ENS 52269
ENS Event | |
|---|---|
04:00 Sep 28, 2016 | |
| Title | Part 21 Report Regarding Pipe Spool Flanges for Vogtle Unit 3 |
| Event Description | The following was excerpted from an email received from WECTEC LLC:
Nature of the defect or failure to comply and the safety hazard which is created or could be created by such defect or failure to comply. The two flanges identified with deviations on Passive Core Cooling System pipe spools for the Vogtle Unit 3 AP1000r project had incorrect raised-face dimensions. This appears to have been caused by the two flanges being transposed due to an inadvertent fabrication error that occurred at the pipe spool supplier's facilities (CB&I Laurens). The error was subsequently discovered after delivery to the fabrication facility (Aecon Industrial). This error resulted in conditions where the two flanged connections would not have met the design configuration. If the flanged connections had been assembled in the delivered configuration, it is not known if system integrity and operability would have been maintained during operation. The incorrect configuration could have also led to subsequent failure after installation and operation. Hydrostatic testing of these connections is required, but had not yet been performed because the condition was discovered prior to the assembly and testing of these portions of the system. The condition is being corrected prior to the performance of that hydrostatic testing, therefore it is not known if the flanges in the incorrect configuration would have been able to pass hydrostatic testing. Due to the possibility that system integrity and operability could have been impacted by the use of the incorrect flanges, it has been conservatively concluded that this condition should be reported under 10 CFR Part 21. This conservative conclusion is based on the possibility that the Passive Core Cooling System could have been adversely impacted by the identified deviations, if the deviations had been left uncorrected. The corrective action which has been, is being, or will be taken; the name of the individual or organization responsible for the action; and the length of time that has been or will be taken to complete the action. . . . The flange configuration was corrected and the Q223 Mechanical Module was delivered to the Vogtle Unit 3 site on September 23, 2016. A corrective action report has been entered into the Westinghouse/WECTEC system to further evaluate the circumstances that led to the identified deviations.
WECTEC LLC determined that additional pipe spools with incorrect flange configurations were fabricated for V.C. Summer Unit 3 and Vogtle Unit 4. None of the pipe spools were installed in either of the facilities. Corrective actions have been taken to prevent re-occurrence. Notified R2DO (Ehrhardt) and Part 21 group via email. |
| Where | |
|---|---|
| Cb&I Laurens Charlotte, North Carolina (NRC Region 1) | |
| Organization: | Wectec Llc |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+10.95 h0.456 days <br />0.0652 weeks <br />0.015 months <br />) | |
| Opened: | Curtis Castell 14:57 Sep 28, 2016 |
| NRC Officer: | Vince Klco |
| Last Updated: | Mar 15, 2017 |
| 52269 - NRC Website | |
Cb&I Laurens with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 525222017-01-31T05:00:00031 January 2017 05:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Piping Spool Weld Nonconformance ENS 522692016-09-28T04:00:00028 September 2016 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report Regarding Pipe Spool Flanges for Vogtle Unit 3 ENS 517042016-02-01T05:00:0001 February 2016 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report Regarding Deviations of Pipe Spools for Ap1000 Projects ENS 489792013-04-29T04:00:00029 April 2013 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Basic Component Which Fails to Comply or Contains a Defect 2017-01-31T05:00:00 | |