The San Onofre Nuclear Power Plant is seen on April 6, 2012.
San Onofre is twisting in the breeze of the new Fairewinds safety report released by activist group Friends of the Earth.
The study raises serious doubts about safety at the Southern California nuclear facility, and says running at reduced power will not solve the tubing trouble that has plagued the plant.
Southern California Edison recently disclosed a tentative plan to run the twin reactors at an unspecified lower power, at least for several months.
Engineers believed reduced power would ease the vibration causing the unusual deterioration of tubes inside the steam generators.
The Fairewinds report, however, says running at reduced power may actually make the damage worse and increase the possibility of cascading safety failures.
The report also expands a previous allegation that Edison misled federal regulators about modifications to the generators. The Nuclear Regulatory Commission (NRC) disputes that claim.