ENS Event | |
|---|---|
01:00 Oct 18, 2006 | |
| Title | Reactor Vessel Head Nozzle Weld Area Flaw |
| Event Description | During the performance of NDE examinations of the Beaver Valley Unit 2 (BV-2) reactor pressure vessel (RPV) closure head Alloy 600 Control Rod Drive Mechanism (CRDM) penetrations required by NRC Order (EA-03-009), indications were identified in penetrations #16, #56, and #61. The ultrasonic examination (UT) signal for the three (3) penetrations were in the J-groove weld area and extend into the CRDM tube base material.
Confirmatory eddy current testing (ECT) was performed on penetrations #16, #56 and #61. Liquid Penetrant (PT) examinations were performed on penetrations #56 and #61 and displayed indications that required further investigation. Following minor excavation of the weld surface in the area of the indications on both penetrations (#56 and #61), additional PT examinations were performed. The result of these examinations on 10/17/06 at 2100 confirmed the presence of flaws in the weld that do not meet acceptance criteria. Penetration #16 is in the state of discovery at this time through PT examination techniques. Based upon the preliminary analysis, it is expected that these indications would not be acceptable under ASME standards. Although this condition does not exceed the specific 10 CFR 50.72(b)(3)(ii)(A) criteria since there was no leakage as addressed in ASME Table IWB-3410-1 acceptance criteria and the component structures defined in the ASME IWB-3600 acceptance guidance do not address the J-groove weld configuration, reporting under voluntary considerations is appropriate. BV-2 is planning to repair penetrations #56 and #61. Penetration #16 will also be repaired if warranted through the discovery process. All repairs will be completed prior to returning the RPV head to service. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
| Beaver Valley Pennsylvania (NRC Region 1) | |
| Reporting | |
| Information Only | |
| Time - Person (Reporting Time:+-0.68 h-0.0283 days <br />-0.00405 weeks <br />-9.31464e-4 months <br />) | |
| Opened: | Dave Held 00:19 Oct 18, 2006 |
| NRC Officer: | Jason Kozal |
| Last Updated: | Oct 18, 2006 |
| 42917 - NRC Website
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Beaver Valley with Information Only | |
WEEKMONTHYEARENS 445972008-10-23T22:00:00023 October 2008 22:00:00
[Table view]Information Only, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Information Only Notification Regarding Plant Shutdown ENS 429172006-10-18T01:00:00018 October 2006 01:00:00 Information Only Reactor Vessel Head Nozzle Weld Area Flaw 2008-10-23T22:00:00 | |