[Description of the
Accident]
During work to remove
soybeans adhering to the inner surface of the silo in a cooling oil plant,
the victim absorbed methyl bromide, a chemical that is used for grain
fumigation, and was fatally poisoned.
On the day of accident, work
to clean the silo was started around 8:40 AM by a group of workers
consisting of the section chief for silo operations, staff of a
maintenance company, and the victim who was a temporary
worker.
Shortly after the victim started work inside the silo, the
section chief became uneasy about not having measured the methyl bromide
concentration in the silo, which is prescribed in the cleaning manual. He
therefore fetched a gas densimeter for this purpose from the staff room of
the fumigation company. When he measured the gas concentration at the
location of the valve in the lower section of the silo, the meter
indicated a reading of 515 ppm.
As he feared that the inside of the
silo posed a danger as well, he immediately returned to the top of the
silo and raised the gondola in which the victim was working, only to find
that the victim was already semiconscious. While the victim recovered
consciousness after being taken to the hospital, his condition worsened
again and he died that night.
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