ENS 48868

v t e ENS Event
08:14 Mar 31, 2013
Title	Rcs Flow Instrument Line Through Wall Weld Defect
Event Description	On 3/31/13 at 0414 EDT, dye penetrant testing identified a 10mm long relevant linear indication on a 3/4 inch RCS flow instrument line weld, between the RCS loop piping and the instrument isolation valve. This constitutes a weld defect in the primary coolant system that cannot be found acceptable per ASME Section XI. This section of piping is unisolable from the Reactor Coolant System. There is no evidence of active leakage currently or during the previous operating cycle, however, based on the dye penetrant testing this is considered a through wall leak. This event notification is being made in accordance with 10CFR50.72(b)(3)(ii)(A), as a condition that results in the condition of the nuclear power plant, including its principal safety barriers, being seriously degraded. Unit 1 is currently in a scheduled refueling outage in Mode 5 making preparations to transition to Mode 6. The plant is evaluating the appropriate repair method for this condition. The condition will be corrected during the current refueling outage. Unit 2 is in Mode 1 at 100% power and is unaffected by this condition. The NRC Resident Inspector has been notified.

ENS 48868 +/-
Where
Cook Michigan (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
Time - Person (Reporting Time:+0.9 h0.0375 days <br />0.00536 weeks <br />0.00123 months <br />)
Opened:	Gregory Kanda 09:08 Mar 31, 2013
NRC Officer:	Donald Norwood
Last Updated:	Mar 31, 2013
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v • d • e

v t e Emergency Notification System
Cook with 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR2013-03-31T08:14:00 [Table view]
[ENS list for Cook]

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