On Monday, Southern California Edison announced it had formalized a
request to amend its operating license to allow it to operate its
Unit 2 reactor at 70 percent beginning June 1.
The reactor was undergoing scheduled maintenance in January 2012
when a small, non-injury leak was discovered in plant’s other
reactor. The plant has been shut down since.
According to Edison, vibrations that led to premature wearing of
steam pressure tubes in the reactors don’t occur at 70 percent
power. The utility wants to operate on limited power for the five
warm weather months and then shut down for an inspection of the
After the inspection, the reactor would resume operating at 70
percent power. The company said it would use the collected tube data
to determine an appropriate power setting for the long term.
WASHINGTON—March 8—A secret Mitsubishi Heavy Industries
report released today confirms that Southern California Edison knew
about serious problems in the radically redesigned replacement steam
generators for the San Onofre nuclear reactors years before the
defective equipment was installed, yet failed to make changes to fix
the problems. The report was released today by the Nuclear
Regulatory Commission after Senator Barbara Boxer (D-Calif.) and
Representative Edward Markey (D-Mass.) revealed its existence and
demanded it be made public.