The San Diego County Board of Supervisors Tuesday unanimously approved a proposal to pursue partnerships with national laboratories on resolving issues with spent nuclear fuel stored at the closed San Onofre plant.

The motion by Supervisor Jim Desmond directs county staff to bring back partnership and policy options within 90 days, including any possible costs and potential funding sources.

The plan also calls on the county to work with such entities as Southern California Edison, the U.S. Nuclear Regulatory Commission and Department of Energy.

Located in northwest San Diego County near the Orange County border, the San Onofre Nuclear Generating Station was operated for 45 years, starting in 1968.

It went offline in June 2013 "due to excessive vibrations and other issues that degraded

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