FILE - In this Nov. 3, 2008 file photo, Pacific Gas and Electric's Diablo Canyon Power Plant's nuclear reactors are seen in Avila Beach, Calif. State and federal officials are juggling concerns over endangered whales and other marine life with public safety as they mull over plans to use massive air canons to create new earthquake fault maps in two state marine reserves off the Central Coast. Pacific Gas & Electric Co. wants to use the canons to make maps of shoreline fault zones recently discovered near its Diablo Canyon nuclear power plant. (AP Photo/Michael A. Mariant, File)

Associated Press
FILE - In this Nov. 3, 2008 file photo, Pacific Gas and Electric's Diablo Canyon Power Plant's nuclear reactors are seen in Avila Beach, Calif. State and federal officials are juggling concerns over endangered whales and other marine life with public safety as they mull over plans to use massive air canons to create new earthquake fault maps in two state marine reserves off the Central Coast. Pacific Gas & Electric Co. wants to use the canons to make maps of shoreline fault zones recently discovered near its Diablo Canyon nuclear power plant. (AP Photo/Michael A. Mariant, File)
FILE - In this Nov. 3, 2008 file photo, Pacific Gas and Electric's Diablo Canyon Power Plant's nuclear reactors are seen in Avila Beach, Calif. State and federal officials are juggling concerns over endangered whales and other marine life with public safety as they mull over plans to use massive air canons to create new earthquake fault maps in two state marine reserves off the Central Coast. Pacific Gas & Electric Co. wants to use the canons to make maps of shoreline fault zones recently discovered near its Diablo Canyon nuclear power plant. (AP Photo/Michael A. Mariant, File)
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