Man made disaters
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Transcript of Man made disaters
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Man Made Diasters
A presntation by
7 CVirat Singh Class
St, Mary’ s Convent Inter College, Manak Nagar, Lucknow, India
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The disaster at Chernobyl
The worst manmade disaster in human history
By Virat Singh Class 7 C
St, Mary’ s Convent Inter College, Manak Nagar, Lucknow, India
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Where is Chernobyl?
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Chernobyl • Built in 1978-1979
• Chornobyl
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Background
Reaktor Bolshoy Moshehnosty Kipyashiy
RBMK, a Russian acronym translated roughly means “reactor (of) high power (of the) channel (type)”
It was a reactor cooled by water and moderated by graphite
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RBMK Reactor
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Fuel assemblies
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Reactor Plant Scenario
1. As the reaction occurs, the uranium fuel becomes hot
2. The water pumped through the core in pressure tubes removes the heat from the fuel
3. The water is then boiled into steam
4. The steam turns the turbines
5. The water is then cooled
6. Then the process repeats
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The day of disaster
25 April 1986
• 01:00 The preparation for the test• 13:47 Lowering of the reactor power
halted at 1,600 MWt• 14:00 The ECCS was isolated• 23:10 The power reduction resumed
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26 April 1986• 24:00 Operation shift change• 24:28 Power level is now 500 MWt and kept
decreasing to 30 MWt• 24:40 The operator withdrew some control rods • 01:00 Power had risen to 200 MWt• 01:03 Connecting the fourth main cooling pump
to the left loop of the system 200 MWt• 01:07 Connecting the fourth main cooling pump
to the right of the loop system - this was a violation of NOP
Continued to next slide
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26 April 1986• 01:19 Increased feed water flow to the
steam drums and removed more control rods -violation of NOP
• 01:23 The test was started• 01:23:10 Automatic rods withdrawn from
the core• 01:23:21 Two groups of automated
control rods were back to the coreContinued to next slide
Continued from last slide
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26 April 1986 • 01:23:30 Power kept increasing• 01:23:40 Emergency button pushed• 01:23:44 Power is at 300000 MW th• 01:23:48 1st thermal explosion• 01:23:55 2nd explosion
Continued from last slide
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Human Errors• Isolation of the emergency core cooling
system• Unsafe amount of control rods withdrawn• Connection of the four main cooling pumps
to the right and left of the system
Continued to next slide
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Human Errors The mental model
The operator did not have a good mental model of the system itself
The overconfidence
By having an electrical engineer on site for an electrical test
The confirmation of cues not obtained from the system
The beta was too high
Many signals were missed before the accident
Continued from last slide
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Accident Prevention
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System Analysis
• Use of graphite as a moderator• Lack of a well-built containment structure• Inadequate instrumentation and alarms for
an emergency situation• There were no physical controls that
prevented the operators from operating the reactor in its unstable state
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Summary of FactsApril 26, 1986:
Chernobyl nuclear power plant• Operator errors caused a
reactor explosion• Explosion released 190 tons
of radioactive gasses into the atmosphere
• Fire started that lasted 10 days
• People: – 7 million people lived in the
contaminated areas and 3 million of them were children
• Wind:– Carried radiation to far distances
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Far Reaching Radiation
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Radioactive fallout
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Direct Casualties 5.5 million people still live in
contaminated areas• 31 people died in 3 months of
radiation poisoning• 134 emergency workers
suffered from acute radiation sickness
• 25,000 rescue workers died since then of diseases caused by radiation
• Cancer afflicts many others• Increased birth defects,
miscarriages, and stillbirths
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Indirect Casualties
– By the year 2000 there were 1800 case of thyroid cancer in children and adolescent
– High number of suicide and violent death among Firemen, policemen, and other recovery workers
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Environment Impact
• Areas still impacted today:– Soil– Ground Water– Air– Food
• Crops • Livestock
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Problems TodayThe Sarcophagus
– After the disaster, a huge cement box was built around the radioactive material
– It is falling apart!– According to a 2003 report by
the Russian Atomic Energy Minister, Alexander Rumyantsev, "the concrete shell surrounding the Chernobyl nuclear reactor is in real danger of collapsing at any time."
– A new Sarcophagus is scheduled to be completed in 2012
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Recommendations
• Have proper Standard Operating Procedures (SOP) for both normal and emergency situations
• Have scheduled trainings and practices for normal and emergency situations
Continued to next slide
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Recommendations • A reactor expert must be always there on
site • Any cues from the system must be
confirmed by operators before making hypothesis or take action
• An environment of team work must be formed so that every body is involved
Continued from last slide
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