Current Status of Roadmap towards Restoration from the Accident at Fukushima Daiichi Nuclear Power Station, TEPCO (Revised edition)

Transcription

1 Current Status of Roadmap towards Restoration from the Accident at Fukushima Daiichi Nuclear ower Station, TECO Revised edition) As of April 17 Step 1 around 3 months) Step 2 around 3 to 6 months after achieving Step1) current status as of July 17) Appendix 1-3 July 19, 2011 Nuclear Emergency Response Headquarters Government-TECO Integrated Response Office Red colored: newly added to the previous version, : already reported to the government Mid-term issues around 3 years) I. Cooling 1 ) Reactor Fresh water Injection Cooling by minimum injection rate injection cooling) Consideration and preparation of reuse of accumulated water Improvement of work environment Circulating Injection Cooling start) Nitrogen gas injection Stable cooling Circulating Injection Cooing continued) Cold shutdown condition Continuous cold shutdown condition rotection against corrosion cracking of structural materials* *partially ahead of schedule II. Mitigation )Spent Fuel ool 3 ) Accumulated Water ) Ground water ) Atmosphere / Soil Fresh water injection Transferring water with high radiation level Storing water with low radiation level Reliability improvement in injection operation / remote-control operation *ahead of schedule Circulation cooling system installation of heat exchanger) *partially ahead of schedule Installation of storage / processing facilities Installation of storage facilities / decontamination processing Mitigation of contamination of groundwater Consideration of method of method of of shielding shielding wall wall of of groundwater Dispersion of inhibitor Removal of debris Stable cooling Secure storage place Mitigate ocean contamination Mitigate scattering Remote-controlled injection operation Consideration / installation of heat exchanging function Expansion / consideration of full-fledged processing facilities Decontamination / desalt processing reuse), etc Storage / management of sludge waste etc. Mitigation of contamination in the ocean Sub-drainage management with expansion of storage / processing facilities) Design / start of implementation of shielding wall of groundwater Installation of reactor building cover Unit 1) Removal of debris top of Unit 3&4 R/B) Consideration of reactor building container More stable cooling Reduction of total amount of contaminated water Mitigate ocean Contamination continued) Mitigate scattering continued) Start of removal work of fuels Installation of full-fledged water processing facilities Continuous processing of accumulated water Research of processing of sludge waste etc. Mitigation of contamination in the ocean Solidification of contaminated soil, etc Establishment of shielding wall of groundwater Removal of debris / installation of reactor building cover Unit 3&4) Start of installation work of reactor building container

2 Current Status of Roadmap towards Restoration from the Accident at Fukushima Daiichi Nuclear ower Station, TECO Revised edition) Red colored: newly added to the previous version, : already reported to the government Issues As of April 17 Step 1 around 3 months) Step 2 around 3 to 6 months after achieving Step1) current status as of July 17) Mid-term issues around 3 years) 6 III. Monitoring/ Decontamination ) Measurement, Reduction and Announcement Expansion, enhancement and announcement of radiation dose monitoring in and out of the power station Start of full-fledged decontamination Decontamination Continuous environmental monitoring Continuous decontamination IV. Countermeasures against aftershocks, etc ) Tsunami, Reinforcement, etc 7 Enhancement of countermeasures against aftershocks and tsunami, preparation for various countermeasures for radiation shielding Unit 4 spent fuel pool) Installation of supporting structure Consideration / implementation of reinforcement work of each Unit Mitigate disasters Continue various countermeasures for radiation shielding Reinforcement work of each Unit V. Environment improvement ) Life/work environment 8 9 ) Radiation control / Medical care Improvement of workers life / work environment Improvement of radiation control / medical system Enhancement of environment Improvement Enhancement of Healthcare Improvement of workers life / work environment Improvement of radiation control / medical system Measures for Mid-term issues Government s concept of securing safety Establishing plant operation plan based on the safety concept Response based on the plant operation plan

3 Nitrogen gas injection 2, 11, 15) CV venting with filtration) 10) Flooding up to top of active fuel 3, 9) Heat Exchanger Installation of heat exchangers 13) Overview of Major Countermeasures in the ower Station as of July 17 Reactor building cover 5, 50, 54, 55, 84) Full-fledged container 50, 56) Cooling of spent fuel pool by external water injection 18, 22, 28) Lower the amount of steam generated 4) Maintain and enhance countermeasures in Step 1 if needed 17) Red frame: deleted countermeasures, red colored: newly added countermeasures, : already reported to the government Reactor Building rimary Containment Vessel CV) Reactor ressure Vessel RV) Sampling of steam/pool water and measurement of radioactive materials 19) Tank rocessing high radiation-level water 31, 38, 43) Storage / management of sludge waste etc. 81) Consideration of full-fledged water processing facilities 82) Turbine Building Steam Turbine of fresh water with pumps 1) ⅲInjection Condenser piping Circulation cooling of spent fuel pool 23, 24, 25, 27) Desalination Water processing facility Decontamination Adsorption Cooling at minimum water injection rate 7, 12, 14) Reuse of processed water 45) Implement circulating injection cooling) Oil separation pumps Centralized Waste rocessing Building heat exchangers, water processing facilities Storage/process of low radiation-level water 33, 34, 35, 40, 41, 44, 46) Storage: tanks, megafloats rocess: decontamination by zeolite Storage of high radiation-level water 30, 32, 37, 39, 42) Additionally-installed Tank rocessing of sub-drainage water after being pumped up 36) revent contamination of groundwater 66, 67); Consideration of shielding wall of groundwater68, 83) Improvement of life/work environment of workers74, 75); improvement of site environment76) Enhancement of radiation control 77, 78); Enhancement of medical system 79, 80) Suppression Chamber Sealing the leakage location 6, 16) Dispersion of inhibitor 47, 48, 52) Removal of debris 49, 53) Consideration of countermeasures for contaminated soil 51) Seismic assessment 20),Continued monitoring 21), Unit 4) Installation of supporting structure under the bottom of spent fuel pool 26) Install various interconnecting lines of offsite power8); enhance countermeasures against tsunami 69, 70); consideration of reinforcement work of each Unit 71); various countermeasures of radiation shielding 72, 73) Continue/Enhance monitoring 55~62), Consideration of necessary measures to reduce radiation dose 63) reventive measures against leakage of high radiation-level water 29) revent contamination in the ocean 64) Isolation of high-level radioactive water 65)

4 Unit Current Status of Countermeasures 1) revious status as of June 17) <Step 2 about 3 to 6 months from now)> : Release of radioactive materials is under control and radiation dose is being significantly held down 1 Current status as of July 17) ⅳNitrogen gas injection [Countermeasure 11] Start of circulating injection cooling Implementation of circulating injection cooling [Countermeasures 12,14,45] [Countermeasures 12,14,45] - water injection started with processed accumulated water Construction of centralized monitoring system in the main anti-earthquake building, etc. I. Cooling 1 )原2 子炉3 ) Reactor Improvement of work environment [Countermeasure 76] RV 圧力容器底部温度 bottom temperature 3/19 4/8 4/28 5/18 6/7 6/27 7/17 Start of circulating injection cooling Implementation of circulating injection cooling [Countermeasures 12,14,45] [Countermeasures 12,14,45] - water injection started with processed accumulated water Construction of centralized monitoring system in the main anti-earthquake building etc. Consideration of leakage sealing measure of CV [Countermeasure 6] Nitrogen gas injection [Countermeasure 11] from June 28) RV bottom temperature 圧力容器底部温度 3/19 4/8 4/28 5/18 6/7 6/27 7/17 Start of circulating injection cooling Implementation of circulating injection cooling [Countermeasures 12,14,45] [Countermeasures 12,14,45] - water injection started with processed accumulated water Construction of centralized monitoring system in the main anti-earthquake building etc. Continue To Step2 3 ] Cold shutdown condition Improvement of work environment [Countermeasure 76] Nitrogen gas injection [Countermeasure 11] from July 14) RV 圧力容器底部温度 bottom temperature 3/19 4/8 4/28 5/18 6/7 6/27 7/17 : Implemented monitored by government as necessary) : Safety check by government report)

5 Unit Current Status of Countermeasure 2) revious status as of June 17) <Step 2 about 3 to 6 months from now)> : Release of radioactive materials is under control Current status as of July 17) and radiation dose is being significantly held down ⅴWater injection through normal cooling system [Countermeasure 24] 1 Cooling by installation of heat exchanger [Countermeasures 25,27] Consideration / Design Installation I. Cooling ) ) Spent Fuel ool 原子炉3 Cooling by installation of heat exchanger [Countermeasures 25,27] - Circulating water cooling operation from May 31) Water injection through normal cooling system [Countermeasure 24] Cooling by installation of heat exchanger [Countermeasures 25,27] - Circulating water cooling operation from June 30) 5 ] More stable cooling Restoration of water injection through normal cooling system [Countermeasure 24] - Water injection by installation of alternative system to Giraffe June 17 ) 4 Cooling by installation of heat exchanger [Countermeasures 25,27] Consideration / Design Fabrication / Transportation Installation : Implemented monitored by government as necessary) : Safety check by government report)

6 II. Mitigation 3 ) Accumulated Water Current Status of Countermeasures 3) revious status as of June 17) Current status as of July 17) and radiation dose is being significantly held down [ High level ] Installation of water processing facilities [Countermeasure 38] Elimination, continuous processing and system enhancement of accumulated water in the building Elimination, continuous processing and system enhancement of accumulated water in the building [Countermeasure 43] [Countermeasure 43] reparation for Cesium adsorption expansion Installation Test operation reparation for desalination expansion distillation) rocessing start Installation term Ⅰ) Test operation term Ⅰ) rocessing start term Ⅰ) reparation for desalination expansion distillation) 8 Installation term Ⅱ) Test operation term Ⅱ) start term Ⅱ) ⅵrocessing Installation work of desalination facility Reverse osmosis) term Ⅱ) rocessing start Consideration of full-fledged water processing facilities [Countermeasure 82] Storage / management of sludge waste etc. [Countermeasure 81] Design of storage facility Secure sufficient storage place [Countermeasures 37,39,42] [Receiver tanks for high radiation level water] Site preparation June 25) [Receiver tanks for processed water] 13,000 t [ Low level ] 20,000 t July 14) Mitigation of contamination in the ocean [Countermeasure 64] Increase storage capacity / decontamination [Countermeasures 40,41] - Installation of tanks May 31: 18,400 t) - Megafloat May 21: 10,000 t) Continue decontamination [Countermeasures 44,46] - decontamination with decontaminant zeolite) May 1) <Step 2 about 3 to 6 months from now)> : Release of radioactive materials is under control Continue storage / management of sludge waste etc. [Countermeasure 81] Expand sufficient storage place [Countermeasure 42] - continuous expansion of tanks Installation 2,800 t scheduled at the end of August) 20,000 t late July) reparation Continue mitigation of contamination in the ocean [Countermeasure 64] Circulating decontamination Installation of steel pipe sheet pile Installation 7,200 t) 20,000 t / every month Installation ] Decrease the total amount of accumulated water : Implemented monitored by government as necessary) : Safety check by government report)

7 Current Status of Countermeasures 4) revious status as of June 17) <Step 2 about 3 to 6 months from now)> : Release of radioactive materials is under control and radiation dose is being significantly held down 4 ) Groundwater Implementation of preventions against expansion of groundwater contamination [Countermeasure 67] - Sub-drainage management with expansion of storage / processing facilities Consideration of method of shielding wall of groundwater [Countermeasure 68] Design of shielding wall of groundwater [Countermeasure 68] Begin establishment of shielding wall of groundwater [Countermeasure 83] Mitigation of ocean contamination 14 ] II. Mitigation 5 ) Atmosphere / Soil ⅶCurrent status as of July 17) Dispersion of inhibitor Confirmation of solidification of inhibitor [Countermeasure 52] [Countermeasure 52] -approx. 560,000 m 2 completed June 28) expanded area) Removal of debris [Countermeasure 53] - Collected debris volume of about 500 containers) as of July 17) Installation of reactor building cover Unit 1) [Countermeasures 54,55] - Unit 1: reparatory construction work May 13), Confirmation by the government June 23), Main structure construction work June 27) rocurement, manufacturing On-site construction Removal of debris on top of reactor buildings Unit 3&4) [Countermeasures 84] - Under preparatory construction Unit3: June 20, Unit4: June 24), removal of debris on top of reactor buildings 敷地境界の線量率 ] revent scattering of radioactive materials 10 Consideration of reactor building container [Countermeasure 50] III. Monitoring / Decontamination 6 ) Measurement, Reduction and Announcement Expansion, enhancement and announcement of monitoring [Countermeasures 60,61] - Monitoring in and out of the power station - Estimation of released amount Implementation of monitoring in cooperation with the government, prefectures, municipalities and operators [Countermeasures 62] Start of full-fledged decontamination [Countermeasures 63] 1.E-01 Concentration of radioactive materials in air on site 1.E-02 1.E-03 1.E-04 1.E-05 1.E-06 I-131 Cs-134 Cs E-07 3/19 3/29 4/8 4/18 4/28 5/8 5/18 5/28 6/7 6/17 6/27 B q /cm Radiation dose rate at site boundary マイクロシーヘ ルト usv/h)/ 時 ) M1 M2 M3 M4 M5 M6 M7 M8 0 4/20 5/10 5/30 6/19 7/9 ] Sufficiently reduce radiation dose 12 : Implemented monitored by government as necessary) : Safety check by government report)

8 Current Status of Countermeasures 5) revious status as of June 17) <Step 2 about 3 to 6 months from now)> : Release of radioactive materials is under control Current status as of July 17) and radiation dose is being significantly held down ⅷIV. Countermeasures against aftershocks, etc 7 ) Tsunami, reinforcement, etc Enhancement of countermeasures against tsunami [Countermeasure 70] - Installation of temporary tide barriers June 30) Unit 4) Installation of supporting structure under the bottom of the pool [Countermeasure 26] - Supporting structure effective June 18), concrete placement end of July) Continue various countermeasures for radiation shielding [Countermeasure 73] Consideration and implementation of reinforcement work of each Unit [Countermeasure 71] - Seismic resistance is being evaluated 16 ] Mitigation of disasters V. Environment improvement ) Life / work environment 8 9 ) Radiation control / Medical care Improvement of workers life / work environment [Countermeasure 74] reparation of temporary dormitories, installation of on-site rest stations Improvement of radiation control [Countermeasure 77] - Expansion of decontamination facilities installation of survey areas for rainy days and cleanser decontamination areas - Introduction of bar-code readers for individual AD rental Continuation and enhancement of improvement of workers life / work environment [Countermeasure 75] From end of June: move to temporary dormitories by early September) Expansion of temporary dormitories and on-site rest stations / environmental improvement of meals, baths and laundry, etc. Continuous reinforcement of radiation control [Countermeasure 78] - Enhanced radiation exposure control by NISA - Expansion of whole-body counters, implementation of monthly internal exposure measurement - Automated recording of personal radiation dose, written notification of exposure dose, introduction of workers certificates with photos - Enhancement of safety training for workers, consideration of long-term healthcare such as establishing database Continuous reinforcement of medical system [Countermeasure 80] - Install new emergency medical treatment facility, establish organization with plural resident doctors on call 24 hours a day), speedy transportation of patients - Intensive preventive measures against heat stroke, countermeasures for mental health - Establish industrial hygiene system such as preventive healthcare ] Enhancement of environment improvement 18 ] Enhancement of healthcare 20 : Implemented monitored by government as necessary) : Safety check by government report)