Activities of Toshiba for Fukushima restoration

Transcription

1 Activities of Toshiba for Fukushima restoration - WM2016 Panel Session #091 - March 9,2016 TOSHIBA Corporation Nuclear Chemical Engineering and Design Masamichi Obata 2016 Toshiba Corporation

2 Contents TOSHIBA International Team at Early Stage On-site Roadmap for Restoration Activities Emergency Response Establish the water treatment system Installation of 1 st Water Treatment System Installation of 2nd Water Treatment System Achieve Cold Shutdown Installation of MRRS TM System Debris Removal from SFP Leakage inspection Off-site Off-site Radioactive Waste TOSHIBA for Off-site Radioactive Waste 2016 Toshiba Corporation 2/15

3 TOSHIBA International Team at Early Stage Power and Industrial Systems R&D center Data link Engineering Team 100persons 800persons Government TEPCO Join the government meeting Response to a technical request Technical proposal/ TEPCO HQ Team of Toshiba 40persons Continually information sharing Send information as needed/tv mtg. for 24 hours Toshiba team at Fukushima Daiichi site 800 persons contract in an emergency Draft a convergence roadmap TV conference Toshiba Headquarter 30persons US-JPN International Team 20persons Team Mt. Fuji Keihin factory 100persons Fuchu factory 100persons TPSC IHI Group Company TANE (US) 2016 Toshiba Corporation 3/15

4 Roadmap for Restoration Activities 2011 ~ Take emergency response Monitor and evaluate Cold shutdown Monitor Cold shutdown condition 2021 ~ 3/11 Cold shutdown Maintain Plant stability (Water injection Accumulated water treatment) SFP fuel removal Repair PCV Prepare toward phase 2 Sample: Unit 2 SFP cooling α treatment system (for U, Pu, etc.) fuel debris removal Dismantling Reactor building PCV emission Short 小循環 circulation α treatment system (for U, Pu, etc.) N2 Injection Water Treatment System Period to the start of fuel removal from SFP Debris removal from SFP Decontamination of plant site/ Environment improvement Installation of equipment for SFP fuel removal CSFP modification (receipt of fuel) Install S/C Short circulation line Water removal from Building Install water treatment system Water stop R/B-T/B Period to the start of fuel debris removal PCV/RPV leakage inspection Repair PCV or grouting Install equipment for fuel debris removal Prepare pool for fuel debris Dismantling Reactor Bldg. Complete removal and transport fuel debris Prepare waste treatment Disassemble Buildings interfering with the surroundings 2016 Toshiba Corporation 4/15

5 Emergency Response Preparation of emergency measures Recovery of Electric Power Supply Car batteries for I&C power supply (2,000 units) Installation of Cables High-voltage cables: 2,000m Low-voltage cables : 23,400m Urgent core cooling by seawater injection Connection hose and cables Submerged pumps (52 sets) Counter measures for hydrogen Explosion Drill the roof of reactor building (Water jet and core drill) Mock up test had done Water Jet Mock up Test H 2 explosion (~10days) Emergency Reducing response radioactive release I&C: Instrumentation and Control Jul., 2011 Dec., 2011 Achieving cold shutdown HVAC: Heating Ventilation and Air Conditioning and Cooling System Mid- & long-term countermeasures 2016 Toshiba Corporation 5/15

6 Establish the water treatment system Highly contaminated water accumulated in T/B Nearly 70,000 tons of contaminated water as of April 19, 2011 Urgent water transfer is required to Rw/B Established recirculation loop for water treatment system Huge volume of construction #1 R/B T/B #2 #3 #4 (outage) RW/B P P River Cooling water injection Desalination Cs removal RO AREVA KURION Transfer piping installation 4,100m with 3,000welding points H 2 explosion (~10days) Emergency Reducing response radioactive release Jul., 2011 Dec., 2011 Achieving cold shutdown Mid- & long-term countermeasures Rw/B: Radioactive Waste Building RO: Reverse Osmosis Cs: Cesium 2016 Toshiba Corporation 6/15

7 Installation of 1 st Water Treatment System International collaboration KURION & AREVA systems was integrated by Toshiba 24-hrs-a-day work to meet schedule Just two months for delivery Designed started on April 11, and delivered on June 17 Water Level of Unit 2 Turbine Building F-2 T/B Water Level (OP, mm) #2 T/B Water Level Allowable Limit of #2 T/B Water Level (OP4000) Start Transfer Start Operation on June 17, /19 5/22 5/25 5/28 5/31 6/3 6/6 6/9 6/12 6/15 6/18 6/21 6/24 6/27 6/30 7/3 7/6 7/9 Date 2016 Toshiba Corporation 7/15

8 Installation of 2nd Water Treatment System Simplified Active water Retrieve and Recovery System Increase the stability and redundancy of contaminated water treatment Only 2.5 months to go in service. Major role among water treatment systems since October, 2011 Major Characteristics Reduction of media changes Shielding design for workers Stable operation Simplified Active water Retrieve and Recovery System (SARRY TM ) Cesium Removal DF(target): ~6 DF: Decontamination Factor H 2 explosion (~10days) Emergency Reducing response radioactive release Jul., 2011 Dec., 2011 Achieving cold shutdown Mid- & long-term countermeasures 2016 Toshiba Corporation 8/15

9 Achieve Cold Shutdown Improve reliability for core cooling Installed another injection line using Core Spray line to enhance redundancy and to make direct cooling possible Install temporary SFP cooling system Installed within a week in the severe dose rate area in Unit 2 Remarkable temperature reduction from approx. 70 o C to 40 o C on the first day SFP Cooling Tower H 2 explosion (~10days) Emergency Reducing response radioactive release Jul., 2011 Dec., 2011 Achieving cold shutdown Mid- & long-term countermeasures 2016 Toshiba Corporation 9/15

10 Installation of MRRS TM System MRRS TM (Multi Radionuclide Removal System) Conceptual design by EnergySolutions Detailed design and manufacturing by Toshiba Performance Reduce all residual radioactivity Strontium was identified as the major nuclide. With MRRS TM, the radioactivity level will become lower by two order of magnitude. H 2 explosion (~10days) Emergency Reducing response radioactive release Jul., 2011 Dec., 2011 Achieving cold shutdown Mid- & long-term countermeasures 2016 Toshiba Corporation 10/15

11 Debris Removal from SFP Metal debris in Spent Fuel Pool was characterized carefully with 3D-CAD technology to remove them from the pool safely. Generate 3D configuration of metal debris and characterize them from 2D photo/video image data using our 3D-CAD technology. Establish most reliable debris removal procedures and tools using 3D configuration of debris. 1. Photo Image was Converted to 3DCAD 2. Establish removal procedures and tools H 2 explosion (~10days) Emergency Reducing response radioactive release Jul., 2011 Dec., 2011 Achieving cold shutdown Mid- & long-term countermeasures 2016 Toshiba Corporation 11/15

12 Leakage inspection Leakage inspection for PCV Vent Pipe Develop Quadruped robot with compact inspection vehicle 8 vent pipes of PCV in Unit 2 was inspected, and no leakage was found. Quadruped Robot PCV Vent pipe Quadruped Robot Suppression Chamber Catwalk Suppression Chamber Compact Inspection Vehicle Image of vent pipe inspection by Quadruped Robot H 2 explosion (~10days) Jul., 2011 Dec., 2011 Emergency response Reducing radioactive release Achieving cold shutdown Mid- & long-term countermeasures 2016 Toshiba Corporation 12/15

13 TOSHIBA for Off-site Radioactive Waste Utilize TOSHIBA nuclear technology for off-site decontamination work Visualize contamination distribution Remove Cesium from water and soil Reduce and stabilize radioactive Gamma camera for low-dose at off-site Contaminated water treatment system Contaminated soil cleanup system Contaminated material Incineration treatment system SARRY TM series (Water cleanup, soil cleanup ) Incineration, Ash Treatment, etc 2016 Toshiba Corporation 13/15

14 Conclusion Fukushima restoration activities are important for Japanese nuclear industry recovery. TOSHIBA has been involving to solve problems of Fukushima and applying international experiences and practices to each problems though many companies. It is fundamental to have international experiences and practices though international collaboration to solve Fukushima issues. Any information, experiences, practices are highly appreciated. TOSHIBA believes some feedbacks from Fukushima will be able to apply to projects outside Japan in future, if there are good international collaborations Toshiba Corporation 14/15

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