Three workers at the Savannah River Site near Augusta were injured after they were exposed to nitric acid.
The workers were preparing to remove piping at the site when they were exposed to the chemical.
It happened at a part of the site that once processed plutonium. Workers are deactivating the site, know as F Area or F Canyon.
The three were treated at a burn center in Augusta. Two were discharged and one remained there this afternoon with burns to his arm, according to a spokesman with the Savannah River Site.
Medical personnel evaluated four others at the site.
A spokesman at the site says no radioactivity was detected at the accident site.