ENS 48435
ENS Event | |
|---|---|
23:22 Oct 23, 2012 | |
| Title | Degraded Condition Due To Reactor Head Vessel Penetration Indications |
| Event Description | On October 23, 2012, V. C. Summer Station Unit 1 (VCSNS) identified two reactor vessel head penetrations (19 and 52) that did not meet the requirements of 10CFR50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1. The station is in a refueling outage (RF20) and the plant is currently shutdown and in Mode 6. The reactor vessel head (RVH) contains a total of 66 penetrations and inspection efforts are approximately 50% percent complete. There have been no previous repairs to the reactor vessel head penetrations and/or j-groove welds. The indications are not through wall as indicated by volumetric and bare metal visual inspections. The penetrations will be repaired to meet the requirements of 10CFR50.55a prior to returning the vessel head to service.
The inspection results are reportable pursuant to 10CFR50.72(b)(3)(ii)(A). The NRC Resident Inspector has been notified. The licensee will notify the State of South Carolina and local counties.
On October 25, 2012, V. C. Summer Station Unit 1 (VCSNS) finalized our inspections of the reactor vessel head, which has identified a total of four reactor vessel head penetrations (19, 52, 31, and 37) that did not meet the requirements of 10CFR50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1. The station is in a refueling outage (RF20) and the plant is currently shutdown and defueled. The indications are not through wall as indicated from volumetric and bare metal visual inspections. The penetrations will be repaired to meet the requirements of 10CFR50.55a prior to returning the vessel head to service. The inspection results are reportable pursuant to 10CFR50.72(b)(3)(ii)(A). The NRC Resident Inspector has been notified. Notified R2DO (Musser). |
| Where | |
|---|---|
Summer  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
| Time - Person (Reporting Time:+-2.38 h-0.0992 days <br />-0.0142 weeks <br />-0.00326 months <br />) | |
| Opened: | Bruce Thompson 20:59 Oct 23, 2012 |
| NRC Officer: | Vince Klco |
| Last Updated: | Oct 25, 2012 |
| 48435 - NRC Website
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WEEKMONTHYEARENS 500442014-04-19T00:39:00019 April 2014 00:39:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition Due to Reactor Head Vessel Penetration Indications ENS 484352012-10-23T23:22:00023 October 2012 23:22:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition Due to Reactor Head Vessel Penetration Indications ENS 429152006-10-17T18:15:00017 October 2006 18:15:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Pressure Boundary Leakage Identified During an Outage ENS 406282004-03-30T16:29:00030 March 2004 16:29:00 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)(3)(ii)(A), Seriously Degraded Automatic Reactor Trip Due to Lo-Lo Steam Generator Level ENS 402612003-10-20T11:00:00020 October 2003 11:00:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Rcs Through-Wall Leakage Found on Seal Injection Piping 2014-04-19T00:39:00 | |