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Preliminary Notification (PN) Reports for 2021

| January | June | July | August | October

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October
PNO-III-22-001 10/19/2021 Dresden Nuclear Power Station, Unit 3: Unplanned Shutdown Greater Than 72 Hours and Notice of Unusual Event for a Fire Affecting the Dresden Unit 3 Main Power Transformer

August
PNO-IV-21-001A 08/19/2021 Union Electric Company/Callaway Plant: Update: Callaway Restart Following Plant Automatic Reactor Trip Due to Main Generator Fault and Shutdown Greater Than 72 Hours

July
PNO-lll-21-001A 07/09/2021 Donald C. Cook Nuclear Plant, Unit 2, Update: Unplanned Shutdown Greater Than 7 Days Due To Main Steam Leakage

June
PNO-lll-21-001 06/30/2021 Donald C. Cook Nuclear Plant, Unit 2: Unplanned Shutdown Greater Than 7 Days Due To Main Steam Leakage

January
PNO-IV-21-001 01/19/2021 Union Electric Company/Callaway Plant: Update: Callawy Plant Automatic Reactor Trip due to Main Generator Fault, and Shutdown Greater than 72 Hours

Page Last Reviewed/Updated Tuesday, September 08, 2026