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Nuclear Event | Reactor Manual Shutdown – Degraded Condition: Susquehanna Nuclear Power Plant, Pennsylvania

2016/06/07

Technological Hazard – Nuclear Event: Reactor Shutdown

North America – USA | State of Pennsylvania, Berwick – Susquehanna Nuclear Power Plant
Location: 41°05’20.0″N 76°08’56.0″W
Present Operational Age: ~34 years
Event: PLANT S/D REQD BY TS – DEGRADED CONDITION

 "Risk" area around the Susquehanna Steam Electric Station (SSES),

“Risk” area around the Susquehanna Steam Electric Station (SSES), a nuclear power generating facility, located near Berwick, PA. Image source: http://www.nuangola.com/locgov/ema.htm

Nuclear Event in USA on Monday, 06 June, 2016 at 05:56 [EDT].

ISOLABLE LEAKAGE IDENTIFIED FROM SEAL WATER LINE WELD INSIDE RCS PRESSURE BOUNDARY

“Susquehanna Unit 1 commenced a manual shutdown on 06/05/2016 for a maintenance outage. At 2202 hours [EDT] on 06/05/2016, operators began reducing power in accordance with plant procedures. At 0352 hours on 06/06/2016, the Main Turbine was tripped with reactor power at approximately 15%.

“The Mode switch was taken to ‘STARTUP/HOT STANDBY’ (Mode 2) at 0515 hours on 06/06/2016. Manual insertion of control rods was paused as scheduled for entry into the drywell for inspections. There were no ESF actuations.

“At 0556, the licensee identified leakage from a weld on seal water line piping connected to the 1B reactor recirculation pump seal area. The location is within the reactor recirculation loop isolation valves, therefore is isolable from the reactor vessel. The piping is ASME Class 2 and is reactor coolant pressure boundary. The reactor was in Mode 2 at the time of discovery.

“This event is being reported as a plant shutdown required by technical specifications pursuant to 10CFR50.72(b)(2)(i) and degraded condition pursuant to 10CFR50.72(b)(3)(ii)(A).

“Activities are continuing to achieve cold shutdown.”

The licensee informed the Commonwealth of Pennsylvania and the NRC Resident Inspector.

Source: NRC  Event Number:  51983


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Nuclear Event in USA on Friday, 13 May, 2016 at 01:10 [EDT]. MANUAL REACTOR SCRAM DUE AFTER LOSS OF AN ESSENTIAL MOTOR CONTROL CENTER

Nuclear Event in USA on Wednesday, 06 April, 2016 at 13:37 [EDT] REACTOR BUILDING AIRLOCK DOORS OPENED SIMULTANEOUSLY

Nuclear Event in USA on Tuesday, 29 March, 2016 at 22:56 [EDT] LOSS OF SECONDARY CONTAINMENT DIFFERENTIAL PRESSURE

Nuclear Event in USA on Wednesday, 02 March, 2016 at 13:30 [EST]. SECONDARY CONTAINMENT INOPERABLE

Nuclear Event in USA on Sunday, 06 December, 2015 at 03:50 [EST]. LOSS OF SECONDARY CONTAINMENT DIFFERENTIAL PRESSURE DUE TO ICING OF INTAKE SUPPLY PLENUM SCREENS

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