Turbine cracking caused Sherco 3 shutdown

摘要

Northern States Power on Oct. 21 submitted a long-promised Root Cause Analysis Report to the Minnesota Public Utilities Commission about the primary cause of the catastrophic outage that occurred in November 2011 at the coal-fired Sherburne County Unit 3 (Sherco 3). Nearly two years of Sherco 3 restoration work has been completed and the repaired unit was synchronized to the electric grid on Sept. 4, taken off-line days later to address post-restoration items and returned again to service Oct. 10, with testing continuing at various load levels.