It does no good to freak out if you find chometz, if you believed your declaration of it as dust of the earth before Pesach. Once we found some in a plastic bag (#10, which we knew was lurking somewhere), and our rav told us to carefully flush it, and throw the plastic bag out outside. Not our chometz…
OTOH, I’m 50.1 miles from a nuclear power plant, and if something goes wrong, I’m grabbing the kids out of school and meeting my husband somewhere in the midwest.