ENS 43880
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ENS Event | |
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07:50 Jan 4, 2008 | |
Title | Pressure Boundary Leakage Discovered During Refueling |
Event Description | While in Mode 6 with the Reactor Head in place and fuel in the Reactor Vessel, weld overlay was in progress on the common Decay Heat Suction line from the Reactor Coolant System. The Reactor Coolant System is in a drained condition with RCS level approximately 24 inches above the Hot Leg Centerline. During the first weld pass on the suction line weld located in Containment, the welding operator noticed water seeping from the weld. Visual inspection revealed a small leak. The leakage is too small to quantify the leakrate. Surface examinations prior to welding revealed no abnormal conditions or leakage. Welding operations on this weld have been suspended. Planned Refueling activities continue to defuel the reactor vessel.
One train of Decay Heat Removal remains in service providing core cooling. The second train is aligned in standby for Decay Heat Removal. Both Trains of Decay Heat Removal have been declared inoperable due to this leak, however both trains of Decay Heat Removal remain functional. The licensee notified the NRC Resident Inspector. |
Where | |
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Davis Besse Ohio (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
LER: | 05000346/LER-2008-001 |
Time - Person (Reporting Time:+0.25 h0.0104 days <br />0.00149 weeks <br />3.4245e-4 months <br />) | |
Opened: | Anthony Stallard 08:05 Jan 4, 2008 |
NRC Officer: | Jason Kozal |
Last Updated: | Jan 4, 2008 |
43880 - NRC Website
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WEEKMONTHYEARENS 518372016-03-30T21:15:00030 March 2016 21:15:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition Due to Discovery of Pressure Boundary Leakage ENS 491632013-07-01T15:03:0001 July 2013 15:03:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition Due to Rcp Seal Line Pressure Boundary Leakage ENS 480002012-06-06T23:56:0006 June 2012 23:56:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition Due to Discovery of Pressure Boundary Leakage ENS 457642010-03-13T02:43:00013 March 2010 02:43:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Control Rod Drive Mechanism Nozzle Indications ENS 438802008-01-04T07:50:0004 January 2008 07:50:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Pressure Boundary Leakage Discovered During Refueling ENS 424372006-03-21T21:08:00021 March 2006 21:08:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition - Indication on Primary Coolant System Pressure Boundary Weld 2016-03-30T21:15:00 | |
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