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The Accident at TEPCO's Fukushima Dai-ichi Nuclear Power Station
Published on Mar 18, 20133758 Views
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The Accident at TEPCO’s Fukushima Dai-ichi Nuclear Power Station-Occurrence of the accident, Current situation and Future00:00
Contents00:21
Occurrence of the accident00:50
Earthquake and Tsunami01:01
Five nuclear power stations are located in the Tohoku District01:03
Fukushima Dai-ichi NPS and Fukushima Dai-ni NPS 01:42
Six BWR type nuclearpower plants02:09
Unit 1 ～5 at Fukushima Dai-ich NPS has flask-type primary containment vessel02:31
Before the earthquake and tsunami02:45
Epicenter of Tohoku District03:30
Huge tsunami attacked Minamisoma-shi04:26
Tsunami attacked the Fukushima Dai-ichi NPS04:40
Tsunami get over sea wall05:53
Entire facilities at Fukushima Daiichi NPS were flooded by tsunami06:14
Main sequence of the accident06:45
Earthquake and tsunami deprived the Fukushima Dai-ichi NPS of all AC power06:49
Loss of cooling capability - 108:00
Loss of cooling capability - 208:58
Core melt started around 17:00 march 11 at Unit 110:47
Core melt started around 18:00 march 14 at Unit 211:37
Core melt started around 08:00 march 13 at Unit 312:41
Melted fuels went down to the bottom of the reactor pressure vessel13:22
Accident management14:30
Unit 5 and Unit 616:07
Loss of power supply17:31
The earthquake caused shutdown of all the external power supply lines17:37
Yonomori Line18:28
Loss of external power supply18:45
One emergency generator in Unit 6 could survive19:40
Loss of cooling capability20:44
Cooling systems20:47
At Unit 1 from 05:46 March22:33
At Unit 2 RCIC23:33
At Unit 3 HPCI24:27
Water was injected into the reactors25:13
Cooling capability of spent fuel25:59
Water was injected into the spent fuel pool at Unit 427:24
Water level at unit 4 27:53
Hydrogen explosion29:01
Nuclear power plant is exposed to risk of hydrogen explosion29:04
In normal operation residual heat removal system piping was ruptured by hydrogen explosion29:30
Hydrogen explosion occurred at the upper part29:55
Hydrogen generated by zirconium-water reaction caused explosion31:09
Inflow of hydrogen from Unit 3 to Unit 431:43
Hydrogen explosion occurred at the upper part of reactor building32:10
Hydrogen explosion didn’t occurred due to opening of the blowout panel at Unit 232:34
Release of radioactivity33:01
Much quantity of radioactive materials33:05
Most of the radioactivity34:01
Amounts of radioactive materials34:37
Radioactive materials were released Intermittently35:13
Evacuation of the residential people35:45
Two stages of evacuation35:50
First stage35:51
Radioactive materials were accumulated37:20
New evacuation areas37:57
Two stages of evacuation areas38:45
Around 90,000 residents were required for evacuation39:34
Standards for radiation protection40:15
International criteria for the radiation protection40:19
20 mSv/year was introduced for accident continuation42:37
Deterioration and protraction of the accident42:58
Difficulties were caused by tsunami’s destruction of infrastructure43:03
Fuel oil tank swept away by the tsunami and blocking a road44:17
People engaged in the work44:46
Workers in the control room had to work in the darkness45:59
Settlement of the accident46:41
Damage at the reactor pressure vessel46:43
Circulating Injection system47:41
Two steps roadmap49:12
Impact on society49:58
Radiation exposure for residents50:01
Residents get radiation exposure survey50:03
Screening survey was made for residents50:21
Restriction of food and drinking50:24
Restriction on food and waterwas made on March 17, 201150:27
Restriction on water was made on March 19, 201150:39
Limitation of power supply50:53
Shortage of power supply50:57
Total power consumption in FY2011 in Japan was reduced51:24
Nuclear liability51:37
Supplementary legal framework of nuclear liability51:38
Disputes Committee on Nuclear Liability52:19
Current situation of decontamination52:35
Demonstration experiments of decontamination52:38
Radioactive materials (Cs-137)52:40
Basic policy53:07
Demonstration experiment of decontamination53:59
Development of decontamination54:06
Special law for decontamination54:10
Two steps of goal54:38
Decontamination is made at various places.(1/2)55:23
Decontamination is made at various places.(2/2)55:30
Long-term stepstowards decommissioning55:46
Mid-long-term roadmap55:50
Three phases55:52
Decommissioning of nuclear plants56:41
Reactor cooling is to be continued until fuel debris is removed56:51
Inter-building leakage57:38
Removal of fuels - 158:15
Removal of fuels - 258:39
Removal of fuels - 358:49
Verification of the inside of PCV59:27
Removal of fuels - 459:51
Removal of fuels - 559:57
Decommissioning of reactor facilities01:00:22
Demolition is to be made using the results of research and development01:00:32
Current situation01:00:35
Currently TEPCO makes a progress step by step01:00:37
Operation of circulating injection cooling system 01:01:02
Removal of debris from the upper part of the reactor buildings 01:01:06
Design of cover for taking out of fuels01:01:19
Situations of other nuclear power stations01:01:36
Nuclear power stations in Tohoku District01:01:41
Height of site at NPS and estimation of tsunami01:01:44
External power supply01:02:38
Flooding around the major buildings01:03:09
Fukushima Dai-ni NPS01:03:18
Onagawa NPS01:03:29
Tokai Dai-ni NPS01:03:46
Implementation of stress tests01:03:54
Counter measures against tsunami - 101:03:58
Counter measures against tsunami - 201:04:08
Test safety margins01:04:16
Conclusions and lessons learned01:04:59
Conclusions and lessons - 101:05:03
Conclusions and lessons - 201:05:53
Conclusions and lessons - 301:06:34
Conclusions and lessons - 401:07:01
Conclusions and lessons - 501:08:03
Conclusions and lessons - 601:09:00
Thank you for your attention01:09:30