ENS 47452
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ENS Event | |
|---|---|
18:45 Nov 17, 2011 | |
| Title | Unanalyzed Condition on Startup Following Maintenance Outage |
| Event Description | On November 17, 2011, at 1345 Eastern Standard Time (EST), it was determined that an unanalyzed condition that significantly degraded plant safety existed on Unit 2 following a mid-cycle maintenance outage which required reactor vessel disassembly. Unit 2 had reached Mode 2 (i.e., Startup) during the power ascension, when elevated drywell leakage was identified and the plant was shutdown (see EN#47444). Unit 2 was subsequently operating in Mode 4 (i.e., Cold Shutdown) to allow for drywell entry. During leak investigation activities, it was determined that the reactor pressure vessel (RPV) head was not fully tensioned. This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B) as a condition of the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety.
The safety significance of this event was minimal. Unit 2 was in power ascension operating at a maximum of approximately 7% of rated thermal power. Control Room Operators took appropriate action to shutdown the Unit when elevated drywell leakage was identified. The NRC Senior Resident Inspector has been notified. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-1.78 h-0.0742 days <br />-0.0106 weeks <br />-0.00244 months <br />) | |
| Opened: | Lee Goldstein 16:58 Nov 17, 2011 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Nov 17, 2011 |
| 47452 - NRC Website
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WEEKMONTHYEARENS 499352014-03-20T13:11:00020 March 2014 13:11:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire-Related Unanalyzed Condition That Could Impact Credited Safe Shutdown Analysis ENS 492222013-07-29T14:42:00029 July 2013 14:42:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire Related Unanalyzed Condition That Could Impact Credited Safe Shutdown Analysis ENS 482532012-08-30T01:34:00030 August 2012 01:34:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Local Control Capability of Emergency Diesel Generator #2 Not Available Under Certain Conditions ENS 474522011-11-17T18:45:00017 November 2011 18:45:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition on Startup Following Maintenance Outage ENS 473412011-10-13T14:00:00013 October 2011 14:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire Related Unanalyzed Condition That Could Impact Equipment Credited in Safe Shutdown Analysis ENS 444252008-08-19T15:10:00019 August 2008 15:10:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Alternate Safe Shutdown Local Start Capability of All Four Emergency Diesel Generators May Not Be Available Under Certain Conditions ENS 411602004-10-29T20:00:00029 October 2004 20:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Discovered in 480 Volt Switchgear Room 2014-03-20T13:11:00 | |
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