Fukushima Daiichi Nuclear Power Station Unit 1　Parameters of Temperature
(Typical Points)
425
400
375
[Note]
Some indicators might not be functioning properly beyond the normal
condition for usage affected by the earthquake and subsequent events.
We comprehensively evaluate situation in plants using all the available
information from indicators and also focusing on trends, taking uncertainty
of indicators into consideration.
Vessel
Fｌange
Vessel Flange
350
RPV Bellows Air
(HVH-12A)
325
300
Feedwater Nozzle
N4B （end）
275
Vessel Core
250
Safety Valve (exhaust air)
203-4A①
℃
225
S/C
200
175
RPV Bottom Part (Bottom head)
D/W HVH
Return Air Duct
（ HVH-12C）
150
CRD Housing
Upper Part
125
CRD Housing
Lower Part
100
75
S/C Pool
Water Temperature A
50
S/C Pool
Water Temperature B
25
0
3/ 20 3/ 27 4/ 3 4/ 10 4/ 17 4/ 24 5/ 1
5/ 8 5/ 15 5/ 22 5/ 29 6/ 5 6/ 12 6/ 19 6/ 26 7/ 3 7/ 10 7/ 17 7/ 24
Fukushima Daiichi Nuclear Power Station Unit 1　Parameters of
Temperature （Feedwater Nozzle and Safety Valve (Exhaust Air)）
425
400
375
[Note]
Some indicators might not be functioning properly beyond the normal
condition for usage affected by the earthquake and subsequent events.
We comprehensively evaluate situation in plants using all the available
information from indicators and also focusing on trends, taking uncertainty
of indicators into consideration.
350
Continuously measured temperatures of
feedwater nozzle, N48, and safety valve
(exhaust air), 203-4A, have been rising
since March 27. In order to compare them
with other similar points, some
measurement points have been added since
12:30 of March 28.
325
Feedwater Nozzle
N4B （end）
Feedwater Nozzle
N4B (inside)
Feedwater Nozzle
N4C (end)
Feedwater Nozzle
N4C (inside)
300
275
Safety Valve (exhaust air)
203-4A①
℃
250
Safety Valve (exhaust air)
203-4C②
225
6
7
200
Safety Valve (exhaust air)
203-4B③ exhaust air to
D/W
1
175
150
8
3
SR Valve (exhaust air)
203-3A⑥
2
9
SR Valve (exhaust air)
203-3B⑦
125
100
75
SR Valve (exhaust air)
203-3C⑧
50
SR Valve (exhaust air)
203-3D⑨ exhaust air to
S/C
25
0
3/20 3/27 4/3 4/10 4/17 4/24 5/1
5/8 5/15 5/22 5/29 6/5 6/12 6/19 6/26 7/3 7/10 7/17 7/24
Fukushima Daiichi Nuclear Power Station Unit1 Parameters of Temperature
[Note]
Some indicators might not be functioning properly beyond the normal condition for usage affected by the earthquake and subsequent events.
We comprehensively evaluate situation in plants using all the available information from indicators and also focusing on trends, taking
uncertainty
Date
7/21
7/21
7/21
7/21
7/21
7/21
7/21
7/21
7/22
7/22
7/22
7/22
7/22
7/22
7/22
7/22
7/23
7/23
7/23
7/23
7/23
7/23
7/23
7/23
7/24
7/24
7/24
7/24
7/24
7/24
7/24
7/24
7/25
7/25
7/25
7/25
7/25
7/25
7/25
7/25
7/26
7/26
7/26
7/26
7/26
7/26
7/26
7/26
7/27
7/27
7/27
7/27
2:00
5:00
8:00
11:00
14:00
17:00
20:00
23:00
2:00
5:00
8:00
11:00
14:00
17:00
20:00
23:00
2:00
5:00
8:00
11:00
14:00
17:00
20:00
23:00
2:00
5:00
8:00
11:00
14:00
17:00
20:00
23:00
2:00
5:00
8:00
11:00
14:00
17:00
20:00
23:00
2:00
5:00
8:00
11:00
14:00
17:00
20:00
23:00
2:00
5:00
8:00
11:00
Vessel Vessel
Fｌange Flange
96.2
95.9
95.8
95.8
95.8
95.7
95.5
95.5
95.3
95.2
95.4
95.7
95.8
96.0
96.1
96.1
96.2
96.0
96.0
96.3
96.4
96.5
96.5
96.5
96.6
96.6
96.8
96.9
96.8
96.8
96.7
96.6
96.4
96.3
96.3
96.4
96.5
96.5
96.3
96.3
96.2
96.1
96.1
96.2
96.3
96.4
96.3
96.1
96.2
96.2
96.2
96.1
96.2
96.0
95.9
95.9
95.9
95.8
95.5
95.5
95.3
95.3
95.5
95.7
95.9
96.1
96.2
96.1
96.2
96.1
96.1
96.4
96.5
96.6
96.6
96.6
96.6
96.7
96.8
97.0
96.9
96.9
96.8
96.6
96.5
96.3
96.3
96.4
96.6
96.6
96.4
96.4
96.2
96.1
96.1
96.2
96.3
96.4
96.3
96.2
96.2
96.2
96.2
96.1
Feedwater
Nozzle
N4B （end）
108.0
107.7
107.5
107.5
107.5
107.5
107.3
107.3
107.1
107.1
107.3
107.5
107.5
107.7
107.8
107.9
108.0
108.0
108.0
108.2
108.3
108.4
108.5
108.6
108.6
108.7
108.9
109.1
109.1
109.0
108.9
108.7
108.5
108.5
108.5
108.6
108.6
108.6
108.5
108.5
108.4
108.3
108.2
108.3
108.4
108.5
108.4
108.3
108.3
108.3
108.3
108.2
Feedwater
Nozzle
N4B (inside)
96.9
96.6
96.5
96.5
96.5
96.4
96.3
96.3
96.2
96.2
96.3
96.5
96.6
96.7
96.9
96.9
96.9
96.9
96.9
97.1
97.1
97.2
97.2
97.2
97.3
97.3
97.4
97.5
97.4
97.3
97.3
97.1
97.0
96.8
96.8
96.9
97.0
96.9
96.8
96.8
96.7
96.6
96.6
96.6
96.7
96.8
96.7
96.6
96.6
96.6
96.7
96.6
Feedwater
Nozzle
N4C (end)
96.1
95.9
95.8
95.8
95.8
95.7
95.5
95.5
95.3
95.3
95.4
95.6
95.8
96.0
96.1
96.0
96.1
95.9
96.0
96.2
96.3
96.3
96.4
96.4
96.4
96.5
96.5
96.7
96.7
96.6
96.5
96.3
96.2
96.0
96.0
96.1
96.2
96.2
96.0
96.0
95.9
95.8
95.7
95.8
95.9
96.0
95.9
95.8
95.8
95.8
95.8
95.7
Feedwater
Nozzle
N4C (inside)
95.8
95.6
95.4
95.4
95.4
95.4
95.1
95.1
95.0
94.9
95.0
95.2
95.4
95.6
95.7
95.7
95.7
95.6
95.6
95.8
95.9
96.0
96.0
96.0
96.0
96.1
96.1
96.3
96.2
96.2
96.1
95.9
95.8
95.6
95.6
95.7
95.8
95.8
95.6
95.6
95.5
95.4
95.3
95.3
95.5
95.6
95.5
95.3
95.4
95.3
95.4
95.3
Safety
Safety
SR Valve SR Valve SR Valve SR Valve
Safety Valve
CRD
RPV Bottom CRD
Vessel
Valve
Valve
(exhaust (exhaust (exhaust (exhaust
(exhaust air)
Housing
Part (Bottom Housing
Core
(exhaust air) (exhaust air)
air)
air)
air)
air)
Upper Part Lower Part 203-4A①
head)
203-4C② 203-4B③ 203-3A⑥ 203-3B⑦ 203-3C⑧ 203-3D⑨
96.1
96.7
96.9
96.8
103.6
99.9
98.5
99.2
98.1
99.4
96.9
95.9
96.5
96.7
96.6
103.3
99.6
98.2
98.9
97.8
99.2
96.7
95.7
96.4
96.5
96.4
103.2
99.5
98.1
98.8
97.7
99.0
96.5
95.7
96.3
96.5
96.4
103.2
99.5
98.0
98.8
97.8
99.1
96.5
95.7
96.3
96.5
96.4
103.3
99.5
98.1
98.8
97.7
99.0
96.5
95.7
96.3
96.5
96.4
103.2
99.4
98.0
98.8
97.7
99.0
96.4
95.5
96.1
96.3
96.2
103.0
99.2
97.8
98.5
97.4
98.8
96.2
95.4
96.0
96.3
96.2
103.0
99.2
97.8
98.4
97.4
98.7
96.2
95.2
95.8
96.2
96.1
102.9
99.1
97.6
98.2
97.1
98.5
95.9
95.2
95.8
96.1
96.0
102.8
99.0
97.5
98.1
97.0
98.4
95.9
95.4
96.0
96.3
96.2
103.0
99.1
97.7
98.4
97.3
98.7
96.1
95.6
96.2
96.4
96.3
103.2
99.3
97.9
98.7
97.5
98.9
96.4
95.7
96.4
96.6
96.5
103.4
99.5
98.0
98.9
97.8
99.1
96.5
95.9
96.5
96.7
96.6
103.7
99.7
98.2
99.1
97.9
99.3
96.7
96.0
96.6
96.8
96.7
103.8
99.8
98.3
99.2
98.1
99.4
96.8
96.0
96.6
96.8
96.8
103.8
99.8
98.3
99.1
98.0
99.4
96.7
96.0
96.6
96.9
96.8
103.9
99.9
98.3
99.2
98.0
99.4
96.8
95.9
96.5
96.8
96.7
103.8
99.8
98.2
99.0
97.9
99.3
96.6
95.9
96.5
96.8
96.7
103.7
99.7
98.2
99.0
97.8
99.2
96.6
96.1
96.8
97.0
96.9
104.0
100.0
98.4
99.3
98.2
99.5
96.9
96.2
96.9
97.1
97.0
104.2
100.2
98.5
99.5
98.3
99.7
97.0
96.3
96.9
97.1
97.0
104.3
100.2
98.6
99.5
98.4
99.7
97.0
96.3
97.0
97.1
97.0
104.4
100.2
98.6
99.6
98.4
99.8
97.1
96.3
96.9
97.1
97.1
104.4
100.3
98.6
99.7
98.5
99.9
97.1
96.3
97.0
97.2
97.1
104.5
100.3
98.7
99.7
98.5
99.9
97.1
96.4
97.0
97.2
97.1
104.5
100.4
98.7
99.8
98.6
100.0
97.2
96.5
97.1
97.2
97.1
104.6
100.5
98.8
99.9
98.7
100.1
97.3
96.6
97.2
97.3
97.3
104.7
100.6
99.0
100.1
98.8
100.2
97.3
96.5
97.2
97.3
97.2
104.8
100.6
99.0
100.0
98.8
100.2
97.4
96.5
97.1
97.2
97.1
104.5
100.5
98.9
100.0
98.7
100.1
97.2
100.0
97.2
96.4
97.0
97.1
97.0
104.4
100.3
98.8
99.8
98.6
96.3
96.9
97.0
96.9
104.3
100.2
98.6
99.6
98.4
99.8
97.0
96.1
96.8
96.9
96.8
104.1
100.0
98.5
99.5
98.3
99.7
96.9
96.0
96.6
96.7
96.6
104.0
99.9
98.3
99.4
98.2
99.6
96.7
96.0
96.6
96.7
96.6
104.2
99.9
98.2
99.4
98.2
99.6
96.7
96.0
96.6
96.8
96.7
104.3
100.0
98.3
99.5
98.3
99.7
96.8
96.1
96.8
96.8
96.8
104.4
100.1
98.4
99.7
98.5
99.8
96.9
96.2
96.8
96.8
96.7
104.4
100.1
98.4
99.7
98.4
99.8
96.9
96.0
96.6
96.7
96.6
104.2
100.0
98.2
99.5
98.3
99.6
96.7
96.0
96.5
96.7
96.6
104.2
100.0
98.3
99.4
98.2
99.6
96.7
95.9
96.5
96.6
96.5
104.2
99.9
98.1
99.3
98.1
99.5
96.6
95.7
96.4
96.5
96.4
104.0
99.8
98.0
99.2
98.0
99.4
96.5
95.7
96.3
96.4
96.3
104.0
99.7
97.9
99.1
98.0
99.3
96.4
95.7
96.3
96.4
96.3
104.1
99.7
98.0
99.2
98.0
99.3
96.5
95.9
96.5
96.6
96.5
104.2
99.9
98.1
99.3
98.1
99.5
96.6
95.9
96.6
96.7
96.6
104.3
99.9
98.2
99.3
98.2
99.5
96.7
95.9
96.4
96.6
96.5
104.2
99.8
98.1
99.2
98.1
99.4
96.6
95.7
96.3
96.5
96.4
103.9
99.7
98.0
99.1
97.9
99.3
96.5
95.8
96.4
96.5
96.4
104.1
99.7
98.0
99.1
98.0
99.4
96.5
95.8
96.3
96.5
96.4
104.1
99.7
98.0
99.1
98.0
99.3
96.5
95.7
96.3
96.5
96.4
104.1
99.7
97.9
99.1
98.0
99.3
96.5
95.7
96.3
96.4
96.3
104.0
99.6
97.8
99.0
97.9
99.2
96.4
1/1
D/W HVH
Return Air Duct
（ HVH-12C）
97.8
97.6
97.5
97.4
97.4
97.4
97.3
97.3
97.1
97.1
97.3
97.4
97.6
97.7
97.8
97.9
97.9
97.8
97.8
97.9
98.0
98.1
98.1
98.1
98.2
98.2
98.3
98.4
98.4
98.3
98.2
98.1
98.0
97.9
97.8
97.9
97.9
97.9
97.8
97.8
97.8
97.7
97.6
97.6
97.7
97.7
97.7
97.6
97.6
97.6
97.6
97.6
S/C Pool S/C Pool
RPV
Water
Water
Bellows Air
(HVH-12A) Temperatu Temperatu
96.4
96.1
96.0
96.0
96.2
96.0
95.8
95.7
95.5
95.5
95.6
95.9
96.2
96.3
96.4
96.3
96.3
96.2
96.2
96.4
96.6
96.6
96.6
96.7
96.8
96.8
96.9
97.0
97.0
97.0
96.9
96.7
96.6
96.3
96.3
96.4
96.5
96.6
96.4
96.3
96.2
96.1
96.0
96.0
96.3
96.2
96.2
96.1
95.9
96.0
96.0
96.0
re A
47.9
47.8
47.8
47.7
47.7
47.6
47.5
47.5
47.4
47.4
47.3
47.3
47.2
47.2
47.1
47.1
47.0
47.0
46.9
46.9
46.9
46.8
46.8
46.7
46.7
46.6
46.6
46.6
46.5
46.5
46.5
46.5
46.4
46.4
46.4
46.4
46.3
46.3
46.3
46.3
46.2
46.2
46.2
46.2
46.2
46.2
46.2
46.2
46.1
46.1
46.1
46.1
re B
47.7
47.6
47.5
47.5
47.4
47.4
47.3
47.2
47.2
47.2
47.1
47.1
47.0
47.0
46.9
46.8
46.8
46.8
46.7
46.7
46.6
46.6
46.6
46.5
46.5
46.4
46.4
46.4
46.3
46.3
46.3
46.3
46.2
46.2
46.2
46.2
46.1
46.1
46.1
46.1
46.0
46.0
46.0
46.0
45.9
46.0
45.9
45.9
45.9
45.9
45.9
45.9
note