From: Wegner, Mary
Sent: Wednesday, March 1.6, 2011 10:29 AM
To: Gonzalez, Felix; Hill, Kendra;:Hyslop, JS; Melly, Nicholas; Salley, MarkHenry; Stroup, David;
Subject: Japan Info
This is the latest from Japan. I can get all the earlier info if you would like it – From NISA, the regulator and TEPCO, the licensee. I also have information from the Japanes press which I call tentative. I do not poll the US press as what I have seen is inaccurate, to be kind. Would you like to continue receiving this? Would you like the older info.
JAPAN – TEPCO Plant Status, 03/16/11
1. Nuclear Power Stations (NPS)
o Fukushima Dai-ichi NPS
TEPCO evaluated that core damage of Unit 2 is “less than 5%” (22:14 March 14th)
* Water level in RPV in Unit 2 was decreasing. (22:50 March 14th)
There was a sound of explosion in Unit 2. As the pressure in Suppression Chamber decreased, there was possibility that an incident occurred in this Chamber. (06:20 March 15th)
– The fire at Unit 4 occurred. Fire extinguishing work was underway. (09:38 March 15th)
o Fukushima Dai-ni NPS
– Continue to remove the residual heat by Residual Heat Removal System (RHR) in Unit 1,2,3 and 4 (02:00 March 15th)
– Cold shut down of Unit 4 was confirmed (07:15 March 15th)
o Onagawa NPS
– Readings of monitoring post indicats 6.1 micro Sv/h. (07:00 March 15th)
– Cold shut down was confirmed. (00:40 March 15th)
Impact to TEPCO’s Facilities due to Tohoku-Taiheiyou-Oki Earthquake
(as of 2:00PM)
Below is the status of TEPCO’s major facilities that suffered from the Tohoku-Taiheiyou-Oki Earthquake that occurred at 2:46PM, March 11 th 2011.
*new items are underlined
[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station:
Units 1 to 3: shutdown due to earthquake
Units 4 to 6: outage due to regular inspection at the occurrence of earthquake
*The national government has instructed to evacuate for those local residents within 20km radius of the site periphery and to remain indoors for those local residents within 30km radius of the site periphery.
*Since the value of radioactive materials (iodine, etc) at the site (outside) measured by monitoring car exceeded the ordinary level, it was determined that a specific incident stipulated in article 15, clause 1 occurred (Extraordinary increase of radiation dose at site
– 4:17 pm, March 15th at the main gate of the site
– 11:05 pm, March 15th at the main gate of the site
* Unit 1
The explosive sound and white smoke was confirmed near Unit 1 after the big quake occurred at 3:36pm, March 12th. We have started sea water injection at 8:20 pm and then boric acid into the reactor.
At 1:25 pm, March 14th, since the Reactor Core Isolation Cooling System has failed, it was determined that a specific incident stipulated in article 15, clause 1 occurred (failure of reactor cooling function).
At 5:17 pm, while the water level in the reactor reached the top of the fuel rod, we have restarted the water injection with the valve operation.
Approximately 6:14 am, March 15th, the extraordinary sound was confirmed near the suppression chamber and the pressure inside the chamber decreased afterwards. It was determined that there is a possibility that something extraordinary happened in the suppression chamber. While sea water injection to the reactor continued, TEPCO employees and workers from other companies not in charge of injection work started tentative evacuation to a safe location.
Sea water injection to the reactor is still under operation.
At 6:50 am, March 14th, while water injection to the reactor was under operation, the pressure in the reactor containment vessel increased to 530 kPa. As a result, at 7:44 am, it was determined that a specific incident stipulated in article 15, clause 1 occurred (abnormal increase of the pressure of reactor containment vessel). Afterwards, the pressure has gradually decreased (as of 9:05 am, 450 kPa).
Approximately 11:01 am, March 14th, an explosion followed by white smoke occurred near Unit 3. 4 TEPCO employees and 3 workers from other companies (all of them are conscious) have sustained injuries and they were already dispatched to the hospital by ambulances.
Approximately 6:00 am, March 15th, an explosive sound occurred and the damage in the 5th floor roof of Unit 4 reactor building was confirmed. At 9:38 am, the fire near the north-west part of 4th floor of Unit 4 reactor building was confirmed. At approximately 11:00 am, TEPCO employee confirmed that the fire was off. Approximately 5:45 am, a TEPCO employee discovered a fire at the northwest corner of the Nuclear Reactor Building. TEPCO immediately
reported this incident to the fire department and the local government and prepared to extinguish the fire. However, during an inspection approximately 6:15 am, TEPCO staff found no signs of fire.
Fukushima Daini Nuclear Power Station:
Units 1 to 4: shutdown due to earthquake
*The national government has instructed evacuation for those local residents within 10km radius of the periphery.
*As the radiation dose at the site boundary exceeded the limitation, it was determined that a specific incident stipulated in article 15, clause 1 occurred (Extraordinary increase of radiation dose at site
*Reactor cooling function was restored and cooling of reactors was conducted. As a result, all reactors achieved cold shutdown: Unit 1 at 5:00 pm, March 14th, Unit 2 at 6:00 pm, March 14th, Unit 3 at 0:15 pm, March 12th, Unit 4 at 7:15 am, March 15th.
* (Unit 1)
As it is confirmed that the temperature of the Emergency Equipment Cooling Water System *1 has increased, at 3:20 pm, March 15th, we stopped the Residual Heat Removal System (B) for the inspection. Subsequently, failure was detected in the power supply facility associated with the pumps of the Emergency Equipment Cooling Water System. At 4:25 pm, March 15th, after replacing the power facility, the pumps and the Residual Heat Removal System (B) have been
* (Unit 4)
As it is confirmed that the pressure at the outlet of the pumps of the Emergency Equipment Cooling Water System*1 has been decreased, at 8:05 pm, March 15th, we stopped the Residual Heat Removal System
(B) for the inspection. Subsequently, failure was detected in the power supply facility associated with the pumps of the Emergency Equipment Cooling Water System. At 9:25 pm, March 15th, after replacing the relevant facility, the pumps and the Residual Heat Removal System (B) have been reactivated.
*1 :emergency water system in which cooling water (pure water) circulates which exchanged the heat with sea water in order to cool down bearing pumps and/or heat exchangers etc.
Kashiwazaki Kariwa Nuclear Power Station:
Units 1, 5, 6, 7: normal operation
Units 2 to 4: outage due to regular inspection
Considering the critical balance of our power supply capacity and expected power demand forward, in order to avoid unexpected blackout, TEPCO has implemented rolling blackout (planned blackout alternates from one area to another) since yesterday. We will make our utmost to secure the stable power supply as early as possible.
- March 18th, 2011 – Nuclear Events Web-based System (NEWS) – Fukushima Daini Unit 1 – Unit 2 – Unit 4 – Loss of the cooling function to the ultimate heat sink due to the big tsunami (enformable.com)
- March 18th, 2011 – Tohoku-Taiheiyou-Oki Earthquake Effects On Japanese Nuclear Power Plants (enformable.com)
- Submission of reports to NISA regarding results of earthquake response analysis using observed seismic data collected at Fukushima Daiichi and Daini Nuclear Power Station (enformable.com)
- Post-Fukushima, Japanese Official sees crisis as war between humans and technology (enformable.com)
- March 15th, 2011 – Fukushima Daiichi Timelines from TEPCO and NISA press releases (enformable.com)
- March 14th, 2011 – Looks like RCIC at Fukushima Daiichi Unit 2 has failed. (enformable.com)