Panorama of the Diablo Canyon Coast Line

The Diablo Canyon Independent Safety Committee (DCISC) is a three-person Committee charged with reviewing and making recommendations concerning the safety of operations at Pacific Gas and Electric Company’s (PG&E) Diablo Canyon Nuclear Power Plant (DCPP).

The Committee was created by the State of California's Public Utilities Commission (CPUC) and held its first meeting in May 1990.

The Diablo Canyon Power Plant is located on a 750-acre site along the central California coastline in San Luis Obispo County.

Diablo Canyon provides electricity for more than two million northern and central Californians from operation of its two 1,100 megawatt Westinghouse 4-loop pressurized water reactors fueled by uranium dioxide. Diablo Canyon began commercial operation in 1985 and is licensed by the U.S. Nuclear Regulatory Commission (NRC) to continue operating Unit-1 until 2024 and Unit-2 until 2025.

The Committee holds public meetings and plant tours, conducts inspections and publishes an annual report on the safety of Diablo Canyon, assisted by technical consultants and legal counsel.

The Committee at its February 2020 public meeting considered the matter of a role for the DCISC to continue to review nuclear fuel-related issues after the expiration of the operating licenses for Diablo Canyon Power Plant Unit 1 by 2024 and Unit 2 by 2025. At that meeting the Committee approved a proposed revision of the 2007 Restated Charter. The following materials are provided in connection with that matter.

  1. Present Restated Charter for the Diablo Canyon Independent Safety Committee issued on January 25, 2007 by the California Public Utilities Commission in its Decision 07-01-028
  2. Second (Proposed) Restatement of the Committee’s present charter which if submitted to and approved by the California Public Utilities Commission would provide for the DCISC’s continued review of Diablo Canyon nuclear fuel-related operations until such time as all nuclear fuel is successfully transferred to the Independent Spent Fuel Storage Installation; and
  3. A Post-shutdown Summary of the phases which will follow the shutdown of the Diablo Canyon reactors, the topical areas proposed for the DCISC’s continued review, an assessment of the risk during each phase, and an estimate of the duration of each phase (PDF).

28th Annual Report on the Safety of the Diablo Canyon Power Plant (DCPP)

Review of Decommissioning-related Issues

Review of Seismic Safety Issues

Review of Tsunami Hazard and Risk at DCPP and Its Environs

Evaluations of Safety Issues for Alternate Cooling Technologies or Modification to DCPP Once-Through Cooling System

Information on CA Public Utilities Commission Decision D.18-01-022 to Retire Diablo Canyon Power Plant (DCPP) at the Expiration of the Current Operating Licenses

DCISC Recommendations 2000–2001 to 2015–2016 Annual Report Periods

Used Fuel Storage Program Video

Diablo Canyon Nuclear Power Plant Informational Video

Steam Generator Replacement Video



For more information about DCISC contact:

Diablo Canyon Independent Safety Committee
& Office of the Legal Counsel
857 Cass Street, Suite D, Monterey, California 93940
Telephone: in Califonia call 800-439-4688; outside of California call 831-647-1044
Send E-mail to: dcsafety@dcisc.org