Penstock Inspection and Safety Assessment Program, Black Canyon Dam, BoiseProject, Idaho, Review Report, Pacific Northwest Region

摘要

The penstocks at Black Canyon Dam were inspected on September 17- 18, 1996. Thefollowing tasks were performed as part of this examination: (1) The condition of the interior and linings and the exposed exterior sections and coatings of both penstocks was inspected. The exposed exterior sections and coatings of the pump penstocksm and pump discharge pipe were also examined. (2) The wall thickness of the penstocks and pump discharge pipe was determined by ultrasonic testing. (3) Appurtenances where the penstock and piping connected to the penstock change in diameter or where the water flows change in direction were inspected. (4) Joints, piping connections, and various associated operating equipment (gates, valves, etc.) were inspected. (5) A review of the emergency control system, governnor settings, and data for hydraulic transient analysis was performed. (6) Load rejections tests, an air vent analysis, and emergency gate closure tests were also performed. (7) A stress analysis was performed based on penstock wall thickness values obtained using ultrasonic techniques.