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Damage to Fukushima Daiichi 2 [World Nuclear News]
Posted on March 15, 2011 by mitnse
Loud noises were heard at Fukushima Daiichi 2 at 6.10am this morning. A
major component beneath the reactor may be damaged.
Confirmation of loud sounds this morning came from the Nuclear and
Industrial Safety Agency (NISA). It noted that “the suppression chamber may
be damaged.” It is not clear that the sounds were explosions.
Also known as the torus, this large doughnut-shaped structure sits in the
centre of the reactor building at a lower level than the reactor. It
contains a very large body of water to which steam can be directed in
emergency situations. The steam then condenses and reduces pressure in the
reactor system.
The pressure in the pool was seen to decrease from three atmospheres to one
atmosphere after the noise, suggesting possible damage. Radiation levels on
the edge of the plant compound briefly spiked at 8217 microsieverts per hour
but later fell to about a third that.
A close watch is being kept on the radiation levels to ascertain the status
of containment. As a precaution Tokyo Electric Power Company has evacuated
all non-essential personnel from the unit. The company’s engineers continue
to pump seawater into the reactor pressure vessel, in an effort to cool it.
Prime minister Naoto Kan has requested that everyone withdraw from the ten
kilometer evacuation zone around the nuclear power plant and that people
that stay within remain indoors. He said his advice related to the overall
picture of safety developments at Fukushima Daiichi, rather than those at
any individual reactor unit.
Posted on March 15, 2011 by mitnse
Loud noises were heard at Fukushima Daiichi 2 at 6.10am this morning. A
major component beneath the reactor may be damaged.
Confirmation of loud sounds this morning came from the Nuclear and
Industrial Safety Agency (NISA). It noted that “the suppression chamber may
be damaged.” It is not clear that the sounds were explosions.
Also known as the torus, this large doughnut-shaped structure sits in the
centre of the reactor building at a lower level than the reactor. It
contains a very large body of water to which steam can be directed in
emergency situations. The steam then condenses and reduces pressure in the
reactor system.
The pressure in the pool was seen to decrease from three atmospheres to one
atmosphere after the noise, suggesting possible damage. Radiation levels on
the edge of the plant compound briefly spiked at 8217 microsieverts per hour
but later fell to about a third that.
A close watch is being kept on the radiation levels to ascertain the status
of containment. As a precaution Tokyo Electric Power Company has evacuated
all non-essential personnel from the unit. The company’s engineers continue
to pump seawater into the reactor pressure vessel, in an effort to cool it.
Prime minister Naoto Kan has requested that everyone withdraw from the ten
kilometer evacuation zone around the nuclear power plant and that people
that stay within remain indoors. He said his advice related to the overall
picture of safety developments at Fukushima Daiichi, rather than those at
any individual reactor unit.
