ENS 46526
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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. |
| Where | |
|---|---|
Oconee  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| 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
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 495272013-11-11T10:20:00011 November 2013 10:20:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Unit 1 Commenced a Technical Specification Required Shutdown Due to Rcs Leakage ENS 465262011-01-08T19:00:0008 January 2011 19:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Partial Closure of Letdown Line Isolation Valve 1Hp-5 ENS 419662005-08-31T18:28:00031 August 2005 18:28:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Unit 3 Experienced an Automatic Reactor Trip During Routine Testing ENS 414022005-02-11T04:00:00011 February 2005 04:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Loss of Electrical Power Sources ENS 409022004-07-28T12:00:00028 July 2004 12:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Plant Shutdown Required by Technical Specifications ENS 404332004-01-09T00:02:0009 January 2004 00:02:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Ts Required Shutdown at Oconee 1 Due to Unidentified Rcs Leakage 2013-11-11T10:20:00 | |
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