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March 18, 2011
Nuclear and Industrial Safety Agency
Seismic Damage Information (the 28th Release)
(As of 17:30 March 17th, 2011)
Nuclear and Industrial Safety Agency (NISA) confirmed the current
situation of Onagawa NPS, Tohoku Electric Power Co. Inc.; Fukushima
Dai-ichi and Fukushima Dai-ni NPSs, Tokyo Electric Power Co. Inc.
(TEPCO); Tokai Dai-ni NPS, Japan Atomic Power Co. Inc. as follows:
Major updates are as follows.
1. Nuclear Power Stations (NPS)
Fukushima Dai-ichi NPS
・ 4 times of seawater discharge to Unit 3 by the helicopters of
Self-Defence Force (9:48, 9:52, 9:58, 10:01 March 17th)
・ Arrival of the riot police at the site for grand discharge (16:10 March
17th)
・ Cable installation to receive electricity from the transmission line of
Tohoku Electric Power Company. Schedule to be connected to Unit 2
after the completion of discharge work. (17:30 March 17th)
・ Emergency Diesel Generator (1 unit) for Unit 6 operable. Supplying
electricity to Unit 5 and 6. Water injection to Spent Fuel Pool through
the Make up Water Condensate System (MUWC) progressing. Schedule
to inject water to the Reactor Pressure Vessel (RPV) after the recovery of
external power source.
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1. The status of operation at NPS (Number of automatic shutdown units: 10)
Fukushima Dai-ichi NPS, TEPCO
(Okuma Town and FutabaTown, Futaba County, Fukushima Prefecture)
(1) The status of operation
Unit 1 (460MWe): automatic shutdown
Unit 2 (784MWe): automatic shutdown
Unit 3 (784MWe): automatic shutdown
Unit 4 (784MWe): in periodic inspection outage
Unit 5 (784MWe): in periodic inspection outage
Unit 6 (1,100MWe): in periodic inspection outage
(2) Major Plant Parameters (12:00 March 17th)
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6
Reactor
Pressure
[MPag]
0.173 (A)
0.144(B)
-0.029(A)
-0.047(B)
0.014 (A)
0.023(A)
- 1.100 0.740
CV Pressure
(D/W) [kPa]
Not
available
115 190 - - -
Reactor Water
Level*1 [Mm]
-1,800(A)
-1,800(B)
-1,800(A)
Not
available(B)
-1,950(A)
-2,300(B)
- 1,870 1,309
Suppression
Pool Water
Temperature
(S/C) [℃]
- - - - - -
Suppression
Pool Pressure
(S/O) [kPa]
Not
available
down scale down scale - - -
Spent Fuel
Pool Water
Temperature
[℃]
- - - 84 64.2 62.5
Time of
Measurement
11:30
March
17th
11:30
March
17th
11:10
March
17th
04:08
March
14th
12:00
March
17th
12:00
March
17th
*1: Distance from the top of fuel
(3) Report concerning other incidents
・ TEPCO reported to NISA the event in accordance with the Article 10 of
the Act on Special Measures Concerning Nuclear Emergency
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Preparedness regarding Fukushima Dai-ichi. (15:42 March 11th)
・ TEPCO reported to NISA the event (Loss of reactor cooling function)
falling under the Article 15 of the Act on Special Measures Concerning
Nuclear Emergency Preparedness regarding Units 1 and 2 of
Fukushima Dai-ichi. (16:36 March 11th)
・ The cable for receiving electricity from the transmission line of Tohoku
Electric Power Company was installed. It is scheduled to be connected
to Unit 2 after the completion of discharge work. (17:30 March 17th)
・ Seawater was injected to RPV via the Fire Extinguishing System Line
(Started up 11:55 March 13th)
→Temporary interruption of the injection (01:10 March 14th)
・ The sound of explosion in Unit 1 occurred. (15:36 March 12nd)
・ Seawater is being injected as of 17:30 March 17th.
・ Water injection function was sustained. (14:00 March 13th)
・ Reactor water level was decreasing. (13:18 March 14th) TEPCO
reported to NISA the event (Loss of reactor cooling functions) falling
under the Article 15 of the Act on Special Measures Concerning Nuclear
Emergency Preparedness. (13:49 March 14th)
・ Seawater injection to RPV was ready through the Fire Extinguishing
System line. (19:20 March 14th)
・ TEPCO evaluated core damage of Unit 2 was “less than 5%” (22:14
March 14th)
・ Water level in RPV in Unit 2 is decreasing. (22:50 March 14th)
・ A sound of explosion was made in Unit 2. As the pressure in
Suppression Chamber decreased (06:10 March 15th), there was a
possibility that an incident occurred in the Chamber. (06:20 March
15th)
・ Seawater is being injected as of 17:30 March 17th.
・ Fresh water was injected to RPV via the Fire Extinguishing System
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Line (FESL). (11:55 March 13th)
・ Seawater was injected to RPV via FESL. (13:12 March 13th)
・ Injection of seawater for Unit 1 and Unit 3 to the Primary Containment
Vessel (PCV) was interrupted due to the lack of seawater in pit. (01:10
March 14th)
・ For Unit 3 injection of seawater into PCV was restarted (03:20 March
14th)
・ The pressure in PCV of Unit 3 rose unusually. (7:44 March 14th)
TEPCO reported to NISA the event (Loss of reactor cooling function)
falling under the Article 15 of the Act on Special Measures Concerning
Nuclear Emergency Preparedness. (7:52 March 14th)
・ For Unit 3 the explosion like Unit 1 occurred around the Reactor
Building (11:01 March 14th)
・ The white smoke like steam generated from Unit 3. (08:30 March 16th)
・ Because of the possibility that PCV of Unit 3 was damaged, the workers
evacuated from the central control room of Unit 3 and 4 (common
control room). (10:45 March 16th) Thereafter the operators returned to
the room and restarted the operation for water injection. (11:30 March
16th)
・ Seawater was discharged 4 times to Unit 3 by the helicopters of
Self-Defence Force. (9:48, 9:52, 9:58 and 10:01 March 17th)
・ The riot police arrived at the site for grand discharge. (16:10 March
17th)
・ Seawater is being injected to RPV as of 17:30 March 17th.
・ It was confirmed that a part of wall in the operation area of Unit 4 was
damaged. (06:14 March 15th)
・ The fire at Unit 4 occurred. (09:38 March 15th) TEPCO reported that
the fire was extinguished spontaneously. (11:00 March 15th)
・ The temperature of water in the Spent Fuel Storage Pool at Unit 4 had
increased. (84 ℃ at 04:08 March 14th)
・ The fire occurred at Unit 4. (5:45 March 15th) TEPCO reported that no
fire could be confirmed on the ground.(06:15 March 16th)
・ The water injection is suspended as of 17:30 March 17th.
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・ Emergency Diesel Generator (1 unit) for Unit 6 is operable and
supplying electricity to Units 5 and 6. Water injection to the Spent Fuel
Pool through MUWC is progressing. It is scheduled to inject water to
RPV after the recovery of external power source.
Fukushima Dai-ni NPS (TEPCO)
(Naraha Town / Tomioka Town, Futaba County, Fukushima Prefecture.)
(1) The status of operation
Unit1 (1,100MWe): automatic shutdown, cold shut down at 17:00,
March 14th
Unit2 (1,100MWe): automatic shutdown, cold shut down at 18:00,
March 14th
Unit3 (1,100MWe): automatic shutdown, cold shut down at 12:15,
March 12th
Unit4 (1,100MWe): automatic shutdown, cold shut down at 07:15,
March 15th
(2) Major plant parameters (As of 17:00, 17 March)
unit Unit 1 Unit 2 Unit 3 Unit 4
Reactor Pressure MPag 0.09 0.04 0.04 0.06
Reactor water
temperature
℃ 44.5 43.0 26.8 40.6
Reactor water
level*
mm 10,796 11,246 7,516 8,893
Suppression pool
water temperature
℃ 34 28 43 39
Suppression pool
pressure
kPa 132 121 136 134
Remarks
cold
shutdown
cold
shutdown
cold
shutdown
cold
shutdown
*: Distance from the top of fuel
(3) Report concerning other incidents
・ TEPCO reported to NISA the event in accordance with the Article 10 of
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the Act on Special Measures Concerning Nuclear Emergency
Preparedness regarding Unit 1 of Fukushima Dai-ni NPS. (18:08 March
11th)
・ TEPCO reported to NISA the events in accordance with the Article 10
regarding Units 1, 2 and 4 of Fukushima Dai-ni NPS. (18:33 March
11th)
・ TEPCO reported to NISA the event (Loss of pressure suppression
function) falling under the Article 15 of the Act on Special Measures
Concerning Nuclear Emergency Preparedness regarding Unit 1 of
Fukushima Dai-ni NPS. (5:22 March 12th)
・ TEPCO reported to NISA the event (Loss of pressure suppression
function) falling under the Article 15 of the Act on Special Measures
Concerning Nuclear Emergency Preparedness regarding Unit 2 of
Fukushima Dai-ni NPS. (5:32 March 12th)
・ TEPCO reported to NISA the event (Loss of pressure suppression
function) falling under the Article 15 of the Act on Special Measures
Concerning Nuclear Emergency Preparedness regarding Unit 4 of
Fukushima Dai-ni NPS. (6:07 March 12th)
Onagawa NPS (Tohoku Electric Power Co. Inc.)
(Onagawa Town, Oga County and Ishinomaki City, Miyagi Prefecture)
(1) The status of operation
Unit 1 (524MWe): automatic shutdown, cold shut down at 0:58, March
12th
Unit 2 (825MWe): automatic shutdown, cold shut down at earthquake
Unit 3 (825MWe): automatic shutdown, cold shut down at 1:17, March
12th
(2) Readings of monitoring post
Reading of monitoring post:
MP2 (Monitoring at the North End of Site Boundary)
approx. 6,500 nGy/h (19:00 March 14th)
→approx. 5,400 nGy/h (19:00 March 15th)
(3) Report concerning other incidents
・ Fire Smoke on the first basement of the Turbine Building was confirmed
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to be extinguished. (22:55 on March 11th)
・ Tohoku Electric Power Co. reported to NISA in accordance with the
Article 10 of the Act on Special Measures Concerning Nuclear
Emergency Preparedness. (13:09 March 13th)
2. Action taken by NISA
(March 11th)
14:46 Set up of the NISA Emergency Preparedness Headquarters (Tokyo)
immediately after the earthquake
15:42 TEPCO reported to NISA in accordance with the Article 10 of the Act
on Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
16:36 TEPCO recognized the event (Loss of cooling function) in accordance
with the Article 15 of the Act on Special Measures Concerning
Nuclear Emergency Preparedness regarding Units 1 and 2 of
Fukushima Dai-ichi NPS. (Reported to NISA at 16:45)
18:08 Regarding Unit 1 of Fukushima Dai-ni NPS, TEPCO reported to
NISA in accordance with the Article 10 of the Act on Special
Measures Concerning Nuclear Emergency Preparedness.
18:33 Regarding Units 1, 2 and 4 of Fukushima Dai-ni NPS, TEPCO
reported to NISA in accordance with the Article 10 of Act on Special
Measures Concerning Nuclear Emergency Preparedness.
19:03 Government declared the state of nuclear emergency. (Establishment
of Government Nuclear Emergency Response Headquarters and
Local Emergency Response Headquarters)
20:50 Fukushima Prefecture’s Emergency Response Headquarters issued a
direction for the residents within 2 km radius from Unit 1 of
Fukushima Dai-ichi NPS to evacuate. (The population of this area is
1,864.)
21:23 Directives from Prime Minister to the Governor of Fukushima
Prefecture, the Mayor of Okuma Town and the Mayor of Futaba
Town were issued regarding the event occurred at Fukushima
Dai-ichi NPS, TEPCO, in accordance with the Paragraph 3, the
Article 15 of the Act on Special Measures Concerning Nuclear
Emergency Preparedness as follows:
- Direction for the residents within 3km radius from Unit 1 to
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evacuate
- Direction for the residents within 10km radius from Unit 1 to stay
in-house
24:00 Vice Minister of Economy, Trade and Industry, Ikeda arrived at the
Local Emergency Response Headquarters
(March12th)
05:22 Regarding Unit 1 of Fukushima Dai-ni NPS, TEPCO recognized the
event (Loss of pressure suppression function) to fall under the Article
15 of the Act on Special Measures Concerning Nuclear Emergency
Preparedness. (reported to NISA at 06:27)
05:32 Regarding Unit 2 of Fukushima Dai-ni NPS, TEPCO recognized the
event (Loss of pressure suppression function) to fall under the Article
15 of the Act on Special Measures Concerning Nuclear Emergency
Preparedness.
05:44 Residents within 10km radius from Unit 1 of Fukushima Dai-ichi
NPS shall evacuate by the Prime Minister Direction.
06:07 Regarding of Unit 4 of Fukushima Dai-ni NPS, TEPCO recognized the
event (Loss of pressure suppression function) to fall under the Article
15 of the Act on Special Measures Concerning Nuclear Emergency
Preparedness.
06:50 In accordance with the Paragraph 3, the Article 64 of the Nuclear
Regulation Act, the order was issued to control the internal pressure
of the Containment Vessel of Units 1 and 2 of Fukushima Dai-ichi
NPS.
07:45 Directives from Prime Minister to the Governor of Fukushima
Prefecture, the Mayors of Hirono Town, Naraha Town , Tomioka
Town and Okuma Town were issued regarding the event occurred at
Fukushima Dai-ni NPS, TEPCO, pursuant to the Paragraph 3, the
Article 15 of the Act on Special Measures Concerning Nuclear
Emergency Preparedness as follows:
- Direction for the residents within 3km radius from Fukushima
Dai-ni NPS to evacuate
- Direction for the residents within 10km radius from Fukushima
Dai-ni NPS to stay in-house
17:00 TEPCO reported to NISA the event (Unusual increase of radiation
9
dose at the site boundary) falling under the Article 15 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
17:39 Prime Minister directed evacuation of the residents within the 10 km
radius from Fukushima-Dai-ni NPS
18:25 Prime Minister directed evacuation of the residents within the 20km
radius from Fukushima Dai-ichi NPS
19:55 Directives from Prime Minister was issued regarding seawater
injection to Unit No.1 of Fukushima Dai-ichi NPS.
20:05 Considering the Directives from Prime Minister and pursuant to the
Paragraph 3, the Article 64 of the Nuclear Regulation Act, order was
issued to inject seawater to Unit 1 of Fukushima Dai-ichi NPS.
20:20 At Unit 1 of Fukushima Dai-ichi NPS, seawater injection started.
(March 13th)
05:38 TEPCO reported to NISA the event (Total loss of coolant injection
function) falling under the Article 15 of the Act on Special Measures
Concerning Nuclear Emergency Preparedness regarding Unit 3 of
Fukushima Dai-ichi NPS. Recovering efforts by TEPCO of the power
source and coolant injection function and work on venting are under
way.
09:01 TEPCO reported to NISA the event (Unusual increase of radiation
dose at the site boundary) falling under the Article 15 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
09:08 Pressure suppression in the Containment Vessel and fresh water
injection started at Unit 3 of Fukushima Dai-ichi NPS.
09:20 The Pressure Vent Valve of Unit 3 of Fukushima Dai-ichi NPS was
opened.
09:30 The order was issued for the Governor of Fukushima Prefecture, the
Mayors of Okuma Town, Futaba Town, Tomioka Town and Namie
Town in accordance with the Act on Special Measures Concerning
Nuclear Emergency Preparedness on the contents of radioactivity
decontamination screening.
09:38 TEPCO reported to NISA that Unit 1 of Fukushima Dai-ichi NPS
reached a situation specified in the Article 15 of the Act on Special
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Measures Concerning Nuclear Emergency Preparedness.
13:09 Tohoku Electric Power Co. reported to NISA that Onagawa NPS
reached a situation specified in the Article 10 of the Act on Special
Measures Concerning Nuclear Emergency Preparedness.
13:12 Fresh water injection was switched to seawater injection at Unit 3 of
Fukushima Dai-ichi NPS.
14:36 TEPCO reported to NISA the event (Unusual increase of radiation
dose at the site boundary) falling under the Article 15 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
(March 14th)
01:10 Seawater injection at Unit 1 and Unit 3 of Fukushima Dai-ichi NPS
were temporarily interrupted due to the lack of seawater in pit.
03:20 Seawater injection at Unit 3 of Fukushima Dai-ichi NPS was
restarted.
04:40 TEPCO reported to NISA the event (Unusual increase of radiation
dose at the site boundary) falling under the Article 15 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
05:38 TEPCO reported to NISA the event (Unusual increase of radiation
dose at the site boundary) falling under the Article 15 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
07:52 TEPCO reported to NISA the event (Unusual rise of the pressure in
PCV) falling under the Article 15 of the Act on Special Measures
Concerning Nuclear Emergency Preparedness regarding Unit 3 of
Fukushima Dai-ichi NPS.
13:25 Regarding Unit 2 of Fukushima Dai-ichi NPS, TEPCO recognised the
event (Loss of cooling function) to fall under the Article 15 of the Act
on Special Measures Concerning Nuclear Emergency Preparedness.
22:13 TEPCO reported to NISA in accordance with the Article 10 of the Act
on Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ni NPS.
22:35 TEPCO reported to NISA the event (Unusual increase of radiation
dose at the site boundary) falling under the Article 15 of the Act on
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Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
(March 15th)
00:00: The acceptance of experts from IAEA was decided. NISA agreed to
accept the offer of dispatching of the expert on NPS damage from
IAEA considering the intention by Mr. Amano, Director General of
IAEA. Therefore, the schedule of expert acceptance will be planned
from now on according to the situation.
00:00: NISA also decided the acceptance of experts dispatched from NRC.
07:21 TEPCO reported to NISA the event (Unusual increase of radiation
dose at the site boundary) falling under the Article 15 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
07:24 Incorporated Administration Agency, Japan Atomic Energy Agency
(JAEA) reported to NISA in accordance with the Article 10 of the Act
on Special Measures Concerning Nuclear Emergency Preparedness
regarding, Nuclear Fuel Cycle Engineering Laboratories, Tokai
Research and Development Centre.
07:44 JAEA reported to NISA in accordance with the Article 10 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
regarding Nuclear Science Research Institute.
08:54 TEPCO reported to NISA the event (Unusual increase of radiation
dose at the site boundary) falling under the Article 15 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
regarding Fukushima Dai-ichi NPS.
10:30 According to the Nuclear Regulation Act, Minister of Economy, Trade
and Industry issued the directives as follows.
For Unit 4: To extinguish fire and to prevent the occurrence of
re-criticality
For Unit 2: To inject water to reactor vessel promptly and to vent
Drywell.
10:59 Considering the possibility of lingering situation, it is decided that the
function of the Local Emergency Response Headquarter is moved to
the Fukushima Prefectural Office.
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11:00 Prime Minister directed the in-house stay area.
In-house stay was additionally directed to the residents in the area
from 20 km to 30 km radius from Fukushima Dai-ichi NPS
considering in-reactor situation.
16:30 TEPCO reported to NISA the event (Unusual increase of radiation
dose at the site boundary) falling under the Article 15 of the Act on
Special Measures Concerning Nucl
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