Diablo Canyon runs alone

With the announcement of the shutdown of San Onofre Units 2 and 3, the two units at the Diablo Canyon Nuclear Power Plant are the last operating nuclear power units in California. SONGS 2 and 3 join San Onofre Unit 1 and Rancho Seco near Sacramento as well as the early 65 MWe Humboldt Bay Unit 3 reactor in Eureka as shut down power reactors in California.

Diablo Canyon is set in a dramatic site on the Pacific Coast near San Luis Obispo. The plant has had its own controversies, including a hotly contested licensing proceeding that focused on the seismic design of the facility and a suspension of the initial operating license in the face of the discovery quality assurance errors. Diablo Canyon has been a prime focus of the anti-nuclear movement, led by the San Luis Obispo Mothers for Peace. Despite challenges, both units were licensed and survived judicial review and have had a generally good operating record.

Pacific Gas and Electric co. has filed for renewal of the Diablo Canyon licenses, but asked for deferral of the final NRC decision on the renewal application pending the outcome of further seismic studies in part being pursued to placate demands from the State of California.

Time will tell whether Diablo Canyon will negotiate the political as well as technical hurdles toward license renewal.