Carter toured the plant April 1, 1979, to prove it was safe.
President Jimmy Carter and others tour the Three MIle Island nuclear power plant in Pennsylvania on April 1, 1979. The yellow booties were worn to prevent them from carrying potentially contaminated particles out of the plant.
https://www.gannett-cdn.com/media/2017/02/13/TennGroup/Knoxville/636225990455474799-howard4.jpg
https://www.usatoday.com/story/news/nation-now/2017/02/15/harold-denton-three-mile-island-hero-dies/97973676/