ENS 51837

v t e ENS Event
21:15 Mar 30, 2016
Title	Degraded Condition Due to Discovery of Pressure Boundary Leakage
Event Description	On March 30, 2016, at 1715 EDT, with the Unit shutdown and in Mode 6 for refueling, evidence of leakage was identified on a 3/4-inch flexible braided piping connection on Reactor Coolant Pump (RCP) 1-1, and this issue was determined to be reactor coolant system pressure boundary leakage. This flexible piping is for RCP 1-1 first stage seal cavity vent line, and is categorized as ASME Section III Class 2 piping. The leakage was identified due to the discovery of a small amount of boric acid (approximately 1/2 teaspoon) on the welded end connection of the flexible piping. No active leakage was identified at the time of discovery with the Reactor Coolant System depressurized and approximately 110 degrees F. Technical Specification (TS) Limiting Condition for Operation (LCO) 3.4.13, 'RCS Operational Leakage,' does not apply in the current plant condition (Mode 6). The cause and resolution of the leakage are under evaluation. This event is reportable within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> per 10 CFR 50.72(b)(3)(ii)(A). The NRC Resident Inspector has been notified.

ENS 51837 +/-
Where
Davis Besse Ohio (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
LER:	05000346/LER-2016-003
Time - Person (Reporting Time:+2.98 h0.124 days <br />0.0177 weeks <br />0.00408 months <br />)
Opened:	Bill Rayburn 00:14 Mar 31, 2016
NRC Officer:	Dong Park
Last Updated:	Mar 31, 2016
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v • d • e

v t e Emergency Notification System
Davis Besse with 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR2016-03-30T21:15:00 [Table view]
[ENS list for Davis Besse]

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