Accident Investigation of the May 25, 2023, Ironworker Fall Injury at the Fermi National Accelerator Laboratory Proton Improvement Plan – II Construction Project

On May 25, 2023, during construction at the Proton Improvement Plan–II (PIP-II) project site at the Fermi National Accelerator Laboratory (FNAL), ironworkers were preparing to attach a rebar template to the side of a form wall.

Office of Environment, Health, Safety & Security

May 25, 2023
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On May 25, 2023, during construction at the Proton Improvement Plan–II (PIP-II) project site at the Fermi National Accelerator Laboratory (FNAL), ironworkers were preparing to attach a rebar template to the side of a form wall. During this task, an ironworker positioned near the top of the form wall fell approximately 23 feet, striking a diagonal brace before landing on the concrete slab below, sustaining serious injuries, including head trauma.

The Board’s responsibilities have been completed with respect to this investigation. The analysis and the identification of the direct cause, contributing causes, root cause, and the Judgments of Need resulting from this investigation were performed in accordance with Department of Energy Order 225.1B, Accident Investigations, dated 3/4/2011.