The U.S. Army Corps of Engineers has awarded a $12,973,090 contract to Andritz Hydro for generator rewinds and turbine cavitation repairs at the 810-MW Lower Monumental hydroelectric plant in Washington.
The Corps' Walla Walla District most recently sought bids for the work in May.
The Corps said generator Unit 1 experienced a runner hub linkage failure, prompting the Corps to weld blocks to the hub to hold the blades in a fixed position. The work will replace internal hub linkage components requiring disassembly of the main unit and turbine runner, with a provision to inspect and refurbish other turbine and generator components.
Repairs include cavitation repair to Unit 1 blades, hub and discharge ring as well as repair of cavitation damage to the Unit 2 runner. Andritz will supply a new stator winding and stator core.
Lower Monumental is located on the Snake River. The district took bids last year to refurbish thrust bearing shoes at Lower Monumental and 603-MW Ice Harbor dams. The Portland District called for bids by May 15 to install digital governors at Lower Monumental and eight other hydro projects.
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