ENS 48537

v t e ENS Event
00:30 Nov 27, 2012
Title	Degraded Condition Due to Pinhole Leak in Reactor Head Spray Line
Event Description	Pinhole leak discovered on a Reactor Head Spray line weld during Nuclear Steam Supply System Leak Test. Oyster Creek Nuclear Generating Station is currently in the Shutdown Condition executing Refueling Outage 1R24, which includes Nuclear Steam Supply System (NSSS) Leak Testing, prior to startup. At 1930 on 11/26/2012, a pinhole leak was discovered on a Reactor Head Spray Class 1 piping weld. The leak was discovered during the NSSS Leak Test, while the Reactor was in the Shutdown Condition. The leak is on a flange to piping weld on the Reactor Head Spray system upstream of the N-7B nozzle. Water was found to be weeping from the pinhole leak (approximately 2 to 3 drops per minute). The cause is under investigation and corrective action plans are being developed. The leak has been evaluated by Exelon and determined to meet the criteria for reporting identified in NUREG-1022: Welding or material defects in the primary coolant system that cannot be found acceptable under ASME Section XI, IWB-3600, 'Analytical Evaluation of Flaws,' or ASME Section XI, Table IWB-3410-1, 'Acceptable Standards.' The NRC Resident Inspector has been informed.

ENS 48537 +/-
Where
Oyster Creek New Jersey (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
Time - Person (Reporting Time:+-0.47 h-0.0196 days <br />-0.0028 weeks <br />-6.43806e-4 months <br />)
Opened:	Steve Johnston 00:02 Nov 27, 2012
NRC Officer:	Charles Teal
Last Updated:	Nov 27, 2012
48537 - NRC Website
v • d • e

v t e Emergency Notification System
Oyster Creek with 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR2012-11-07T17:40:00 [Table view]
[ENS list for Oyster Creek]

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