ENS 44171

v t e ENS Event
02:10 Apr 26, 2008
Title	Non-Isolable Rcs Boundary Leakage from Instrument Line
Event Description	On April 25, 2008, DC Cook Unit 1 was in Mode 4 heating up the RCS after a refueling outage. Personnel were performing a containment walkdown, with the RCS at 1000 psig, looking for leakage. Wisps of steam were seen coming from a 3/4 inch RCS flow instrument line weld, between the RCS loop piping and the instrument isolation valve. The leakage is less than 0.1 gpm. The leakage can not be isolated from the RCS and has been declared to be RCS Pressure Boundary Leakage. Entry into the RCS Operational Leakage Technical Specification, 3.4.13, was made at 2210 on April 25, 2008. This Technical Specification requires being in Mode 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The plant is cooling down and depressurizing as required by Technical Specifications. The plant is currently evaluating the appropriate repair method for this condition. The licensee notified the NRC Resident Inspector.

ENS 44171 +/-
Where
Cook Michigan (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
LER:	05000315/LER-2008-004 Re Non-Isolable Reactor Coolant System Pressure Boundary Leak
Time - Person (Reporting Time:+3.02 h0.126 days <br />0.018 weeks <br />0.00414 months <br />)
Opened:	Dean Bruck 05:11 Apr 26, 2008
NRC Officer:	Howie Crouch
Last Updated:	Apr 26, 2008
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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]
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