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Chernobyl: How human error, not quake, led to meltdown
Published in Saudi Press Agency on 17 - 03 - 2011

Akhir 12, 1432 / March 17, 2011, SPA -- The unfolding disaster at a Japanese nuclear power
plant comes on the eve of the 25th anniversary of the worst nuclear
accident in history: the explosion of a reactor at the Chernobyl
power plant in what is now an independent Ukraine, according to dpa.
That accident, caused by operator error, resulted in a massive
release of radiation that spread across the western Soviet Union and
parts of western Europe. Some 30 workers died in the immediate
aftermath, according to the UN Scientific Committee on the Effects of
Atomic Radiation.
The number of subsequent deaths attributable to radiation from the
accident is subject to dispute. One researcher claims the figure
could be as high as a million.
April 26, 1986, 1:00 am - Workers at the Chernobyl nuclear power
station begin testing backup power for reactor 4's cooling system.
The test requires most safety equipment to be switched off and the
speed of the reaction inside the reactor to be reduced to very low
and unstable levels.
April 26 1986, 1:23 am - Workers lose control over the reaction
process. Two explosions, one from superheated steam and a second from
what may have been a very low-grade nuclear blast, destroy the
reactor building.
April 26 1986, 1:31 am - Firefighters begin attempts to extinguish
fires fed by the still-hot reactor core, which is now exposed to the
sky.
April 28 1986 - Mass evacuation begins of villages and towns
within 30 kilometres of the reactor. More than 300,000 eventually
leave their homes forever.
April 28 1986 - A radioactive cloud containing traces of
strontium, cesium and plutonium reaches Sweden and Finland. It is
detected and reported in western media. Soviet denials follow.
April 30 1986 - Soviet state-controlled media report "problems" at
the power station in the first official Kremlin acknowledgment of the
disaster.
May 3 1986 - Helicopters dropping concrete and sand on the remains
of reactor 4 cover the nuclear core sufficiently to stop the release
of radioactive smoke and debris.
May 7 1986 - First Soviet news conference on Chernobyl. Officials
assert the problem is limited in scale and well under control.
May 9 1986 - The Soviet Politburo holds its first emergency
meeting on the disaster.
May 14 1986 - Soviet leader Mikhail Gorbachev appears on
television and admits the massive scale of the catastrophe, ending
weeks of official denials.
July 19 1986 - Chernobyl plant manager and chief engineer are
sacked for "gross mismanagement." Most workers involved in the failed
reactor test are long dead from radiation poisoning.
August 25 1986 - The Soviets admit several critical design flaws
but nonetheless say the main cause of the accident was poorly
enforced safety procedures and human error.
November 1986 - Construction is completed of a concrete and steel
shelter, or sarcophagus, covering the remains of reactor number 4.
November 1996 - Ukraine, now an independent country, shuts down
reactor number 1.
December 2000 - Ukraine shuts reactor number 3, ending electricity
production at Chernobyl. G7 nations promise Ukraine more than 1
billion dollars to make repairs to the sarcophagus and to help
develop alternate sources of nuclear power.
August - October 2004 - International Chernobyl-related assistance
to Ukraine is stalled. Ukraine brings on line two new nuclear power
plants - in Rivne and Khmelnitsky - using technology slightly more
advanced than that at Chernobyl.
G7 nations criticize the two reactors as much less safe than those
used in developed countries.


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