Penstock Incident Search Results


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More  Date   Initiating Event   Penstock Type  Failure Mode Description (Short ) Effect
03/25/1999Landslide Penstock buried in a mudslideMudslide 
01/01/1942DeteriorationWoodLeak in woodstave pipe due to deteriorationDeterioration/Seepage/Piping (Periodic Inspection) 
04/01/1995Penstock DischargeSteelPenstock buckling due to vacuum in the pipePenstock Buckled 
11/08/1996Inflow Flood - Hydrologic Event Erosion at the penstockFlood 
04/17/1998 Riveted SteelRiveted steel penstock rupturedA section of the original riveted steel of penstock No. 3 ruptured.Penstock rupture caused erosion of fill and flooding of the powerhouse. This, in turn, caused a powerhouse shutdown, release of oil into the river and knocking out a local distribution line.
07/01/1999   Seepage/Piping 
07/01/1997LightningSteelPenstock buckling and penstock rupturePenstock Failure 
06/14/1996Broken Turbine Needle Tip Penstock rupturePenstock failure; faulty needle valve caused water hammer which caused metal fatigue and failureUnit 3 offline for four weeks; some erosion and minor damage to powerhouse
03/12/2009 ConcreteLoss of support due to a void under the penstockVoid under penstock 
01/21/2010  Roof of the box conduit collapsedFailure along conduitConduit roof collapsed and filled with mud.

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