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Fresh water pumped into reactor at Japan nuclear plant
Published in Saudi Press Agency on 26 - 03 - 2011

Akhir 21, 1432 H/March 26, 2011, SPA -- The operator of a stricken nuclear power plant in
north-eastern Japan started Saturday to inject fresh water into an
overheating reactor, dpa reported.
The operator, Tokyo Electric Power Co (TEPCO), started pumping
water into reactor 2 at Fukushima 1 nuclear power plant as workers
tried to restore light and power to the control room in their efforts
to get the reactor's cooling system operational.
The plant was damaged by the March 11 earthquake and resulting
tsunami.
Radiation-contaminated water has been found near four of its
reactors, which it was feared might have seeped from damaged Reactor
cores or spent-fuel pools.
The operator has vowed to clear the radioactive water as quickly
as possible to allow workers access to the reactors as they attempt
to restore the cooling systems.
On Thursday, three engineers working on the cooling system at
reactor 3 were exposed to radiation levels in water at 10,000 times
the normal level.
Those levels suggested the vessel might have been damaged and
leaked radioactive materials, Hidehirko Nishiyama, a spokesman for
the government's nuclear safety commission, told a news conference.
The three workers' radiation exposure was believed to have been at
levels amounting to 173 to 180 millisieverts.
Two of the three workers were hospitalized Thursday with beta ray
radiation burns to their legs caused by direct exposure, TEPCO said.
Authorities have identified eight radioactive substances in
stagnant water in the basement of part of the plant, an analysis
released Saturday by the commission showed.
The highest levels found in the water in reactor 1 of the plant
were of caesium 137, a radioactive isotope that was released into the
environment in the Chernobyl disaster. It appeared at levels of 1.8
million becquerel.
Caesium 137, in contrast to radioactive iodine, has a relatively
long half life of 30.2 years. It is created during nuclear fission.
The water also contained caesium isotopes 134 and 136 as well as
iodine-131.
Seventeen workers at the plant have been diagnosed as contaminated
since the plant was damaged in a March 11 earthquake and resulting
tsunami. That figure includes only those who have been exposed to
more than 100 millisieverts of radiation, the maximum allowed
exposure for a nuclear plant worker for an entire year.


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