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Fukushima No. 2 Reactor
Radiation Level Up To 73 Sieverts Per Hour
Fukushima Radiation Fear
EMF Computer Protection
Magnetic Field Detector
TOKYO (Kyodo) -- The operator of the Fukushima Daiichi
nuclear power plant said Tuesday that the radiation dose
inside the crippled No. 2 reactor stood at an extremely high
level between 31.1 and 72.9 sieverts per hour, underscoring
the existence of radioactive substances from the melted fuel
inside the structure.
Tokyo Electric Power Co. measured the radiation
level by inserting a long dosimeter into the round-bottomed,
flask-shaped primary containment vessel, where fuel is
thought to be accumulating at the bottom following the
nuclear accident last year.
Human beings could die within one month once
exposed to 7 sieverts and within several days once exposed
to 20 sieverts or more. Usually, when an ordinary reactor is
not operating, the radiation level is low enough for workers
to enter inside, according to the utility known as TEPCO.
The highest radiation dose was measured at about
4 meters from the bottom and about 1 meter away from the
vessel's interior wall. The utility said it could not check
a deeper area because the dosimeter had no camera attached.
The utility's spokesman Junichi Matsumoto said
he cannot immediately tell whether the latest outcome will
affect the current road map toward scrapping the Nos. 1 to 4
units, but added that the data can be used to study what
kind of devices should be developed for the decommissioning
work.
''One important challenge is resistance to
radiation...If we are going to use electronic devices inside
the primary containment vessel, we may have to consider
shielding the devices, or use parts that can tolerate
high levels of radiation,'' Matsumoto told a press
conference.
TEPCO carried out an industrial endoscope survey
a day before, and found the vessel filled with water only 60
centimeters deep, a lower-than-expected height considering
the amount of water injected into the reactor to keep the
fuel inside cool.
The utility used the same hole to insert the
endoscope and the dosimeter.
The No. 2 reactor is one of the plant's three
reactors that have suffered meltdown in the nuclear
accident, and its fuel is believed to have melted through
the pressure vessel and accumulated in the outer primary
container.
(Mainichi Japan) March 28, 2012
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