Fukushima Decommissioning Update Fu… · Fukushima Decommissioning Update Spent Fuel Management...
Transcript of Fukushima Decommissioning Update Fu… · Fukushima Decommissioning Update Spent Fuel Management...
All Rights Reserved ©2015 Tokyo Electric Power Company, Inc.
Fukushima Decommissioning UpdateFukushima Decommissioning Update
Spent Fuel Management SeminarSpent Fuel Management SeminarThe Institute for Nuclear Materials ManagementThe Institute for Nuclear Materials Management
/U.S. Nuclear Infrastructure Council/U.S. Nuclear Infrastructure Council
Arlington, VirginiaArlington, VirginiaJanuary 13January 13thth, 2015, 2015
Kenji TateiwaKenji TateiwaManager, Nuclear Power ProgramsManager, Nuclear Power Programs
Tokyo Electric Power Company, Washington OfficeTokyo Electric Power Company, Washington [email protected]@tepco.co.jp
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Great East Japan Earthquake (March 11, 2011)
http://archive.shinsai.yahoo.co.jp/
http://archive.shinsai.yahoo.co.jp/
http://archive.shinsai.yahoo.co.jp/Cruise Ship Stranded
Houses Swept Away
Largest earthquake (M9.0) and tsunami (M9.1) in recorded history of Japan
20+ m tsunami run-up in coast line spanning 200 km
560 km2 flooded (10x Manhattan)
19,000 dead/missing
http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=77331
Epicenter
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3/16-19
3/20
3/14
3/12
42 3642 1531
3/15
3/13
3/11
Fukushima Daini (2F)Fukushima Daiichi (1F)Date(2011)
3/14 17:00
3/14 1:24RHR
3/14 7:13RHR
3/14 15:42RHR
3/14 18:00
3/15 7:15
3/12 12:15
3/20 14:30
3/19 22:14RHR
3/12 8:13D/G-6B
3/22 10:35P/C-4D
3/22 10:36P/C-4D
3/20 15:46P/C-2C
3/20 15:46P/C-2C
3/19 5:00RHR
3/20 14:30
Station Blackout
Loss of Ultimate Heat Sink
Cold Shutdown
3/12 15:36 Unit 1 Explosion
3/15 6:00-6:10 Unit 4 Explosion
3/14 11:01 Unit 3 Explosion
3/11 15:27 1st Tsunami, 15:35 2nd Tsunami 3/11 15:22~ Tsunamis
Water Injection: NOHeat Removal: NO
Water Injection: YESHeat Removal: NO
Water Injection: YESHeat Removal: YES
Overview of the 10-Unit Simultaneous Accidents
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My Post-Accident Activities
IAEA Preliminary Mission(4/6/2011@Fukushima Daiichi NPS)
IAEA: International Atomic Energy Agency
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Current Status of Fukushima Daiichi (1F)
Unit 4
Unit 3
Unit 2Unit 1
Unit 2Unit 1
Unit 3
Live Camera View(as of 1/13/2015)
http://www.tepco.co.jp/en/nu/f1-np/camera/index2-e.htmlhttp://www.tepco.co.jp/en/nu/f1-np/camera/index-e.html
View 1
View 2
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Progress Made at 1F Unit 1
Remote-operated boat and robot identified leakage locations in torus room
Torus Room (11/13/2013)
Reactor Building (3/15/2011)
Reactor Building Cover (installed in Oct. 2011)
Torus Room (5/27/2014)
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Progress Made at 1F Unit 1 (cont’d)
Reactor building cover to be dismantled in preparation for fuel removal
Removal of Roof of Cover (10/31/2014)
Condition of Refueling Floor (10/31/2014)
Schematic of Fuel Removal Structure
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Progress Made at 1F Unit 2Blow-out Panel
Closed (3/11/2013)
Inside Containment (8/12/2013)
Steam Coming Out From Blow-out Panel (4/10/2011)
Cables(U shape)
CRD replacement rail
PedestalCamera
Video images obtained inside primary containment
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Progress Made at 1F Unit 2 (cont’d)
Robot retrieved core samples from refueling floor(March 2014)
Maneuverability Testing
Progressing through Obstacles
Core Sampling of the Floor
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Progress Made at 1F Unit 3
Spent Fuel Pool (Feb. 2013)
Large Rubble Removed (10/11/2013)
Crippled Reactor Building (3/15/2011)
MSIV Room (5/15/2014)
Robot found leakage location in reactor building
main steam lineexpansion joint
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Progress Made at 1F Unit 3 (cont’d)
Rubble in spent fuel pool being removed by remote operationPreparation to construct
fuel removal structure
Fuel Handling Machine (FHM)
Mast
Fuel Removal Structure
Fuel Handling MachineOverhead
CraneRain Cover
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コンクリート壁
使用済燃料プール
鋼製支柱
コンクリート壁
鋼製支柱
<コンクリート打設後>
<コンクリート打設前>
コンクリート壁
使用済燃料プール
鋼製支柱
コンクリート壁
鋼製支柱
<コンクリート打設後>
<コンクリート打設前>
Concrete wall
Progress Made at 1F Unit 4
Fuel Removal Structure (Nov. 2013)Water Injection byConcrete Pumper (3/22/2011)
Fuel Removal from SFP (11/18/2013)SFP Structure Reinforced
(7/30/2011)
Steel Pillars
Fuel removal from spent fuel pool began in Nov. 2013
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Progress Made at 1F Unit 4 (cont’d)
Successful removal of all fuels from SFP (12/22/2014)http://www.tepco.co.jp/en/decommision/index-e.html
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Circulating-Water Core Cooling System at 1F
All reactor cores stably cooledIncreasing water inventory posing challenge
Partially-treatedWater Tanks
347,000 m3= 140 x Olympic-size pool
GroundwaterInflow
+400 m3/day 3 km-longClosed Loop
Treated Water Tanks
RadioactiveWaste
Storage
Cesium Removal (Kurion/SARRY)
Chloride Removal (RO)
Turbine Bldg.
Reactor Bldg.
Contaminated Water
Core Injection320 m3/day
Multi-nuclides Removal (ALPS)
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Tackling Water Issues: “Seven Samurai”
Multiple water treatment facilities employed to reduce risk of contaminated water
Cs+Sr Adsorption(SARRY)
Cs+Sr Adsorption(KURION)
Mobile StrontiumRemoval
Multi-NuclideRemoval (ALPS) Improved ALPS
High-PerformanceALPS
RO Water Treatment(Sr-Removal)
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Tackling Water Issues: Emergency/Fundamental Measures
(c) GeoEye/Japan Space Imaging
Groundw
ater Flow
Groundwater BypassSub-drain
Frozen-Soil Wall
Sea-Side Impermeable
Wall
Water Glass
Prevent groundwater from being contaminatedPrevent
contaminated groundwater from flowing into seaReduce
groundwater inflow into buildings
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Tackling Water Issues: Frozen-Soil Wall
Stop groundwater inflow by impermeable barrierConstruction work commenced: June 2014Plan to begin freezing soil: March 2015Freezer plant: 230 kW x 30 units
Freezer plant
Freezer plant Unit 1
Unit 2
Unit 3
Unit 4
Freezer pipes1,500 m-long circulation
of refrigerant
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Decommissioning Roadmap for 1F
Phase-1 Phase-2 Phase-3
Begin removal of fuels from spent fuel pools
Cold ShutdownCondition Achieved(Dec., 2011)
Within2 years
Within10 years
30 to40 years
Begin retrieval of fuel debris
Complete decommissioning
Global collaboration vitally important to tackle this unprecedented undertaking
Common pool
CraneFuel Handling Machine
Unit 4: Nov. 2013
Stop Leakage Flood PCV andRemove Fuel Debris
Today
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