core damage 18 00, Mar. 11 3 hours (relative time) 4 hours (relative time)

RPV failure 20 00, Mar. 11 5 hours (relative time) 15 hours (relative time)

Table 1-2 Result of analysis on Unit 1 [case 1] and comparison to the utility s result


Core exposure 16 50, Mar. 11 2 hours (relative time) 3 hours (relative time)

Core damage 18 20, Mar. 11 4 hours (relative time) 4 hours (relative time)


Table 1-3 Result of analysis on Unit 1 [case 2] and comparison to the utility s result


Core exposure 16 40, Mar. 11 2 hours (relative time) 3 hours (relative time)

Core damage 18 00, Mar. 11 3 hours (relative time) 4 hours (relative time)



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Table 2-1 Result of analysis on Unit 2 [TEPCO-1] and comparison to the utility s result

Event Results (this work) Utility s result (No.1)

Core exposure 18 00, Mar 14 75 hours (relative time) 75 hours (relative time)Core damage 22 30, Mar 14 80 hours (relative time) 77 hours (relative time)

RPV failure

(RPV doesn t fail)

(RPV doesn t fail)


Event Results (this work) Utility s result (No.2)

Core exposure 18 00, Mar 14 75 hours (relative time) 75 hours (relative time)

Core damage 19 50, Mar 14 77 hours (relative time) 77 hours (relative time)RPV failure 22 50, Mar 14 80 hours (relative time) 109 hours (relative time)


Event Results (this work) Utility s result (No. 1)


Core damage 10 20, Mar 13 44 hours (relative time) 42 hours (relative time)RPV failure

(RPV doesn t fail)

(RPV doesn t fail)


Event Results (this work) Utility s result (No. 2)


Core damage 10 20, Mar 13 44 hours (relative time) 42 hours (relative time)

RPV failure 22 10, Mar 14 79 hours (relative time) 66 hours (relative time)


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Table 4 FP release ratio

UnitIdentifier

of analysisNoble

gas CsI Cs Te Ba Ru Ce La

1

TEPCO 9.9E-01 1.9E-03 9.1E-04 2.4E-02 1.2E-04 6.4E-09 1.1E-06 1.1E-06

Case 1 9.5E-01 1.2E-03 8.2E-04 1.1E-02 6.2E-05 2.1E-11 8.9E-07 6.9E-07

Case 2 9.5E-01 6.6E-03 2.9E-03 1.1E-02 4.0E-05 9.0E-10 1.4E-07 1.2E-07

2

TEPCO-1 8.1E-01 3.8E-03 3.4E-03 4.2E-03 4.9E-04 7.6E-10 7.4E-11 6.5E-08

TEPCO-2 9.6E-01 6.7E-02 5.8E-02 3.0E-02 2.6E-04 5.4E-10 4.0E-06 8.4E-07

Case 1 9.7E-01 1.3E-03 4.6E-04 2.5E-04 3.3E-04 2.0E-11 1.5E-12 1.5E-09

Case 2 9.7E-01 3.9E-02 3.8E-02 5.1E-02 2.9E-04 4.1E-11 8.2E-06 1.1E-06

Case 3 9.7E-01 4.1E-02 3.9E-02 3.5E-02 4.0E-04 4.6E-11 1.3E-05 1.2E-06

3TEPCO-1 6.5E-01 8.2E-03 5.9E-03 2.7E-03 6.1E-04 2.9E-10 2.5E-11 2.7E-08

TEPCO-2 9.9E-01 3.0E-03 2.7E-03 2.4E-03 4.3E-04 8.6E-10 5.0E-08 1.3E-07


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Table 5 Preliminary calculation of FP released to the environmentin the early stage of Fukushima Ddai-ichi accident (Bq)

Unit 1 Unit 2 Unit 3 Total

Xe-133 5.2 d 3.410 18 3.510 18 4.410 18 1.110 19

Cs-134 2.1 y 7.110 14 1.610 16 8.210 14 1.810 16

Cs-137 30.0 y 5.910 14 1.410 16 7.110 14 1.510 16

Sr-89 50.5 d 8.210 13 6.810 14 1.210 15 2.010 15

Sr-90 29.1 y 6.110 12 4.810 13 8.510 13 1.410 14

Ba-140 12.7 d 1.310 14 1.110 15 1.910 15 3.210 15

Te-127m 109.0 d 2.510 14 7.710 14 6.910 13 1.110 15

Te-129m 33.6 d 7.210 14 2.410 15 2.110 14 3.310 15

Te-131m 30.0 h 9.510 13 5.410 10 1.810 12 9.710 13

Te-132 78.2 h 7.410 14 4.210 11 1.410 13 7.610 14

Ru-103 39.3 d 2.510 09 1.810 09 3.210 09 7.510 09

Ru-106 368.2 d 7.410 08 5.110 08 8.910 08 2.110 09

Zr-95 64.0 d 4.610 11 1.610 13 2.210 11 1.710 13

Ce-141 32.5 d 4.610 11 1.710 13 2.210 11 1.810 13

Ce-144 284.3 d 3.110 11 1.110 13 1.410 11 1.110 13

Np-239 2.4 d 3.710 12 7.110 13 1.410 12 7.610 13

Pu-238 87.7 y 5.810 08 1.810 10 2.510 08 1.910 10

Pu-239 24065 y 8.610 07 3.110 09 4.010 07 3.210 09

Pu-240 6537 y 8.810 07 3.010 09 4.010 07 3.210 09

Pu-241 14.4 y 3.510 10 1.210 12 1.610 10 1.210 12

Y-91 58.5 d 3.110 11 2.710 12 4.410 11 3.410 12

Pr-143 13.6 d 3.610 11 3.210 12 5.210 11 4.110 12

Nd-147 11.0 d 1.510 11 1.310 12 2.210 11 1.610 12

Cm-242 162.8 d 1.110 10 7.710 10 1.410 10 1.010 11

I-131 8.0 d 1.210 16 1.410 17 7.010 15 1.610 17

I-132 2.3 h 4.510 14 9.610 11 1.810 13 4.710 14

I-133 20.8 h 6.510 14 1.410 12 2.610 13 6.810 14

I-135 6.6 h 6.110 14 1.310 12 2.410 13 6.310 14

Sb-127 3.9 d 1.710 15 4.210 15 4.510 14 6.410 15

Sb-129 4.3 h 1.610 14 8.910 10 3.010 12 1.610 14

Mo-99 66.0 h 8.110 07 1.010 04 6.710 06 8.810 07

Evaluated by using the results of case2(unit 1), TEPCO-2(unit 2), TEPCO-2(unit3) in table 4


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0.0

0.2

0.4

0.6

0.8

1.06.0

7.0

-4000

-2000

0

2000

4000

6000

0 12 24 36 48 60 72 84 96

P r e s s .

( M P a

)

a t e r

l e v e

l ( m m

)

Relative time (h)

(,)Observed data1F1

RPV press. TAF

RPVwater level

3/12 3/13 3/14 3/15 3/16

Date

Fig. 1-1-1 RPV pressure and water level (unit 1) [TEPCO]

IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)

0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

D/W press.

2Pd

1Pd

3/12 3/13 3/14 3/15 3/16

P r e s s .

( M P a

)

Relative time (h)

()Observed data

Date

Fig. 1-1-2 D/W pressure (unit 1) [TEPCO] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)


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0.0

0.2

0.4

0.6

0.8

1.0

0

100

200

300

400

500

600

700

0 12 24 36 48 60 72 84 96

T e m p .

( K )

1F1

D/W press.

S/C press.

3/12 3/13 3/14 3/15 3/16

D/W temp.

S/C temp.

Saturation temp.

P r e s s .

( M P a

)

Relative time (h)

(,)Observed data

Date

Fig. 1-1-3 PCV pressure and temperature (unit 1) [TEPCO]


0

500

1000

1500

2000

2500

3000

0 12 24 36 48 60 72 84 96

M a x

i m u m

t e m p .

o f c o r e

K

3/12 3/13 3/14 3/15 3/16

Relative time (h)

Date

Fig. 1-1-4 Maximum temperature of the core (unit 1) [TEPCO] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)


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0

10

20

30

40

50

60

70

80

0 12 24 36 48 60 72 84 960.0

0.2

0.4

0.6

0.8

1.0

M a s s

( t o n

)

R a t

i o ( - )

1F1

3/12 3/13 3/14 3/15 3/16

Intact fuel

Debris

Relative time (h)

Date

Fig. 1-1-5 Mass of the core (unit 1) [TEPCO] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)


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Top

Bottomperiphery periphery

Top


Top

Bottom

periphery peripherycentert = 40 h

centert = 5 h

centert = 6 h

ratio1.0

0.8

0.6

0.4

0.2

0.0

ratio1.0

0.8

0.6

0.4

0.2

0.0

ratio1.0

0.8

0.6

0.4

0.2

0.0 Fig. 1-1-6 Distribution of intact fuel (unit 1) [TEPCO]


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0

200

400

600

800

1000

1200

0 12 24 36 48 60 72 84 96

H y

d r o g e n

k g

Relative time (h)

Date

3/12 3/13 3/14 3/15 3/16

Generated hydrogen

Leakage from PCV

Fig. 1-1-7 Hydrogen generation (unit 1) [TEPCO]



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0.0

0.2

0.4

0.6

0.8

1.0

0

0.2

0.4

0.6

0.8

1

0 12 24 36 48 60 72 84 96

F P r e

l e a s e r a t i o

( - )

A c c u m u

l a t e

d F P r e

l e a s e r a t i o ( -

)1F1 Noble gas(accumulated)

Noble gas

3/12 3/13 3/14 3/15 3/16

Relative time (h)

Date

0

1 10 -4

2 10 -4

3 10 -4

4 10 -4

5 10 -4

0

1 10 -2

2 10 -2

3 10 -2

4 10 -2

5 10 -2

0 12 24 36 48 60 72 84 96

CsICsTeBa

1F1

3/12 3/13 3/14 3/15 3/16

F P r e

l e a s e r a t i o

( - )

A c c u m u

l a t e

d F P r e

l e a s e r a t

i o ( - )

Relative time (h)

Date

Fig. 1-1-8 FP release ratio to the environment (1/2) (unit 1) [TEPCO] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)


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10 -4

10 -3

10 -2

10 -1

100

10 -9

10 -7

10 -5

10 -3

10 -1

0 12 24 36 48 60 72 84 96

Noble gasCsI

Cs

Te

Ba

Ru

Ce

La

1F1

3/12 3/13 3/14 3/15 3/16

Solid line(left axis)Dashed line(right axis)

F P r e

l e a s e r a t i o

( - )

A c c u m u

l a t e

d F P r e


)

Relative time (h)

Date

Fig. 1-1-9 FP release ratio to the environment (2/2) (unit 1) [TEPCO]


0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

C

s I d

i s t r

i b u t i o n

( - )

1F1

3/12 3/13 3/14 3/15 3/16

W/W

D/W

RPV

Relative time (h)

Date

Fig. 1-1-10 Distribution of CsI (unit 1) [TEPCO] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close),

sea water inject., expansion of PCV failure (assumption)


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0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

C s

d i s t r

i b u t i o n

( - )

1F1

3/12 3/13 3/14 3/15 3/16

W/W

D/W

RPV

Relative time (h)

Date

Fig. 1-1-11 Distribution of Cs (unit 1) [TEPCO] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)


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0.0

0.2

0.4

0.6

0.8

1.0

6.0

7.0

-4000

-2000

0

2000

4000

6000

0 12 24 36 48 60 72 84 96

P r e s s .

( M P a

)

a t e r

l e v e

l ( m m

)

(,)Observed data1F1

RPV press. TAF

RPVwater level

3/12 3/13 3/14 3/15 3/16

Relative time (h)

Date

Fig. 1-2-1 RPV pressure and water level (unit 1) [case 1]


0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

P

r e s s .

M P a

() Observed data

D/W press.

2Pd

1Pd

3/12 3/13 3/14 3/15 3/16

Relative time (h)

Date

Fig. 1-2-2 D/W pressure (unit 1) [case 1] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close),



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0.0

0.2

0.4

0.6

0.8

1.0

-4000

-2000

0

2000

4000

6000

0 12 24 36 48 60 72 84 96

P r e s s .

( M P a

)

a t e r

l e v e

l ( m m

)

(,)Observed data1F1

RPV press.

TAF

RPVwater level

3/12 3/13 3/14 3/15

Relative time (h)

Date

Fig. 1-3-1 RPV pressure and water level (unit 1) [case 2]


0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

P r e s s .

M P a

()Observed data

D/W press.

2Pd

1Pd

3/12 3/13 3/14 3/15

Relative time (h)

Date

Fig. 1-3-2 D/W pressure (unit 1) [case 2] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)


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0.0

0.2

0.4

0.6

0.8

1.0

0

100

200

300

400

500

600

700

0 12 24 36 48 60 72 84 96

P r e s s .

( M P a

)

T e m p .

( K )

(,)Observed data

1F1

D/W press.

S/C press.

3/12 3/13 3/14 3/15 3/16

D/W temp.

S/C temp.

Saturation temp.

Relative time (h)

Date

Fig. 1-3-3 PCV pressure and temperature (unit 1) [case 2]


0

500

1000

1500

2000

2500

3000

0 12 24 36 48 60 72 84 96

M a x

i m u m

t e m p .

o f c o r e

K

3/12 3/13 3/14 3/15 3/16

Relative time (h)

Date

Fig. 1-3-4 Maximum temperature of the core (unit 1) [case 2]



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0

10

20

30

40

50

60

70

80

0 12 24 36 48 60 72 84 960.0

0.2

0.4

0.6

0.8

1.0

M a s s

( t o n

)

R a t i o

( - )

1F1

3/12 3/13 3/14 3/15 3/16

Intact fuel

Debris

Relative time (h)

Date

Fig. 1-3-5 Mass of the core (unit 1) [case 2] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)


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Top


Top


Top

Bottomperiphery peripherycenter

t = 18 h

centert = 6 h

centert = 12 h

ratio1.0

0.8

0.6

0.4

0.2

0.0

ratio1.0

0.8

0.6

0.4

0.2

0.0

ratio1.0

0.8

0.6

0.4

0.2

0.0 Fig. 1-3-6 Distribution of intact fuel (unit 1) [case 2]


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0

200

400

600

800

1000

1200

0 12 24 36 48 60 72 84 96

H y

d r o g e n

k g

3/12 3/13 3/14 3/15 3/16

Generated hydrogen

Leakage from PCV

Relative time (h)

Date

Fig. 1-3-7 Hydrogen generation (unit 1) [case 2]


0.0

0.2

0.4

0.6

0.8

1.0

0

0.2

0.4

0.6

0.8

1

0 12 24 36 48 60 72 84 96

F P r e

l e a s e r a t i o

( - )

A c c u m u

l a t e

d F P r e

l e a s e r a t i o

( - )1F1 Noble gas (accumulated)

Noble gas

3/12 3/13 3/14 3/15 3/16

Relative time (h)

Date

Fig. 1-3-8 FP release ratio to the environment (1/3) (unit 1) [case 2]



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0

1 10 -4

2 10 -4

3 10 -4

4 10 -4

5 10 -4

0

5 10 -3

1 10 -2

1.5 10 -2

2 10 -2

0 12 24 36 48 60 72 84 96

CsICs

TeBa

1F1

3/12 3/13 3/14 3/15 3/16

F P r e

l e a s e r a t i o

( - )

A c c u m u

l a t e

d F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date

Fig. 1-3-9 FP release ratio to the environment (2/3) (unit 1) [case 2] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)

10 -6

10 -5

10 -4

10 -3

10 -10

10-8

10 -6

10 -4

10 -2

100

0 12 24 36 48 60 72 84 96

Noble gas

CsI

Cs

Te

Ba

Ru

Ce

La

1F1

3/12 3/13 3/14 3/15 3/16

Solid line (left axis)Dashed line (right axis)

F P r e

l e a s e r a t i o

( - )

A c c u m u

l a t e

d F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date

Fig. 1-3-10 FP release ratio to the environment (3/3) (unit 1) [case 2]



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0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

C s I

d i s t r

i b u t i o n

( - )

1F1

3/12 3/13 3/14 3/15 3/16

W/W

D/W

RPV

Relative time (h)

Date

Fig. 1-3-11 Distribution of CsI (unit 1) [case 2] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)

0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

C

s d i s t r

i b u t i o n

( - )

1F1

3/12 3/13 3/14 3/15 3/16

W/W

D/W

RPV

Relative time (h)

Date

Fig. 1-3-12 Distribution of Cs (unit 1) [case 2] IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close),



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0

20

40

60

80

100

0

500

1000

1500

2000

0 24 48 72 96 120 144

I n j e c t e d w a t e r

( m 3 / h )

T o t a l

a m o u n t

( m 3 )

1F2

Total

RCIC

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Fire protection

Injected from the outside

Relative time (h)

Date

Fig. 2-1-1 Amount of water injection (unit 2) [TEPCO-1]

RCIC start manually, SBO, Water source change from CST to S/P, RCIC stop, Seawater inject., RPV depressurized, S/R valve-2 open, Impact sound

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

-4000

-2000

0

2000

4000

6000

0 24 48 72 96 120 144

P r e s s . (

M P a )

a t e r

l e v e

l ( m m

)

()Observed data1F2

RPV press.

TAF

Downcomer

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Core

Relative time (h)

Date

Fig. 2-1-2 RPV pressure and water level (unit 2) [TEPCO-1]



25/53

Attachment IV-2

25

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

P r e s s .

M P a

() Observed data

D/W press.

2Pd

1Pd

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-1-3 D/W pressure (unit 2) [TEPCO-1]RCIC start manually, SBO, Water source change from CST to S/P, RCIC stop, Seawater inject., RPV depressurized, S/R valve-2 open, Impact sound

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 1440

100

200

300

400

500

P r e s s .

M P a

()Observed data

D/W press.

2Pd

1Pd T e m p .

K

S/C press.

Saturation temp.

D/W temp.

S/P temp.

3/12 3/133/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-1-4 PCV pressure and temperature (unit 2) [TEPCO-1]



26/53

Attachment IV-2

26

0

500

1000

1500

2000

2500

3000

0 24 48 72 96 120 144

M a x

i m u m t e m p .

o f c o r e

( K )

1F2

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-1-5 Maximum temperature of the core (unit 2) [TEPCO-1]


0

20

40

60

80

100

0 24 48 72 96 120 1440.0

0.2

0.4

0.6

0.8

1.0

M a s s

( t o n

)

1F2

Intact fuel

Debris

R a t

i o ( - )

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-1-6 Mass of the core (unit 2) [TEPCO-1]RCIC start manually, SBO, Water source change from CST to S/P, RCIC stop, Seawater inject., RPV depressurized, S/R valve-2 open, Impact sound


27/53

Attachment IV-2

27

Top


Top


centert = 70 h

centert = 90 h

ratio1.0

0.8

0.6

0.4

0.2

0.0

ratio1.0

0.8

0.6

0.4

0.2

0.0

Fig. 2-1-7 Distribution of intact fuel (unit 2) [TEPCO-1]

0

200

400

600

800

1000

0 24 48 72 96 120 144

H y d r o g e n

( k g )

1F2

Generated hydrogen

Leakage from PCV

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-1-8 Hydrogen generation (unit 2) [TEPCO-1]



28/53

Attachment IV-2

28

0.000

0.010

0.020

0.030

0.040

0.050

0.060

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

1F2

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )

A c c u m u l a t e d

F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date

Noble gas(accumulated)

Noble gas

Fig. 2-1-9 FP release ratio to the environment (1/3) (unit 2) [TEPCO-1]RCIC start manually, SBO, Water source change from CST to S/P, RCIC stop, Seawater inject., RPV depressurized, S/R valve-2 open, Impact sound

0

1 10 -4

2 10 -4

3 10 -4

4 10 -4

5 10 -4

6 10 -4

0.0

2.0 10-3

4.0 10 -3

6.0 10 -3

8.0 10 -3

1.0 10 -2

0 24 48 72 96 120 144

CsICsTeBa

1F2

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )


F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date



29/53

Attachment IV-2

29

10 -5

10 -4

10 -3

10 -2

10 -1

10 -11

10 -9

10 -7

10 -5

10 -3

10 -1

0 24 48 72 96 120 144

Noble gasCsICsTeBaRuCeLa

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )


F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date



0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

C s I d i s t r

i b u t

i o n

( - )

1F2

W/W

RPV

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-1-12 Distribution of CsI (unit 2) [TEPCO-1]



30/53

Attachment IV-2

30

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

C s

d i s t r i

b u t i o n

( - )

1F2

W/W

RPV

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-1-13 Distribution of Cs (unit 2) [TEPCO-1]



31/53

Attachment IV-2

31

0

20

40

60

80

100

0

500

1000

1500

2000

2500

3000

0 24 48 72 96 120 144

1F2RCIC

3/12 3/13 3/14 3/15 3/16 3/17 3/18


( m 3 / h )

T o t a l

a m o u n t

( m 3 )

Total

Fire protection

Relative time (h)

Date

Fig. 2-2-1 Amount of water injection (unit 2) [TEPCO-2]


0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

-4000

-2000

0

2000

4000

6000

0 24 48 72 96 120 144

1F2

TAF

3/12 3/13 3/14 3/15 3/16 3/17 3/18

P r e s s . (

M P a )

a t e r

l e v e

l ( m m

)

()Observed data

RPV press.

Relative time (h)

Date

Water level

Fig. 2-2-2 RPV pressure and water level (unit 2) [TEPCO-2]



32/53

Attachment IV-2

32

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

P r e s s .

M P a

()Observed data

2Pd

1Pd

D/W press.

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-2-3 D/W pressure (unit 2) [TEPCO-2]RCIC start manually, SBO, Water source change from CST to S/P, RCIC stop, Seawater inject., RPV depressurized, S/R valve-2 open, Impact sound

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 1440

100

200

300

400

500

P r e s s .

M P a

Relative time (h)

()Observed data

D/W press.

2Pd

1Pd

Date

T e m p .

K

S/C press.

Saturation temp.D/W temp.

S/P temp.

3/12 3/133/14 3/15 3/16 3/17 3/18

Fig. 2-2-4 PCV pressure and temperature (unit 2) [TEPCO-2]



33/53

Attachment IV-2

33

0

500

1000

1500

2000

2500

3000

0 24 48 72 96 120 144

M a x

i m u m t e m p .

o f c o r e

( K )

1F2

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-2-5 Maximum temperature of the core (unit 2) [TEPCO-2]


0

20

40

60

80

100

0 24 48 72 96 120 1440.0

0.2

0.4

0.6

0.8

1.0

M a s s

( t o n

)

1F2

Relative time (h)

Date

Intact fuel

Debris

R a t

i o ( - )

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Fig. 2-2-6 Mass of the core (unit 2) [TEPCO-2]RCIC start manually, SBO, Water source change from CST to S/P, RCIC stop, Seawater inject., RPV depressurized, S/R valve-2 open, Impact sound


34/53

Attachment IV-2

34

Top


Top


centert = 80 h

centert = 90 h

ratio1.0

0.8

0.6

0.4

0.2

0.0

raio1.0

0.8

0.6

0.4

0.2

0.0

Fig. 2-2-7 Distribution of intact fuel (unit 2) [TEPCO-2]


35/53

Attachment IV-2

35

0

200

400

600

800

1000

0 24 48 72 96 120 144

H y d r o g e n

( k g )

1F2

Generated hydrogen

Leakage from PCV

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-2-8 Hydrogen generation (unit 2) [TEPCO-2]


0.000

0.005

0.010

0.015

0.020

0.025

0.030

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

1F2

Noble gas


3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )

A c c u m u

l a t e

d F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date



36/53

Attachment IV-2

36

10 -5

10 -4

10 -3

10-2

10 -10

10 -8

10 -6

10 -4

10 -2

10 0

0 24 48 72 96 120 144


1F2

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )


F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date



0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

RPV

W/W

D/W

R/B

FHB

Environment C s I

d i s t r

i b u t

i o n

( - )

1F2

W/W

RPV

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-2-11 Distribution of CsI (unit 2) [TEPCO-2]



37/53

Attachment IV-2

37

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

RPV

W/W

D/W

R/B

FHB

Environment

C s

d i s t r i

b u t i o n

( - )

1F2

W/W

RPV

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Relative time (h)

Date

Fig. 2-2-12 Distribution of Cs (unit 2) [TEPCO-2]



38/53

Attachment IV-2

38

0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

P r e s s .

M P a

()Observed data

D/W press.(no leakage)

2Pd

1Pd

3/12 3/13 3/14 3/15

Relative time (h)

Date

Fig. 2-3-1 D/W pressure (unit 2) [case-1]RCIC start manually, SBO, Water source change from CST to S/P, RCIC stop, Seawater inject., RPV depressurized, S/R valve-2 open, Impact sound

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

-4000

-2000

0

2000

4000

6000

0 12 24 36 48 60 72 84 96

1F2

RPV press.

TAF

Water level

3/12 3/13 3/14 3/15

P r e s s . (

M P a )

a t e r

l e v e

l ( m m

)

Relative time (h)

Date

()Observed data

Fig. 2-3-2 RPV pressure and water level (unit 2) [case-1]

RCIC start manually, SBO, Water source change from CST to S/P, RCIC stop, Sea

water inject., RPV depressurized, S/R valve-2 open, Impact sound


39/53

Attachment IV-2

39

0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

2Pd

1Pd

3/12 3/13 3/14 3/15

P r e s s .

M P a

() Observed data

D/W press.

Relative time (h)


0.0

0.2

0.4

0.6

0.8

1.0

0 12 24 36 48 60 72 84 96

P r e s s .

M P a

()Observed data

D/W press.

2Pd

1Pd

3/12 3/13 3/14 3/15

Relative time (h)

Date



40/53

Attachment IV-2

40

0

50

100

150

200

0

500

1000

1500

2000

2500

0 24 48 72 96 120 144

1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

RCIC

HPCI


( m 3 / h )

T o t a l

a m o u n t

( m 3 )

Total

Fire protection

Relative time (h)

Date

Fig.3-1-1 Amount of water injection (unit 3) [TEPCO-1]

RCIC start manually, RCIC stop, HPCI start, HPCI stop, S/RV(open), PCV vent (open),Water inject., PCV vent (close), Sea water inject., PCV vent (open close)

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

-4000

-2000

0

2000

4000

6000

0 24 48 72 96 120 144

1F3

TAF

3/12 3/13 3/14 3/15 3/16 3/17 3/18

P r e s s .

( M P a

)

a t e r

l e v e

l ( m m

)

()Observed data

RPV press.

Downcomer

Core

Relative time (h)

Date

Fig.3-1-2 RPV pressure and water level (unit 3) [TEPCO-1]

RCIC start manually, RCIC stop, HPCI start, HPCI stop, S/RV(open), PCV vent (open),

Water inject., PCV vent (close), Sea water inject., PCV vent (open close)


41/53

Attachment IV-2

41

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

2Pd

1Pd

3/12 3/13 3/14 3/15 3/16 3/17 3/18

P r e s s .

M P a

() Observed data

D/W press.

Relative time (h)

Date

Fig.3-1-3 D/W pressure (unit 3) [TEPCO-1]


0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 1440

100

200

300

400

500

2Pd

1Pd

3/12 3/13 3/14 3/15 3/16 3/17 3/18

P r e s s .

M P a

()Observed data

D/W press.

T e m p .

K

S/C press.

Saturation temp.D/W temp.

S/P temp.

Relative time (h)

Date

Fig.3-1-4 PCV pressure and temperature (unit 3) [TEPCO-1]



42/53


43/53

Attachment IV-2

43

Top


t = 50 h

Top


t = 90 h

center

center

ratio1.0

0.8

0.6

0.4

0.2

0.0

ratio1.0

0.8

0.6

0.4

0.2

0.0

Fig.3-1-7 Distribution of intact fuel (unit 3) [TEPCO-1]

0

200

400

600

800

1000

0 24 48 72 96 120 144

1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

H y d r o g e n

( k g ) Generated hydrogen

Leakage from PCV

Relative time (h)

Date

Fig.3-1-8 Hydrogen generation (unit 3) [TEPCO-1]




44/53

Attachment IV-2

44

0.0

0.1

0.2

0.3

0.4

0.5

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )


F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date


Noble gas

10 -5

10 -4

10 -3

10 -2

10 -1

100

10 -11

10 -9

10 -7

10 -5

10 -3

10 -1

0 24 48 72 96 120 144


1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )


F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date


Fig.3-1-9 FP release ratio to the environment (unit 3) [TEPCO-1]



45/53

Attachment IV-2

45

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

1F3

W/W

RPV

3/12 3/13 3/14 3/15 3/16 3/17 3/18

C s I

d i s t r

i b u t

i o n

( - )

Relative time (h)

Date

Fig.3-1-10 Distribution of CsI (unit 3) [TEPCO-1]


0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

1F3

W/W

RPV

3/12 3/13 3/14 3/15 3/16 3/17 3/18

C s

d i s t r i

b u t i o n

( - )

Relative time (h)

Date

Fig.3-1-11 Distribution of Cs (unit 3) [TEPCO-1]



46/53

Attachment IV-2

46

0

50

100

150

200

0

500

1000

1500

2000

0 24 48 72 96 120 144

1F3

HPCI

RCIC


( m 3 / h )

T o t a l

a m o u n t

( m 3 )Total

Fire protection

Relative time (h)

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Fig.3-2-1 Amount of water injection (unit 3) [TEPCO-2]


0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

-4000

-2000

0

2000

4000

6000

0 24 48 72 96 120 144

1F3

TAF

P r e s s . (

M P a )

a t e r

l e v e

l ( m m

)

()Observed dataRPV press.

Water level

Relative time (h)

3/12 3/13 3/14 3/15 3/16 3/17 3/18

Fig.3-2-2 RPV pressure and water level (unit 3) [TEPCO-2]



47/53

Attachment IV-2

47

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

2Pd

1Pd

3/12 3/13 3/14 3/15 3/16 3/17 3/18

P r e s s .

M P a

() Observed data

D/W press.

Relative time (h)

Date

Fig.3-2-3 D/W pressure (unit 3) [TEPCO-2]


0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 1440

100

200

300

400

500

600

2Pd

1Pd

3/12 3/13 3/14 3/15 3/16 3/17 3/18

P r e s s .

M P a

()Observed data

D/W press.

T e m p .

K

S/C press.

Saturation temp.

D/W temp.

S/P temp.

Relative time (h)

Date

Fig.3-2-4 PCV pressure and temperature (unit 3) [TEPCO-2]



48/53

Attachment IV-2

48

0

500

1000

1500

2000

2500

3000

0 24 48 72 96 120 144

1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

M a x

i m u m t e m p .

o f c o r e

( K )

Relative time (h)

Date

Fig.3-2-5 Maximum temperature of the core (unit 3) [TEPCO-2]


0

20

40

60

80

100

0 24 48 72 96 120 1440.0

0.2

0.4

0.6

0.8

1.0

1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

M a s s

( t o n

)

Intact fuel

Debris

R a t

i o ( - )

Relative time (h)

Date

Fig.3-2-6 Mass of the core (unit 3) [TEPCO-2]



49/53

Attachment IV-2

49

Top


Top


centert = 50 h

centert = 80 h

ratio1.0

0.8

0.6

0.4

0.2

0.0

ratio1.0

0.8

0.6

0.4

0.2

0.0

Fig.3-2-7 Distribution of intact fuel (unit 3) [TEPCO-2]

0

200

400

600

800

1000

1200

0 24 48 72 96 120 144

1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

H y d r o g e n

( k g )

Generated hydrogen

Leakage from PCV

Relative time (h)

Date

Fig.3-2-8 Hydrogen generation (unit 3) [TEPCO-2]




50/53

Attachment IV-2

50

0.0

0.1

0.2

0.3

0.4

0.5

0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )


F P r e


)

Relative time (h)

Date


Noble gas

0

1 10 -4

2 10 -4

3 10 -4

4 10 -4

5 10 -4

0

1 10 -3

2 10 -3

3 10 -3

4 10 -3

5 10 -3

0 24 48 72 96 120 144

CsICs

Te

Ba

1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )


F P r e

l e a s e r a t i o

( - )

Relative time (h)

Date


Fig.3-2-9 FP release ratio to the environment (1/2) (unit 3) [TEPCO-2]



51/53

Attachment IV-2

51

10 -5

10 -4

10 -3

10 -2

10 -1

10 0

10 -10

10 -8

10 -6

10 -4

10 -2

10 0

0 24 48 72 96 120 144


1F3

3/12 3/13 3/14 3/15 3/16 3/17 3/18

F P r e

l e a s e r a t i o

( - )


F P r e


)

Relative time (h)

Date


Fig.3-2-10 FP release ratio to the environment (2/2) (unit 3) [TEPCO-2]


0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

1F3

W/W

RPV

Environment

3/12 3/13 3/14 3/15 3/16 3/17 3/18

C s I d i s t r

i b u t

i o n

( - )

Relative time (h)

Date

Fig.3-2-11 Distribution of CsI (1/2)(unit 3) [TEPCO-2]



52/53

Attachment IV-2

52

10 -4

10 -3

10 -2

10 -1

100

0 24 48 72 96 120 144

1F3

W/W

RPV

Environment

3/12 3/13 3/14 3/15 3/16 3/17 3/18

D/W

E/B

C s I

d i s t r

i b u t

i o n

( - )

Relative time (h)

Date

Fig.3-2-12 Distribution of CsI (2/2)(unit 3) [TEPCO-2]


0.0

0.2

0.4

0.6

0.8

1.0

0 24 48 72 96 120 144

1F3

W.W

RPV

Environment

3/12 3/13 3/14 3/15 3/16 3/17 3/18

C s d i s t r i

b u t i o n

( - )

Relative time (h)

Date

Fig.3-2-13 Distribution of Cs (1/2)(unit 3) [TEPCO-2]



53/53

Attachment IV-2

0.0

0.0

0.0

0.1

1.0

0 24 48 72 96 120 144

1F3

W.W

RPV

Environment

3/12 3/13 3/14 3/15 3/16 3/17 3/18

D/W

R/B

C s

d i s t r i

b u t i o n

( - )

Relative time (h)

Date

Fig.3-2-14 Distribution of Cs (2/2)(unit 3) [TEPCO-2]


abstracts of the cross check analysison the evaluation of the cores of unit 1, 2 and 3 of fukkushima...

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