Outline of Water Injection to Reactors
by Fire Engines<Legend>: Water supply: Hose installation only (no water supply): Water pumping to fire engine tank
: Move of fire engine○○: Fire engine of ○○R/B: Reactor building
T/B: Turbine building

1F: Fukushima Daiichi Nuclear Power Plant
2F: Fukushima Daiini Nuclear Power Plant
KK: Kashiwazaki Kariwa Nuclear Power Plant
SD: Self-Defense Forces PF: Public Fire Station

(1) Status after Tsunami(Mar 11 around 15:40)

Waterstoragetank#4

Waterstoragetank

T/B

T/B

No seawaterFire engine house#3
R/B

Reversecleaning valve pit

1F?

Impassable due toroad damage anddebris carried bytsunami

R/B

Water supply inlet

Unit 5/6

1F

Water supply inlet
Reversecleaning valve pit

Seawater exist#2
Waterstorage
tank

#1

R/B

Impassable because thetanks carried by tsunami
blocked the way

R/B

T/B

T/B

Water supply inlet

Water supply inlet

Reversecleaning valve pit

Reversecleaning valve pit

No seawater

No seawater
1F

Breakdown due to tsunami

OutlineWaterstoragetank

Waterstorage
tankShallow
draft quay

・Status of 3 fire engines deployed at the power plant:
・One fire engine deployed in the fire engine house on a hill was usable.
・One fire engine deployed near the safeguard headquarters on the Units 1-4 side was broken down due to tsunami.
・One fire engine deployed on the Units 5/6 side was not usable because the passage to the Units 5/6 side wasinterrupted due to road damage and debris carried by tsunami, and there was information that the fire engine wasswept up by tsunami.

Sea

(2) Start of freshwater injection to Unit 1(Mar 12 around 4:00)

Waterstoragetank

#4

Water
storage
tank

#3
Water
storagetank<Breakdown/status not confirmed>
1F

#2

#1

R/B

R/B

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit
1FOutline

Water
storagetank<Standby>* Fire engines not described in thechart are listed within the above dotline boxes.
1F

Water
storagetank・Around 3:30 TEPCO employees and partner companies went to the site and found the Unit 1 power supply inlet.
Around 4:00 the water (about 1300L) stored in the fire engine was injected.
・During the attempt to use the water stored in the broken down fire engine, around 4:20 the staff returned to theseismic isolated building by fire engine due to increased radiation dose.

Shallow
draft quaySea

(3) Restart of freshwater injection to Unit 1(Mar 12 around 5:46)

Water
storage
tank

#4

Water
storage
tank

#3
Water
storagetank<Breakdown/status not confirmed>
1F

#2

#1

R/B

R/B

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Waterstoragetank

Water
storagetank

1F<Standby>

1F

Outline・Self-Defense Forces and partner companies went to the site by fire engine and restarted the water
injection at 5:46.

Shallow
draft quaySea

(4) Start of continuous injection, and arrival of support fire engines(Mar 12 in the morning)<Breakdown/status not confirmed>
1F

1F

1F/2F
Water
storage
tank

#4

Water
storage
tank

#3
Water
storage
tank

#2

#1

R/B

R/B

<Standby>

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

KKSDWaterstoragetankWaterstoragetankSD

1FShallow
draft quayOutline
・Continuous water injection line from the water storage tank to water supply inlet was installed to inject water.
・KK arrived at the site around 10:30, and the fire engine of Self-Defense Forces arrived before noon. Water was suppliedSea
fromwater storage tanks around the site to the water storage tanks to the Unit 1 side.
・In addition, 1 chemical fire engine shared by 1F and 2F was moved from 2F. (The fire engine was not used actually becauseof its old model.)From the seismic
isolated building(5) Hydrogen explosion at Unit 1(Mar 12 15:36)<Breakdown/status not confirmed>
1F

1F

1F/2FWater
storage
tank

#4

Water
storage
tank

#3
Water
storage
tank

#2

#1

R/B

R/B

<Standby>

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

SDSD

Water
storage
tank

KK

1F

Water
storagetank

Shallow
draft quay

Outline・After the explosion, all workers evacuated to the seismic isolated building.
・The hose prepared for seawater injection was damaged and not usable due to the impact of explosion.

Sea(6) Start of seawater injection to Unit 1(Mar 12 19:04)<Breakdown/status not confirmed>
1F

1F

1F/2F
Water
storage
tank

#4

Water
storage
tank

#3
Water
storage
tank

#2

#1

R/B

R/B

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit<Standby>
KKSDSD

Water
storage
tank

1F

Water
storagetankShallow
draft quay

Outline・A water injection line was installed by connecting 3 fire engines in series and using the Unit 3 reverse cleaning
valve pit as water source, to start seawater injection to Unit 1 at 19:04.

Sea(7) Start of freshwater injection to Unit 3(Mar 13 9:25)<Breakdown/status not confirmed>
1F

1F/2F

KK
Water
storage
tank

#4

Water
storage
tank

#3
Water
storage
tank

#2

#1

R/B

R/B

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit<Standby>
KKSDSD
1FWaterstorage
tankWaterstoragetank

1FShallow
draft quay

Outline・Collected the fire engine on the Unit 5/6 side around 6:00. 1 KK standby fire engine at 2F arrived at 1F around 6:30.
・As for Unit 1, a seawater injection line was installed using seawater of the Unit 3 reverse cleaning valve pit as water
source, which was later changed to freshwater injection line using water storage tanks as water source, to startwater injection at 9:25.

Sea

(8) Start of seawater injection to Unit 3(Mar 13 13:12)

Waterstoragetank

#4

Water
storage
tank

#3
Water
storagetank<Breakdown/status not confirmed>
1F

#2

#1

R/B

R/B

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

1F<Standby>
KK

KKSDSD

Water
storage
tank

1F/2F

1F

Water
storagetankOutline・The line was changed to using the Unit 3 reverse cleaning valve pit as water source, to start seawater injection
to Unit 3 at 13:12.

Shallow
draft quaySea(9) Preparation of seawater injection to Unit 2(Mar 13 evening)

Water
storage
tank

#4

Water
storage
tank

#3
Water
storagetank<Breakdown/status not confirmed>
1F

#2

#1

R/B

R/B

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

1F

1F/2F

<Standby>
KKSDSD

1F

KK

Water
storagetank

Water
storagetankOutline・The lineup was formed to prepare for seawater injection to Unit 2.

Shallow
draft quaySea

(10) Stop of fire engines / restart of water injection to Unit 3(Mar 14 1:10/3:20)

Water
storage
tank

#4

Water
storage
tank

#3
Water
storage
tank

#2

#1

R/B

R/B

R/B

R/B

T/B

T/B

T/B

T/B

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit<Breakdown/status not confirmed>
1F

1F/2F

<Standby>
KK

SD

1FSD

1F

KK

Water
storagetank

Water
storagetankOutline・At 1:10, water injection was stopped due to seawater shortage in the Unit 3 reverse cleaning valve pit.
・At 3:20, seawater became available by adjusting the pumping location of the hose, and water injection to Unit 3
was restarted.

Shallow
draft quaySea(11) Completion of water supply line from the shallow draft quay
(Mar 14 9:05)

Waterstoragetank#4

Waterstorage
tank

#3

R/B

R/B

T/B

T/B

Water
storage
tank

#2

#1

R/B

R/B

T/B

<Breakdown/status not confirmed>
1F

1F/2F

<Standby>PF

KK

PF Sodegaura Thermal

T/B

Anegasaki Thermal

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

SD

1FKK

Water
storagetankSD

Waterstoragetank1F

Minami Yokohama
ThermalChiba Thermal

Shallow
draft quayOutline
・On Mar 14, 2 fire engines from public fire stations arrived early morning, and at 5:03, 4 fire engines arrived
from TEPCO’s thermal power plants.
・Water supply line from the shallow draft quay was formed, and the fire engines were started at 9:05. Seawater
was continuously supplied to the reverse cleaning valve pit.

Sea(12) Hydrogen explosion at Unit 3(Mar 14 11:01)

Water
storage
tank

#4

Water
storagetank<Breakdown/status not confirmed>
1F

#3

R/B

R/B

T/B

T/BWaterstorage
tank

#2

#1

R/B

R/B

T/B

1F/2F

<Standby>
PFKK

PF Sodegaura Thermal

T/B

Anegasaki Thermal

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

Reversecleaning valve pit

SD1FSD

1F

KK

Water
storagetank

Water
storagetankMinami Yokohama
ThermalChiba Thermal

Shallow
draft quay

Outline・After the explosion, all workers evacuated to the seismic isolated building.
・The fire engines around the site were broken down due to the impact of explosion, and water
injection was stopped.

Sea(13) Restart of water injection to Unit 3 / start of seawater injection to Unit 2(Mar 14 around 15:30/19:54)

Water
storage
tank

#4

Water
storagetank<Breakdown/status not confirmed>
1F

1F/2F

1FKKSD

#3

R/B

R/B

T/B

T/B

Water
storagetank

#2

#1

R/B

R/B

T/B

<Standby>PF

KK

PF Sodegaura Thermal

T/BAnegasaki Thermal

Reversecleaning valve pit

Reversecleaning valve pit

Waterstoragetank

Reversecleaning valve pit

Reversecleaning valve pit

WaterstoragetankMinami YokohamaThermal

1FSD

Chiba ThermalShallow
draft quay

Outline・A seawater injection line was installed from shallow draft quay to Units 2 and 3, and the fire engines werestarted around 15:30. Water injection to Unit 3 was restarted, and prepare Unit 2 to the status being injectedwith water after pressure decrease of the reactor. Seawater injection was started at 19:54.

Sea

<Breakdown/status not confirmed>(14) Restart of water injection to Unit 1(Mar 14 around 20:00)

Water
storage
tank

#4

Water
storage
tank

1F

1F/2F

1F

KKSD

#3

R/B

R/B

T/B

T/B

Water
storage
tank

#2

#1

R/BR/B

T/B<Standby>
PFKKPF

T/B

Anegasaki Thermal

SD1F

Reversecleaning valve pit

Reversecleaning valve pit

Waterstoragetank

Reversecleaning valve pit

Reversecleaning valve pit

WaterstoragetankOutline・Around 20:00, restart of water injection to Unit 1 was confirmed.

Minami Yokohama
ThermalChiba
ThermalShallow draft
Sodegaura
quay
ThermalSea

Additional Information

Unit 5/6

1F

1F
Fire engine house

Water
storage
tank

#4

Water
storage
tank

#3

R/B

R/B

T/B

T/B

Water supply inlet
Reversecleaning valve pit

No seawater?

Impassable due toroad damage anddebris carried bytsunami

Water supply inlet
Reversecleaning valve pit

Seawater exist#2Waterstorage
tank

#1

R/B

Impassable because thetanks carried by tsunami
blocked the way

R/B

T/B

Elevation
OP.10000

T/B

Water supply inlet

Water supply inlet

Reversecleaning valve pit

Reversecleaning valve pit

No seawater

No seawater

Elevation
OP.5000
1F

Breakdown due to tsunami
Water
storagetank

Water
storagetank

Shallow
draft quaySea[Fire Engine Class]
1F（Fukushima Daiichi Nuclear Power Plant） : A2 ClassSD（Self-Defense Forces） : A2 Class
KK（Kashiwazaki Kariwa Nuclear Power Plant） : A2 Class
Minami Yokohama Thermal Power Plant : A1 Class
Chiba Thermal Power Plant : A1 Class
Sodegaura Thermal Power Plant : A1 Class[A1 Class Design Specification ]Specified dischargepressure

Specified discharge rate

Normal discharge

0.85 MPa

2.8 m3/min

High pressure discharge

1.4 MPa

2.0 m3/min

Specified dischargepressure

Specified discharge rate

Normal discharge

0.85 MPa

2.0 m3/min

High pressure discharge

1.4 MPa

1.4 m3/min[A2 Class Design Specification ]Vertical SectionFukushima Nuclear Accident Analysis Report (Interim Report)
which was released on Dec. 2, 2011