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Between December 30, 2005, and January 19, … Between December 30, 2005, and January 19, 2006, each unit at Quad Cities Nuclear Power Station was shut down twice to inspect and/or repair Main Steam Line (MSL) Electromatic Relief Valve (ERV) actuators. The actuator damage was caused by MSL vibration levels that exceeded the design capabilities of the components during operation at Extended Power Uprate (EPU) power levels. The root cause was failure to correct the source of the MSL vibrations identified soon after original startup of the plant.</br></br>The safety significance of this issue was minimal. The eight MSL Safety Valves and the Target Rock Safety/Relief Valve were not affected by this issue, and remained operable throughout these events. Additionally, for the most limiting case two ERVs were available.</br></br>and Unit 2. Subsequent testing has shown that overall MSL vibrations have been reduced to a level to support safe and reliable operation of the MSLs and attached components during future operating cycles at EPU.nts during future operating cycles at EPU. +
Between December 30, 2005, and January 19, … Between December 30, 2005, and January 19, 2006, each unit at Quad Cities Nuclear Power Station was shut down twice to inspect and/or repair Main Steam Line (MSL) Electromatic Relief Valve (ERV) actuators. The actuator damage was caused by MSL vibration levels that exceeded the design capabilities of the components during operation at Extended Power Uprate (EPU) power levels. The root cause was failure to correct the source of the MSL vibrations identified soon after original startup of the plant.</br></br>The safety significance of this issue was minimal. The eight MSL Safety Valves and the Target Rock Safety/Relief Valve were not affected by this issue, and remained operable throughout these events. Additionally, for the most limiting case two ERVs were available.</br></br>and Unit 2. Subsequent testing has shown that overall MSL vibrations have been reduced to a level to support safe and reliable operation of the MSLs and attached components during future operating cycles at EPU.nts during future operating cycles at EPU. +
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15:10:43, 27 November 2017 +
Main Steam Relief Valve Actuator Degradation Due to Failure to Correct Vibration Levels Exceeding Equipment Design Capacities +
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