<Legend>
00 : Fire engine of O O 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) Water storage tankのWater supply inlet Reverse cleaning valve pit No seawater Water supply inlet Reverse cleaning valve pit Seawater exist Fire engine house debris carried by tsunami Impassable because the tanks carried by tsunami blocked the way 1F Breakdown due to tsunami
Outline
Water storage Water storage tank Shallow draft quay tank • 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 was interrupted due to road damage and debris carried by tsunami, and there was information that the fire engine was swept up by tsunami. Sea (2) Start of freshwater injection to Unit 1 (Mar 12 around 4:00) Water storage tank @ Reverse cleaning valve pit Water storage tank Water storage tank
Outline
<Breakdown/status not confirmed> Shallow draft quay • 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 the seismic isolated building by fire engine due to increased radiation dose. Sea (3) Restart of freshwater injection to Unit 1 (Mar 12 around 5:46) Water storage tank @ cleaning valve pit Water storage tank Water storage tank報告<Breakdown/status not confirmed> Shallow draft quay Outline • Self-Defense Forces and partner companies went to the site by fire engine and restarted the water injection at 5:46. Sea - 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 supplied from water 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 because of its old model.) Water storage tank Water storage tank 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 cleaning valve pit Water storage tank Water storage tank Shallow draft quay Outline Sea • 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. (7) Start of freshwater injection to Unit 3 • 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 start water injection at 9:25. Sea (8) Start of seawater injection to Unit 3 (Mar 13 13:12) <Breakdown/status not confirmed> Water storage tank Water storage tank Shallow draft quay Outline Sea • 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. Water storage tank Water storage tank Shallow draft quay Outline •The lineup was formed to prepare for seawater injection to Unit 2. Sea (10) Stop of fire engines / restart of water injection to Unit 3 (Mar 14 1:10/3:20) <Breakdown/status not confirmed> Water storage tank Water storage tank Shallow draft quay Outline Sea • 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. (11) Completion of water supply line from the shallow draft quay (Mar 14 9:05) Water storage tank Outline Water storage tank Minami Yokohama Thermal Chiba Thermal Shallow draft quay • 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 <Breakdown/status not confirmed> (12) Hydrogen explosion at Unit 3 (Mar 14 11:01) <Breakdown/status not confirmed> Water storage tank Water storage tank Minami Yokohama Thermal Chiba 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 Water storage tank T/BのReverse cleaning valve pit Water storage tank Water storage tank Minami Yokohama Thermal Chiba Thermal Shallow draft quay Outline • A seawater injection line was installed from shallow draft quay to Units 2 and 3, and the fire engines were started around 15:30. Water injection to Unit 3 was restarted, and prepare Unit 2 to the status being injected with water after pressure decrease of the reactor. Seawater injection was started at 19:54. Sea cleaning valve pit Water storage tank Water storage tank Minami Yokohama Thermal Chiba Thermal Shallow draft quay Thermal reserve Outline Sea • Around 20:00, restart of water injection to Unit 1 was confirmed. Sodegaura Additional Information Sea
[Fire Engine Class]
1F (Fukushima Daiichi Nuclear Power Plant) : A2 Class SD(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
Fukushima Nuclear Accident Analysis Report (Interim Report) which was released on Dec. 2, 2011