In a post entitled NRC: ‘Diablo Canyon among ‘most embrittled plants in the U.S.,’ Mary Beth Brangan and James Heddle have posted an article at NoNukesCA.net applying the lessons learned about reactor pressure vessel (RPV) embrittlement at Diablo Canyon.
In a document dated March/April 2013 (see point #4, on p. 5 of 15 of PDF counter), the U.S. Nuclear Regulatory Commission listed Diablo Canyon Unit 1 as having one of the worst neutron radiation embrittled RPVs in the country, surpassing safety screening criteria by 2033. However, given that Palisades' own End-of-Life dates have been predicted as early as the mid-1990s, or even the early 1980s, only to be postponed to 2017, with applications for regulatory relief out to 2031, Diablo Canyon's "good to go" till 2033 NRC seal of approval must be subjected to critical scrutiny.
Pacific Gas & Electric has applied to NRC for 20-year license extensions at Diablo Canyon 1 & 2. Friends of the Earth recently won a hearing from the NRC's Atomic Safety and Licensing Board for a hearing on earthquake risks. A similar legal victory in 2013 led to the permanent closure of San Onofre 2 & 3 in southern CA.