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PG&E's Humboldt Bay and Diablo Canyon Power Plants Decommissioning Process

Learn about the decommissioning of Humboldt Bay Unit 3 and operations of Diablo Canyon Power Plant, including replacement power sources. Explore the history, g-load challenges, and current status of the decommissioning process.

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PG&E's Humboldt Bay and Diablo Canyon Power Plants Decommissioning Process

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  1. PG&E’s Humboldt Bay (HBPP) & Diablo Canyon (DCPP) Power PlantsDecommissioning process and replacement power April 14, 2011 Loren Sharp

  2. History of HBPP Unit 3 • Humboldt Bay Unit 3 was designed for a g load of 0.25 (considered a reasonable value in 1960) • G value exceeded in 1975 Ferndale earthquake • Plant shutdown in July 1976 for refueling and seismic upgrades • Many geotechnical evaluations performed over next four years • A 1980 report proposed 0.5 as the new g load, but this report was never accepted by NRC • Decision was made to remain in shutdown, and enter SAFSTOR and recently start decommissioning the plant • Uncertainty over what g value was going to be accepted • Expense of other safety modifications required as a result of the Three Mile Island event versus power benefit

  3. HBPP Unit 3 Decommissioning Status • Spent fuel removed from pool December 2008 • Started Systems removal May 2009 • High Pressure Turbine removed Oct 2010 • Low Pressure Turbine removed Oct 2010 • Upper Condenser Removed Nov 2010 • Lower Condenser removed Dec 2010

  4. DCPP Operation • DCPP produces approximately 18,000GWh per year of energy • With 2,200+ MW of net qualifying capacity toward PG&E’s reliability requirements • Currently, operating costs are approximately $50/MWh

  5. DCPP Replacement Power – Generation Sources • Combined Cycle Generation • Energy Efficiency • Renewable Generation • Coal-Fueled Integrated Gasification Combined Cycle and Carbon Capture and Sequestration • Combined Heat and Power Generation

  6. DCPP Replacement Power – Estimated Alternative Costs

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