ENS 51983: Difference between revisions

v t e ENS Event
09:56 Jun 6, 2016
Title	Isolable Leakage Identified from Seal Water Line Weld Inside Rcs Pressure Boundary
Event Description	Susquehanna Unit 1 commenced a manual shutdown on 06/05/2016 for a maintenance outage. At 2202 hours0.0255 days <br />0.612 hours <br />0.00364 weeks <br />8.37861e-4 months <br /> [EDT] on 06/05/2016, operators began reducing power in accordance with plant procedures. At 0352 hours0.00407 days <br />0.0978 hours <br />5.820106e-4 weeks <br />1.33936e-4 months <br /> 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 hours0.00596 days <br />0.143 hours <br />8.515212e-4 weeks <br />1.959575e-4 months <br /> 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.

ENS 51983 +/-
Where
Susquehanna Pennsylvania (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
Time - Person (Reporting Time:+-1.72 h-0.0717 days <br />-0.0102 weeks <br />-0.00236 months <br />)
Opened:	Lonnie Crawford 08:13 Jun 6, 2016
NRC Officer:	Steve Sandin
Last Updated:	Jun 6, 2016
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v • d • e

v t e Emergency Notification System
Susquehanna with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR2023-03-26T20:03:00 [Table view]
[ENS list for Susquehanna]

@@ Line 16: / Line 16: @@
 | event date = 06/06/2016 05:56 EDT
 | last update date = 06/06/2016
-| title = Isolable Leakage Identified From Seal Water Line Weld Inside Rcs Pressure Boundary
+| title = Isolable Leakage Identified from Seal Water Line Weld Inside Rcs Pressure Boundary
 | event text = 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.

v t e Unit 1
GE-4
Reactor critical	Critical
Scram	No
Before	Startup (9 %)
After	Startup (8 %)

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