A Diablo Canyon nuclear power plant warning siren in San Luis Obispo.
A Diablo Canyon nuclear power plant warning siren in San Luis Obispo.
A Diablo Canyon nuclear power plant warning siren in San Luis Obispo.

Diablo emergency warning sirens to undergo regular tests this week

April 01, 2013 09:51 AM

UPDATED April 02, 2014 10:34 AM