WEST HILLS, Calif.—Her gray SUV packed and a fire-proof bag ready, Melissa Bumstead didn’t waste any time Monday as plumes of smoke engulfed the sky near her suburb.

Most neighbors in West Hills—about 30 miles west of downtown Los Angeles—stayed put after only a voluntary “evacuation warning” was issued for the area. But not her.

As the ever-growing Sandy Fire swept across Southern California, the 45-year-old mother could only think of one thing. Bumstead lives less than four miles from the site of possibly the worst nuclear meltdown in U.S. history besides the Three Mile Island accident.

Melissa Bumstead voluntarily evacuated with her family from West Hills on Monday. Credit: Steven Rodas/Inside Climate News

The Santa Susana Field Laboratory, or SSFL, is known locally as a problem site—with a pockmarked history amid a spotty cleanup. A blaze hitting the former nuclear reactor and rocket testing site, Bumstead is sure, would be a cataclysm.