Amount of Water Injection to the RPV of Fukushima Daiichi Nuclear Power Station Unit 1 ～ 3 <Estimation>（Commence of sea water injection *)～as of 8:00 am, May 15th 2011）*)On March 12th, 80kL of fresh water inection to Unit 1 was conducted before sea water injection. Some amount of fresh water injection to Unit 3 was conducted before the water source was switched to sea water on March 13th.

（note）Since above amount of water injection includes number, which was calculated by temporary flow meter and excludes temporary change of water inflow
actual amount of water injection to the RPV may slightly differ.
Unit 1
Unit 2dateamount of water（per day）
cumulative（sea water） cumulative（fresh water）
amount of water（per day）
cumulative（sea water）
2011/3/12 approx.
31 kL （sea water）
approx.
31 kL
2011/3/13 approx. 259 kL （sea water）
approx.
290 kL2011/3/14 approx.
56 kL （sea water）
approx.
346 kLapprox. 320 kL （sea water）
approx.
320 kL2011/3/15 approx. 259 kL （sea water）
approx.
605 kLapprox. 1,872 kL （sea water）
approx. 2,192 kL
2011/3/16 approx. 259 kL （sea water）
approx.
864 kLapprox. 1,872 kL （sea water）
approx. 4,064 kL
2011/3/17 approx. 294 kL （sea water）
approx. 1,158 kL
approx. 1,157 kL （sea water）
approx. 5,221 kL
2011/3/18 approx. 475 kL （sea water）
approx. 1,633 kL
approx. 802 kL （sea water）
approx. 6,023 kL
2011/3/19 approx. 449 kL （sea water）
approx. 2,082 kL
approx. 711 kL （sea water）
approx. 6,734 kL
2011/3/20 approx.
48 kL （sea water）
approx. 2,130 kL
approx. 480 kL （sea water）
approx. 7,214 kL
2011/3/21 approx.
38 kL （sea water）
approx. 2,167 kL
approx. 384 kL （sea water）
approx. 7,598 kL
2011/3/22 approx.
42 kL （sea water）
approx. 2,209 kL
approx. 261 kL （sea water）
approx. 7,860 kL
2011/3/23 approx. 301 kL （sea water）
approx. 2,510 kL
approx. 279 kL （sea water）
approx. 8,138 kL
2011/3/24 approx. 226 kL （sea water）
approx. 2,736 kL
approx. 278 kL （sea water）
approx. 8,416 kL
approx. 2,842 kL
2011/3/25 approx. 106 kL （sea water）
approx. 478 kL （sea water）
approx. 8,894 kL
approx.
60 kL （fresh water）
approx.
60 kL
approx. 207 kL （sea water）
approx. 9,101 kL
2011/3/26 approx. 173 kL （fresh water）
approx.
233 kLapprox. 245 kL （fresh water）
2011/3/27 approx. 169 kL （fresh water）
approx.
402 kLapprox. 382 kL （fresh water）
2011/3/28 approx. 169 kL （fresh water）
approx.
571 kLapprox. 169 kL （fresh water）
2011/3/29 approx. 196 kL （fresh water）
approx.
767 kLapprox. 168 kL （fresh water）
2011/3/30 approx. 192 kL （fresh water）
approx.
958 kLapprox. 192 kL （fresh water）
2011/3/31 approx. 192 kL （fresh water）
approx. 1,150 kL
approx. 216 kL （fresh water）
2011/4/1 approx. 184 kL （fresh water）
approx. 1,334 kL
approx. 216 kL （fresh water）
2011/4/2 approx. 165 kL （fresh water）
approx. 1,499 kL
approx. 213 kL （fresh water）
2011/4/3 approx. 147 kL （fresh water）
approx. 1,646 kL
approx. 192 kL （fresh water）
2011/4/4 approx. 144 kL （fresh water）
approx. 1,790 kL
approx. 192 kL （fresh water）
2011/4/5 approx. 144 kL （fresh water）
approx. 1,934 kL
approx. 192 kL （fresh water）
2011/4/6 approx. 144 kL （fresh water）
approx. 2,078 kL
approx. 192 kL （fresh water）
2011/4/7 approx. 144 kL （fresh water）
approx. 2,222 kL
approx. 187 kL （fresh water）
2011/4/8 approx. 144 kL （fresh water）
approx. 2,366 kL
approx. 168 kL （fresh water）
2011/4/9 approx. 144 kL （fresh water）
approx. 2,510 kL
approx. 168 kL （fresh water）
2011/4/10 approx. 144 kL （fresh water）
approx. 2,654 kL
approx. 168 kL （fresh water）
2011/4/11 approx. 139 kL （fresh water）
approx. 2,793 kL
approx. 162 kL （fresh water）
2011/4/12 approx. 144 kL （fresh water）
approx. 2,937 kL
approx. 168 kL （fresh water）
2011/4/13 approx. 144 kL （fresh water）
approx. 3,081 kL
approx. 168 kL （fresh water）
2011/4/14 approx. 144 kL （fresh water）
approx. 3,225 kL
approx. 168 kL （fresh water）
2011/4/15 approx. 144 kL （fresh water）
approx. 3,369 kL
approx. 167 kL （fresh water）
2011/4/16 approx. 144 kL （fresh water）
approx. 3,513 kL
approx. 168 kL （fresh water）
2011/4/17 approx. 144 kL （fresh water）
approx. 3,657 kL
approx. 168 kL （fresh water）
2011/4/18 approx. 144 kL （fresh water）
approx. 3,801 kL
approx. 168 kL （fresh water）
2011/4/19 approx. 144 kL （fresh water）
approx. 3,945 kL
approx. 168 kL （fresh water）
2011/4/20 approx. 134 kL （fresh water）
approx. 4,079 kL
approx. 168 kL （fresh water）
2011/4/21 approx. 139 kL （fresh water）
approx. 4,218 kL
approx. 169 kL （fresh water）
2011/4/22 approx. 144 kL （fresh water）
approx. 4,362 kL
approx. 168 kL （fresh water）
2011/4/23 approx. 143 kL （fresh water）
approx. 4,505 kL
approx. 166 kL （fresh water）
2011/4/24 approx. 143 kL （fresh water）
approx. 4,649 kL
approx. 167 kL （fresh water）
2011/4/25 approx. 143 kL （fresh water）
approx. 4,792 kL
approx. 168 kL （fresh water）
2011/4/26 approx. 145 kL （fresh water）
approx. 4,937 kL
approx. 167 kL （fresh water）
2011/4/27 approx. 200 kL （fresh water）
approx. 5,136 kL
approx. 167 kL （fresh water）
2011/4/28 approx. 240 kL （fresh water）
approx. 5,376 kL
approx. 168 kL （fresh water）
2011/4/29 approx. 185 kL （fresh water）
approx. 5,562 kL
approx. 167 kL （fresh water）
2011/4/30 approx. 144 kL （fresh water）
approx. 5,706 kL
approx. 166 kL （fresh water）
2011/5/1 approx. 144 kL （fresh water）
approx. 5,850 kL
approx. 166 kL （fresh water）
2011/5/2 approx. 143 kL （fresh water）
approx. 5,993 kL
approx. 168 kL （fresh water）
2011/5/3 approx. 143 kL （fresh water）
approx. 6,136 kL
approx. 168 kL （fresh water）
2011/5/4 approx. 144 kL （fresh water）
approx. 6,280 kL
approx. 167 kL （fresh water）
2011/5/5 approx. 144 kL （fresh water）
approx. 6,424 kL
approx. 168 kL （fresh water）
2011/5/6 approx. 172 kL （fresh water）
approx. 6,596 kL
approx. 168 kL （fresh water）
2011/5/7 approx. 192 kL （fresh water）
approx. 6,788 kL
approx. 168 kL （fresh water）
2011/5/8 approx. 192 kL （fresh water）
approx. 6,980 kL
approx. 168 kL （fresh water）
2011/5/9 approx. 192 kL （fresh water）
approx. 7,172 kL
approx. 168 kL （fresh water）
2011/5/10 approx. 192 kL （fresh water）
approx. 7,364 kL
approx. 167 kL （fresh water）
2011/5/11 approx. 191 kL （fresh water）
approx. 7,556 kL
approx. 168 kL （fresh water）
2011/5/12 approx. 190 kL （fresh water）
approx. 7,746 kL
approx. 167 kL （fresh water）
2011/5/13 approx. 191 kL （fresh water）
approx. 7,936 kL
approx. 166 kL （fresh water）
2011/5/14 approx. 192 kL （fresh water）
approx. 8,128 kL
approx. 168 kL （fresh water）
2011/5/15 approx. 213 kL （fresh water）
approx. 8,341 kL
approx. 168 kL （fresh water）
total

Approx.

11,183kL

total

Approx.

cumulative（fresh water）

approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.

18,216245 kL627 kL797 kL
965 kL
1,157 kL
1,373 kL
1,589 kL
1,802 kL
1,994 kL
2,185 kL
2,377 kL
2,568 kL
2,755 kL
2,923 kL
3,091 kL
3,259 kL
3,421 kL
3,589 kL
3,757 kL
3,925 kL
4,092 kL
4,260 kL
4,428 kL
4,595 kL
4,763 kL
4,931 kL
5,100 kL
5,268 kL
5,434 kL
5,601 kL
5,769 kL
5,936 kL
6,103 kL
6,271 kL
6,438 kL
6,604 kL
6,769 kL
6,937 kL
7,105 kL
7,272 kL
7,440 kL
7,608 kL
7,776 kL
7,944 kL
8,112 kL
8,279 kL
8,446 kL
8,613 kL
8,779 kL
8,947 kL
9,115 kL
kL

Refernce-1 shows the amount of water injection to the RPV which is calculated by readings of flow indicator of fire pump during the period werecorded the water amount of accident management panel (from March 18 to 25th, 2011, though this period differ depend on the unit) .

amount of water （per day）

Unit 3cumulative （sea water） cumulative （fresh water）

approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.

389 kL （sea water）
505 kL （sea water）
774 kL （sea water）
864 kL （sea water）
490 kL （sea water）
360 kL （sea water）
494 kL （sea water）
393 kL （sea water）
24 kL （sea water）
24 kL （sea water）
24 kL （sea water）
69 kL （sea water）
271 kL （sea water）
88 kL （fresh water）

approx.

88 kL

approx.

336 kL （fresh water）

approx.

424 kLapprox.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.

311 kL （fresh water）
295 kL （fresh water）
241 kL （fresh water）
167 kL （fresh water）
167 kL （fresh water）
167 kL （fresh water）
167 kL （fresh water）
173 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
162 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
168 kL （fresh water）
144 kL （fresh water）
154 kL （fresh water）
161 kL （fresh water）
160 kL （fresh water）
163 kL （fresh water）
164 kL （fresh water）
161 kL （fresh water）
161 kL （fresh water）
163 kL （fresh water）
159 kL （fresh water）
156 kL （fresh water）
157 kL （fresh water）
163 kL （fresh water）
165 kL （fresh water）
195 kL （fresh water）
216 kL （fresh water）
216 kL （fresh water）
216 kL （fresh water）
216 kL （fresh water）
216 kL （fresh water）
216 kL （fresh water）
216 kL （fresh water）
235 kL （fresh water）
287 kL （fresh water）
337 kL （fresh water）
370 kL （fresh water）

approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.

735 kL
1,030 kL
1,271 kL
1,438 kL
1,605 kL
1,772 kL
1,939 kL
2,112 kL
2,280 kL
2,448 kL
2,616 kL
2,784 kL
2,952 kL
3,120 kL
3,288 kL
3,450 kL
3,618 kL
3,786 kL
3,954 kL
4,122 kL
4,290 kL
4,458 kL
4,626 kL
4,794 kL
4,938 kL
5,092 kL
5,254 kL
5,413 kL
5,576 kL
5,741 kL
5,902 kL
6,063 kL
6,226 kL
6,386 kL
6,542 kL
6,699 kL
6,861 kL
7,027 kL
7,222 kL
7,438 kL
7,654 kL
7,870 kL
8,086 kL
8,302 kL
8,518 kL
8,733 kL
8,968 kL
9,255 kL
9,592 kL
9,963 kL

total

approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.
approx.

389 kL893 kL
1,667 kL
2,531 kL
3,021 kL
3,381 kL
3,875 kL
4,268 kL
4,292 kL
4,316 kL
4,340 kL
4,409 kL
4,680 kL

Approx.

14,643kL

＜Reference-１＞
Water injection into the reactor of Fukushima Daiichi NPS Unit 1～3
Below are the water injction volume calculated from the data of meter reading of flow meter of fire fighter pump for reference during the period when measuring was conducted by accident management panel (AM panel).
※In the case of fire fighter pump where there is no flow meter, calculation was made by translating pressure gauge readings or estimated from the specification of fire fighting pump.
(Note 1) The calculated amount of flow may differ from the actual amount of water injected into the reactor as it includes the result of temporary flow meter estimate and does not take temporary flow rate change into account.
(Note 2) If data was switched between AM panel and flow meter of fire fighter pump※ on the same day, summantion of both data was calculated.
example) When calculating the amount on the date of March 19, (1)if flow amount was calculated from the readings of flow meter of fire fighter pump until 12:00 am, (2)and after that, if the amount was measured by AM panel until 24:00 on the same day, it is calculated as (1)+(2).

Status of instruments (reference)Calculated from the readings of AM panel

Water injection <rough estimate> into the reactor of Unit 1-3 of Fukushima Daiichi NPS
date
2011/3/17
2011/3/18
2011/3/19
2011/3/20
2011/3/21
2011/3/22
2011/3/23
2011/3/24
2011/3/25
2011/3/26

Fukushima Daiichi NPS Unit 1
volume (per day)accumulated （sea water）
approx. 294 kL （sea water） approx. 1,158 kL
approx. 475 kL （sea water） approx. 1,633 kL
approx. 449 kL （sea water） approx. 2,082 kL
approx.
48 kL （sea water） approx. 2,130 kL
approx.
38 kL （sea water） approx. 2,167 kL
approx.
42 kL （sea water） approx. 2,209 kL
approx. 301 kL （sea water） approx. 2,510 kL
approx. 226 kL （sea water） approx. 2,736 kL
approx. 106 kL （sea water） approx. 2,842 kL
approx.
60 kL （fresh water）

approx.

60 kL

approx.

approx.

233 kL

173 kL （fresh water）
total*total until May 15

approx.

accumulated (fresh water)

11,183

2011/3/17
2011/3/18
2011/3/19
2011/3/20
2011/3/21
2011/3/22
2011/3/23
2011/3/24
2011/3/25
2011/3/26*total until May 15

approx.

approx.

233 kLapprox.

15,512

8,894 kL

approx.
approx.

207 kL （sea water） approx.
245 kL （fresh water）

9,101 kL

accumulated (fresh water)

flow rate adjustment
configuration changed to two pumps

flow rate adjustment（swtch to feed water line）
flow adjustmentkL

approx.
approx.

18,216245 kLapprox.

336 kL （fresh water）
total

kL

（Notwithstanding the notes, adjustment of flow rate and change of pump configulation are conducted time to time depends of plant parameter）

60 kL

total

approx.

Fukushima Daiichi NPS Unit 3
volume (per day)accumulated （sea water） accumulated (fresh water)
approx. 490 kL （sea water） approx. 3,021 kL
approx. 360 kL （sea water） approx. 3,381 kL
approx. 494 kL （sea water） approx. 3,875 kL
approx. 393 kL （sea water） approx. 4,268 kL
approx.
24 kL （sea water） approx. 4,292 kL
unstable readings
approx.
24 kL （sea water） approx. 4,316 kLflow meter fault
approx.
24 kL （sea water） approx. 4,340 kL
approx.
69 kL （sea water） approx. 4,409 kL（temporary downscale had been observedapprox.
271 kL （sea water） approx. 4,680 kL
approx.
88 kL （fresh water）
approx.
88 kL

Notes to where the large variation was observed (estimate)approx.

configuration change to one pump

478 kL （sea water）

total

Fukushima Daiichi NPS Unit 1
volume (per day)accumulated （sea water）
approx. 294 kL （sea water） approx. 1,158 kL
approx. 475 kL （sea water） approx. 1,633 kL
approx. 475 kL （sea water） approx. 2,109 kL
approx. 1,020 kL （sea water） approx. 3,129 kL
approx. 1,317 kL （sea water） approx. 4,446 kL
approx. 1,593 kL （sea water） approx. 6,039 kL
approx. 799 kL （sea water） approx. 6,839 kL
approx. 226 kL （sea water） approx. 7,065 kL
approx. 106 kL （sea water） approx. 7,171 kL
approx.
60 kL （fresh water）
173 kL （fresh water）

approx.

kL＜Reference＞ AM panel⇒Readings of the fire fighter pump flowmeter etc ※date

Fukushima Daiichi NPS Unit 2
volume (per day)accumulated （sea water） accumulated (fresh water)
approx. 1,157 kL （sea water） approx. 5,221 kL
approx.
802 kL （sea water） approx. 6,023 kL
approx.
711 kL （sea water） approx. 6,734 kL
approx.
480 kL （sea water） approx. 7,214 kL
approx.
384 kL （sea water） approx. 7,598 kL
approx.
261 kL （sea water） approx. 7,860 kL
unstable readings
approx.
279 kL （sea water） approx. 8,138 kL（recovered later）
approx.
278 kL （sea water） approx. 8,416 kLflow meter downscale

Fukushima Daiichi NPS Unit 2
volume (per day)accumulated （sea water） accumulated (fresh water)
approx. 1,157 kL （sea water） approx. 5,221 kL
flow adjustment
approx.
791 kL （sea water） approx. 6,012 kL
approx.
784 kL （sea water） approx. 6,796 kL
approx.
792 kL （sea water） approx. 7,588 kL
approx.
811 kL （sea water） approx. 8,399 kL
approx.
816 kL （sea water） approx. 9,215 kL
approx.
806 kL （sea water） approx. 10,021 kL
approx.
785 kL （sea water） approx. 10,806 kL
approx.

483 kL （sea water）

approx.
approx.

207 kL （sea water） approx. 11,497 kL
245 kL （fresh water）
total

approx. 11,289 kL

approx.

flow adjustment

approx.
20,612245 kLkL

approx.
approx.

14,643424 kLkL

Calculated AM panerl⇒Readings of fire fighter
pump flowmeter etc※

Fukushima Daiichi NPS Unit 3
volume (per day)accumulated （sea water） accumulated (fresh water)
approx. 490 kL （sea water）
約 3,021 kL
approx. 360 kL （sea water）
約 3,381 kL
approx. 494 kL （sea water）
約 3,875 kL
configuration changed to two pumps
approx. 1,321 kL （sea water）
約 5,196 kL
approx. 1,625 kL （sea water）
約 6,821 kL
approx. 1,637 kL （sea water）
約 8,458 kL
approx. 1,633 kL （sea water）
約 10,091 kL
flow adjustment
approx. 1,481 kL （sea water）
約 11,572 kL
one pump stopped
approx. 271 kL （sea water）
約 11,843 kL
configuration changed to two pumpsapprox.
approx.
88 kL （fresh water）
88 kL
approx.

336 kL （fresh water）
total

approx.
approx.

21,805424 kLkL