Overexposure to Worker

Print View Posted on: 16 July 2020

Event Date: 30 June 2020 Event Type: Radiation Source
Event Location: United States of America, Alvin, Texas / Ineos Oligomers Chocolate Bayou INES Rating: 2 (Provisional)

The State of Texas reported that as a result of the failure of a fixed gauge on June 30, 2020, a worker likely received a dose exceeding 250 mSv (25 rem). The rotary element and the source tube came partially out of the gauge and while employees tried to put them back in, the source and the cover plate holding it came out of the source tube. Workers thought the 3.5 GBq (95 mCi) Cs-137 source was still in the gauge housing and picked up the pieces without knowing that one of the pieces was the source. One worker put the source into his shirt pocket. The licensee is conducting a re-enactment to collect information for dose reconstruction and calculation. The Radiation Emergency Assistance Center/Training Site (REAC/TS) has been contacted for biodosimetry. The preliminary estimate of the dose received exceeds the U.S. statutory limit for total effective dose equivalent. NRC EN54706

INES Rating: 2 - Incident (Provisional) as per 16 July 2020
Release beyond authorized limits? No
Overexposure of a member of the public? No
Overexposure of a worker? Yes

Contamination spread within the facility? No
Damage to radiological barriers (incl. fuel damage) within the facility? No

Degradation of Defence In-Depth No

Person injured physically or casualty? No
Is there a continuing problem? No

Patricia Milligan
Nuclear Regulatory Commission (NRC)

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