Investor Presentaiton
WHAT HAPPENED
Description of the events presented in
chronological order to highlight the
integrated response to a multi-unit
accident
N
0
200 km
11 Mar
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
12 Mar
00:00
Higashidori NPP
01:00
02:00
03:00
04:00
05:00
Epicentre
Onagawa NPP
06:00
07:00
Fukushima Daiichi NPP
Fukushima Daini NPP
Tokai Daini NPP
Tokyo
08:00
09:00
10:00
Japan Trench
11:00
12:00
JAPAN
Osaka
13:00
14:00
15:00
Confinement
Control of
reactivity
Core heat
removal
AC power
Critical support Spent fuel
systems* pool cooling 15:36 Second tsunami wave starts
123456 12 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 flooding site (estimated inundation
height OP+14.5 m)
O cooling
15:42 Station blackout declared for
Units 1-5
16:36 Presumed severe accident
conditions in Units 1 and 2,
- classification of a nuclear
Bemergency
19:03 Declaration of a nuclear
emergency by the national
Government
(16:03) RCIC
à condensate storage tank
20:50 Fukushima Prefecture issues
an evacuation order for an area of
2 km radius around the NPP
21:23 National Government issues
an evacuation order for an area of
3 km radius and a sheltering order
for a 10 km radius around the NPP
23:50 Unit 1 primary containment
vessel exceeds maximum design
pressure
01:40 Safety relief valve opens in
- Unit 5
02:45 Unit 1 reaches maximum
containment pressure
04:00 Increased radiation levels at
main gate, start of alternate water
injection into Unit 1 (first batch)
04:55 Confirmation and notification
that dose rate at main gate
increased
cooling or make-up
or make-up
O cooling or make-up
No cooling or make-up,
(15:50)
No indication for water level and temperature
Not applicable
11:36 Loss of reactor core isolation
cooling system (RCIC) in Unit 3 and
automatic switch to emergency
cooling
12:35 Automatic actuation of
emergency cooling in Unit 3 to high
pressure core injection system (HPCI)
14:00 Operators open venting line
of Unit 1 and receive confirmation
of venting at 14:30
15:30 Establishment of temporary
seawater injection line to Unit 1 and
power lines to Units 1 and 2 with
high voltage power supply trucks
15:36 Explosion in Unit 1: destruction
of water and power provisions,
degrading site radiological conditions
* Includes DC power and instrument air
1-6 Fukushima Daiichi NPP units
(15:50) Loss of DC power through flooding (21:19) Portable batteries
(15:50) Loss of DC power through flooding (20:47) Portable generator
(15:50) Loss of DC power through flooding (21:27) Portable batteries
(15:36) Two emergency diesel generators (EDGS) trip, one remains operational▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
No cooling or make-up, (15:50) No indication for water level and temperature
No cooling or make-up, (15:50) No indication for water level and temperature▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
(15:37) Emergen
(15:41) Emergency diesel generators trip causing a station blackout
in) Primary containmen secondary containment (reactor building)
m(15:38) Emergency diesel generators trip causing a station blackout
(15:38) Emergency diesel generators trip causing a station blackout
(15:40) Emergency diesel generators trip causing a station blackout
t vessel cover open, only secondary containment
esel generators trip causing a station blackout▬▬▬▬▬
((08:13) Connection to Unit 6 EDG (for certain equipment)
damages some equipment in support of low pressure core cooling
Primary containment vessel exceeds maximum design pressure▬▬▬▬▬▬▬▬Venting
cooling sytem (RCIC) from condensate storage tank
(06:06) Head vent nozzle is opened
5:00) RCIC from suppression chamber
HPCI
16:00
Izu-Bonin Trench
Source: Esri, NASA
Available
Onerating
Limited or partially available/operating
Not available
Alternative measure
05:44 National Government issues
an evacuation order for an area of
10 km radius around the NPP
09:20 Continuous fresh water
(FW) injection by fire engine into
Unit 1View entire presentation