On Friday January 27, San Luis Obispo Mothers for Peace (SLOMFP) through Ojai-based attorney Sabrina Venskus submitted expert testimony to the California Public Utilities Commission (CPUC) showing that Diablo Canyon should be closed in 2019, not 2024, because it is becoming unsafe and unreliable. One of two expert witnesses for SLOMFP is David D. Jackson, Department of Earth, Planetary, and Space Sciences at UCLA.


In his testimony Dr. Jackson explains the many types of seismic damage to the plant in case of an earthquake. Among his assertions is that the substantial risk of earthquakes at Diablo Canyon nuclear plant has been underestimated, and that the seismic studies relied upon evaluate only a part of the risk which affects any decision of how long to continue operation of the two Diablo Canyon reactors.

Among Dr. Jackson’s criticisms of the seismic studies published by PG&E in 2015 is that, “Uncertainties of the fault location from the small earthquake data allow the possibility that the Shoreline Fault actually lies directly beneath DCNPP.”

Dr. Jackson’s nine pages of testimony are available at https://mothersforpeace.org/data/2017/2017-1-27-testimony-of-david-d-jackson-on-seismic-risks-related-to-closure-date-of-diablo-canyon

SLOMFP is commenting as a party to the California Public Utilities Commission’s proceedings on the Joint Proposal reached in June of 2016 between PG&E and several environmental groups and unions. SLOMFP has also submitted expert testimony to the CPUC by nuclear engineer Arnie Gundersen. His testimony is available at https://mothersforpeace.org/data/2017/31-1-17-arnie-gundersens-testimony-to-the-cpuc/view

In addition, SLOMFP has joined with Women’s Energy Matters of Marin County regarding timing and costs of replacing the needed power at Diablo Canyon with renewable energy, using the testimony of energy analyst Robert Freehling. SLOMFP compiled documents regarding the environmental effects of Once-Through Cooling on aquatic life around the facility. By co-sponsoring a portion of the testimony by the Alliance for Nuclear Responsibility’s attorney Al Pak, SLOMFP is objecting to PG&E’s request to recover the costs of its relicensing application filed with the Nuclear Regulatory Commission in 2009, but later withdrawn.