ENS 46526

v t e ENS Event
19:00 Jan 8, 2011
Title	Technical Specification Required Shutdown Due to Partial Closure of Letdown Line Isolation Valve 1Hp-5
Event Description	At 1400 on Saturday, January 8, 2011, Oconee Unit 1 initiated a shutdown required by Technical Specification (TS) 3.6.3, 'Containment Isolation Valves.' Unit 1 experienced an unexpected partial closure of letdown line containment isolation valve 1HP-5 during Engineered Safeguards (ES) Channel 2 on-line testing. 1HP-5 reopened when power was restored. Unit 1 entered TS 3.6.3, CONDITION A at 0148 on 1/8/11. Unit 1 entered TS 3.6.3, CONDITION D at 0548 on 1/8/11. TS 3.6.3, CONDITION D requires Unit 1 to be in mode 3 by 1748 on 1/8/11, and in mode 5 by 1748 on 1/9/11. An updated notification will be provided if the TS CONDITION is exited prior to Unit 1 reaching mode 5. An investigation is in progress to determine the cause of the unexpected partial closure of 1HP-5. All safety systems required for safe shutdown are operable and the electrical lineup is normal. The licensee is evaluating any potential impact of this event on Unit 2 and Unit 3. There is no estimate for the completion of the investigation at this time. The NRC Resident Inspector has been notified.

ENS 46526 +/-
Where
Oconee South Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
LER:	05000269/LER-2011-002 For Oconee Nuclear Station Regarding Completion of a Shutdown Required by Technical Specifications for an Inoperable Containment Isolation Valve
Time - Person (Reporting Time:+-1.9 h-0.0792 days <br />-0.0113 weeks <br />-0.0026 months <br />)
Opened:	Bob Meixell 17:06 Jan 8, 2011
NRC Officer:	Joe O'Hara
Last Updated:	Jan 8, 2011
46526 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
Oconee with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2013-11-11T10:20:00 [Table view]
[ENS list for Oconee]

Navigation menu