ENS Event | |
|---|---|
18:33 Apr 27, 2012 | |
| Title | Reactor Head Nozzle Penetration Flaws Identified |
| Event Description | On April 27, 2012, while the Harris Nuclear Plant was shutdown for a scheduled refueling outage, the reactor vessel head penetrations were being examined in accordance with Inservice Inspection Program requirements. Examinations were being performed to identify flaws before they grow to a size that could effect the structural integrity of the reactor vessel. Those examinations identified flaws in four head penetration nozzles that exhibited characteristics of Primary Water Stress Corrosion Cracking. The four nozzles were repaired using the inner diameter temper bead welding process. Examinations performed following the repairs confirmed the repairs were successful.
This was originally submitted as a voluntary report on May 29, 2012 at 1511 EDT. The condition has since been determined to be reportable per 10CFR50.72(b)(3)(ii)(A). The NRC Resident Inspector has been informed. |
| Where | |
|---|---|
Harris  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
| Time - Person (Reporting Time:+10006.15 h416.923 days <br />59.56 weeks <br />13.706 months <br />) | |
| Opened: | John Caves 16:42 Jun 18, 2013 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Jun 18, 2013 |
| 49131 - NRC Website
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WEEKMONTHYEARENS 533262018-04-11T18:30:00011 April 2018 18:30:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition Due to Indication During Ultrasonic Examination of Reactor Nozzle Penetration ENS 522972016-10-15T12:57:00015 October 2016 12:57:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Reactor Vessel Head Penetration Nozzle Flaw ENS 509622015-04-07T15:47:0007 April 2015 15:47:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Reactor Vessel Head Penetration Flaw Identified During Inservice Inspection ENS 495532013-11-18T13:00:00018 November 2013 13:00:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Ultrasonic Examination Identified Flaw in Reactor Vessel Head Penetration ENS 490382013-05-15T10:49:00015 May 2013 10:49:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Technical Specification Required Shutdown Due to Discovery of an Unacceptable Flaw During Data Review ENS 491312012-04-27T18:33:00027 April 2012 18:33:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Reactor Head Nozzle Penetration Flaws Identified 2018-04-11T18:30:00 | |