fukushima daiichi nuclear accident updatefukushima daiichi nuclear accident update october 22, 2014...
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Fukushima Daiichi Nuclear Accident Update
October 22, 2014
David Sanderson Osher Lifelong Learning Institute
Fall 2014
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Fukushima - Daiichi
THE REACTORS THE ACCIDENT
THE CONSEQUENCES
THE LESSONS LEARNED
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Nuclear Power in Japan on March 2011
• 54 operating nuclear reactors (49 GWe) • 30 BWR • 24 PWR
• Others under construction, testing, planning
• Nuclear produces 29% of Japan’s electricity
• Fukushima Daiichi: six boiling water reactors
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Fukushima - Daiichi
Reactors 1, 2 and 3 operating Reactors 4, 5 and 6 shutdown for maintenance, inspection, refueling
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Nuclear Reactors • Unit 1: 439 MWe BWR, 1971 • Unit 2: 760 MWe BWR, 1974 • Unit 3: 760 MWe BWR, 1976 • Unit 4: 760 MWe BWR, 1978 • Unit 5: 760 MWe BWR, 1978 • Unit 6: 1067 MWe BWR, 1979 Used Fuel • 6 pools, one per reactor (34%) • 1 shared pool (60%) • Dry cask storage (6%)
Unit 3 Unit 4 Unit 2 Unit 1
Unit 5 Unit 6 (under
construction)
Fukushima Daiichi
Photo from 1978
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Reactor: BWR Drywell
Wetwell
Spent Fuel Pool
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Fukushima - Daiichi
THE REACTOR
THE ACCIDENT
THE CONSEQUENCES
THE LESSONS LEARNED
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Tohoku Earthquake
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Tohoku Earthquake • Japan was hit by a magnitude 9 earthquake on March 11
(2.46pm Japan time), centered offshore of the Sendai region (Tokyo is about 250km southwest).
• A 14 m (46 ft) tsunami followed, as well as significant aftershocks and fires at many industrial facilities.
• Over 10,000 dead, 17,400 missing and a scarcity of potable water, food and electricity over 1000s sq.mi. (Final count = more than 23,000 dead)
• Widespread destruction of electrical, transportation and communications infrastructure.
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Tohoku Earthquake 11 March 2011 – 14:46
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GAL = galileos gal to g’s
100 gal = 0.102 g’s
VA Earthquake Highest Acceleration:
≈ 120 gal
Ground Acceleration
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Acceleration Damage
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• Reactor shuts down
• Cuts off turbine building
• Diesel generators start
• Emergency core cooling systems are supplied
• Plant is in a stable safe state
SHUTDOWN / TRIP
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Tsunami
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Plant Design Tsunami Height - up to 6.5m Actual Tsunami Height - 14+ m Flooding: Diesel Generators Essential Service Water Building Station Blackout Failure of all but one emergency core cooling systems
Accident Progression
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Accident Progression
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Accident Progression
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Accident Progression Steam & water temp:
~ 550 F (~287 C)
No water going in
Steam going out
Relief valve opens
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Accident Progression
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Accident Progression
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Accident Progression
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Accident Progression
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Accident Progression
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Accident Progression Unit 1 & 3
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Accident Progression Unit 2
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Accident Progression
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Accident Progression Unit 4
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Accident Progression Spent Fuel Pools
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Timeline: First Two Days 04 00 12 16 08 24 20
1446
1527
1546 1700
1930
04 00 12 16 08 24 20
0650 0415 1536
Mar 11
Mar 12
Quake; reactors 1, 2,
3 trip First tsunami wave
14 meter wave
Water @ top of U-1 fuel
U-1 core exposed
U-3 fuel rods exposed
U-1 core melted
U-1 Rx Bldg explosion
1900
Sea water injected into U-1 Rx
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Timeline: Third and Fourth Day 00 04 12 16 08 24 20
0242
Mar 13
04 00 12 16 08 24 20
Mar 14
U-3 injection stops
0700
U-3 water reaches top of fuel
0900
U-3 core damage begins
1101
U-3 reactor building explodes
1315
U-2 injection stops
1800
U-2 water reaches top of fuel
2000
U-2 core damage begins
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Challenges • No way to run equipment • Limited if any instrumentation • No lighting • Limited offsite communication
No electrical power
• No way to remove decay heat • Water in reactor boils away • Fuel damage/melt
No heat sink
• Roads to site were damaged • No way to deliver portable
equipment
No site access
• Long working hours • No sleeping accommodations • No communications with families
Personnel issues
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Fukushima - Daiichi
THE REACTOR
THE ACCIDENT
THE CONSEQUENCES THE LESSONS LEARNED
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Radiation Release • CT Scan: 6 -18 mSv
• Monitoring underway for 2 million residents of
Fukushima • 40% received less than 1 mSv; • <1% received more than 20 mSv • Remainder were between 1 and 20 mSv
• Significant doses occurred to some workers in the first few weeks • 167 workers received >100 mSv • Emergency dose limit was raised to 250 mSv until
December 2011, now set at 100 mSv
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March 12: Sea Water continued to be used for cooling Reactors March 15: Units 1 & 3 Stable March 17: Unit 2 Stable March 20: Units 5 & 6 in cold shutdown March 22: Power restored on site March 25: Switch to fresh water for core cooling
Recovery
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May 6: Enter Unit 1 building for the first time June 15: Sea Water Filtering system begins operation August 10: Circulating cooling water restored for all units Sept. 30: Units 1-3 are below boiling October 3: Japanese Government to assist with clean up efforts
Recovery
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Dec 19: All Units in cold shutdown Dec 26: Cancellation of Nuclear Emergency Situation was declared
Recovery
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Reactor Cores • Major fuel melt in 3 units, but fuel remains
essentially contained • Unit 2 containment appears to be breached
soluble fission products released with cooling water
• Stable cooling with treated recycled water has been established
• Access gained to all three reactor buildings • Nitrogen injected to ensure an inert
atmosphere
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Spent Fuel Pools • The spent fuel storage pools survived the
earthquake, tsunami and hydrogen explosions without significant damage to the fuel or significant radiological release, or threat to public safety.
• The new cooling circuits with external heat exchangers for the four ponds are working well and temperatures are normal.
• Analysis of water has confirmed that most fuel rods are intact.
• Fuel assemblies are now being removed from unit 4 pool.
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Spent Fuel Pools
Removal of fuel from spent fuel pools Fuel debris retrieval
Unit 1 FY 2017 FY 2020 to 2022
Unit 2 FY 2017 to FY 2023 FY 2020 to 2024
Unit 3 2015 FY 2021 to 2023
Unit 4 2014 not applicable
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Contaminated Water Management
• A large amount of contaminated water has accumulated on site.
• New water treatment plant commissioned in June 2011 • In 2013 a more sophisticated water treatment plant was
commissioned. • Some radioactivity has been released to the sea, but
this has mostly been low-level and it has not had any significant impact beyond the immediate plant structures.
• Concentrations outside plant structures have been below regulatory levels since April 2011.
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Groundwater Contamination • Groundwater bypass built to reduce the groundwater
level above the reactors by about 1.5 metres, discharging the uncontaminated water into the sea.
• This prevents some of it flowing into the reactor basements and becoming contaminated.
• An impermeable wall is being constructed on the sea-side of the reactors, and inside this, a frozen soil wall will further block water flow into the reactor buildings.
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Fukushima - Daiichi
THE REACTOR
THE ACCIDENT
THE CONSEQUENCES
THE LESSONS LEARNED
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Design Basis and beyond • Design Basis: what is it?
• Anticipation of events that could happen • Installation of equipment to deal with these events
• Fukushima Design Basis included an earthquake and tsunami • This tsunami was much larger than original design
• What if the unexpected occurs beyond design basis?
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Industry response (US) • Review (again) all design bases • Identify possible hazards that could be outside design
bases • Identify critical safety functions • Make modifications, purchase equipment to
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Possible hazards • Earthquake • Flooding • High wind/tornado • High/low temperature
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Critical safety functions • Decay heat removal • Electrical power • Reactor coolant inventory • Containment integrity • Support functions
• Site access • Communication • Lighting • Life support
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Modifications • Emergency electrical hookups
• Portable generators • Emergency liquid connections
• Keep fuel covered • Keep fuel cool • Portable pumps • Alternate sources of water
• A building to store the new equipment • Plans to use the new equipment • Plans to get resources from offsite • Standardization across the industry