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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
Case-2 Based on the utility s analysis No.1, but
PCV leakage area is ca. 50 cm 2.
Fig.2-4-1
Case-3 Based on the utility s analysis No.1, but
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
Event Results (this work) 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)
RPV failure 2 50, Mar. 12 12 hours (relative time) 15 hours (relative time)
Table 1-3 Result of analysis on Unit 1 [case 2] 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)
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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)
Table 2-2 Result of analysis on Unit 2 [TEPCO-2] and comparison to the utility s result
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)
Table 3-1 Result of analysis on Unit 3 [TEPCO-1] and comparison to the utility s result
Event Results (this work) Utility s result (No. 1)
Core exposure 7 40, Mar 13 41 hours (relative time) 40 hours (relative time)
Core damage 10 20, Mar 13 44 hours (relative time) 42 hours (relative time)RPV failure
(RPV doesn t fail)
(RPV doesn t fail)
Table 3-2 Result of analysis on Unit 3 [TEPCO-2] and comparison to the utility s result
Event Results (this work) Utility s result (No. 2)
Core exposure 7 40, Mar 13 41 hours (relative time) 40 hours (relative time)
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]
IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)
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
Bottomperiphery periphery
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]
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
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
l e a s e r a t i o ( -
)
Relative time (h)
Date
Fig. 1-1-9 FP release ratio to the environment (2/2) (unit 1) [TEPCO]
IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)
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]
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
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),
sea water inject., expansion of PCV failure (assumption)
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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]
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
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]
IC stop, PCV failure (assumption), W/W ventilation (open), W/W ventilation (close), sea water inject., expansion of PCV failure (assumption)
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]
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. 1-3-5 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
Bottomperiphery periphery
Top
Bottomperiphery periphery
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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Attachment IV-2
21
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]
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
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]
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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Attachment IV-2
22
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]
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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Attachment IV-2
23
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),
sea water inject., expansion of PCV failure (assumption)
-
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Attachment IV-2
24
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]
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
-
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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]
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
-
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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]
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
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
-
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Attachment IV-2
27
Top
Bottomperiphery periphery
Top
Bottomperiphery periphery
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]
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
-
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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
( - )
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. 2-1-10 FP release ratio to the environment (2/3) (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
-
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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
( - )
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
Solid line (left axis)Dashed line (right axis)
Fig. 2-1-11 FP release ratio to the environment (3/3) (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
0.0
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]
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
-
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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]
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
-
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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
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 )
Total
Fire protection
Relative time (h)
Date
Fig. 2-2-1 Amount of water injection (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
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]
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
-
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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]
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
-
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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]
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
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
-
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Attachment IV-2
34
Top
Bottomperiphery periphery
Top
Bottomperiphery periphery
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]
-
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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]
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
0.000
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
Noble gas(accumulated)
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
Fig. 2-2-9 FP release ratio to the environment (1/2) (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
-
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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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
Noble gasCsICsTeBaRuCeLa
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
Solid line (left axis)Dashed line (right axis)
Fig. 2-2-10 FP release ratio to the environment (2/2) (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 96 120 144
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]
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
-
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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]
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
-
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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
-
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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)
Fig. 2-4-1 D/W pressure (unit 2) [case-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 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. 2-5-1 D/W pressure (unit 2) [case-3]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
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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
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 )
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)
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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]
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
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]
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)
-
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Attachment IV-2
43
Top
Bottomperiphery periphery
t = 50 h
Top
Bottomperiphery periphery
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]
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)
-
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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
( - )
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
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
Noble gasCsICsTeBaRuCeLa
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
( - )
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
Solid line (left axis)Dashed line (right axis)
Fig.3-1-9 FP release ratio to the environment (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)
-
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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]
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
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]
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)
-
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Attachment IV-2
46
0
50
100
150
200
0
500
1000
1500
2000
0 24 48 72 96 120 144
1F3
HPCI
RCIC
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 )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]
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
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]
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)
-
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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]
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
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]
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)
-
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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]
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
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]
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)
-
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Attachment IV-2
49
Top
Bottomperiphery periphery
Top
Bottomperiphery periphery
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]
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)
-
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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
( - )
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
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
( - )
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
Solid line (left axis)Dashed line (right axis)
Fig.3-2-9 FP release ratio to the environment (1/2) (unit 3) [TEPCO-2]
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)
-
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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
Noble gasCsICsTeBaRuCeLa
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
( - )
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
Solid line (left axis)Dashed line (right axis)
Fig.3-2-10 FP release ratio to the environment (2/2) (unit 3) [TEPCO-2]
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
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]
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)
-
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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]
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
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]
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)
-
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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]
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)