RICHLAND, Wash. (AP) — Officials say 11 workers at a nuclear facility who reported headaches were sent for medical evaluations after working near an area where waste from a leaking tank was being transferred.

The Tri-City Herald reports the first two workers at the Hanford Nuclear Reservation to be medically evaluated Thursday were wearing oxygen respirators because they were in an area where work was being done that could increase the risk of chemical vapors in the air. After leaving the area and removing the respirators, both reported suspicious odors and said they had headaches. Both were evaluated and treated at an on-site medical provider.

Two other workers reported odors while walking the transfer line for the waste pumped from the leaking double shell tank. Seven other employees nearby also reported odors.

Those workers also sought on-site medical evaluations. The results were not immediately available.

Earlier this month, officials revealed that a tank known as AY-102 had leaked several thousand gallons of radioactive waste from its primary tank.

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