ENS 52310
ENS Event | |
|---|---|
15:26 Aug 31, 2016 | |
| Title | Westinghouse Life Line D Type Lac Induction Motor Failure |
| Event Description | The following Part 21 Report was received from the licensee via facsimile:
10 CFR Part 21 Notification - Westinghouse Life Line D Type LAC Induction Motor Model HSDP 4000V, 700hp. This is a non-emergency facsimile notification required by 10 CFR 21.21(d)(3)(i). A written notification in accordance with 10 CFR 21.21(d)(3)(ii) will be provided within 30 days. NextEra Energy Seabrook, LLC has determined there is evidence that the Westinghouse Life Line D Type LAC Induction Motor Model HSDP 4000V, 700 hp motors, original to plant construction, have a deviation from expected quality of construction. Of the four motors purchased for Unit 1, Primary Component Cooling Water (PCCW) pumps CC-P-11-D and CC-P-11-C failed after approximately 87,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> of operation on July 23, 2008, and November 21, 2008, due to a short caused by localized heating. On June 13, 2015, CC-P-11-B failed due to shorted windings following approximately 32,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> of operation. Failure analysis determined the heating was most likely caused by a turn-to-turn short circuit which led directly to the eventual failure of the entire coil-to-ground. Forensic examination identified that the coil insulation was not tightly wrapped, resulting in less than 100% resin penetration throughout the stator insulation system (i.e., voids). The voids led to poor thermal conductivity and localized hot spots that accelerated the degrading of insulation properties over time. Based on the failure analysis, it can be concluded that the undesirable coil quality is most likely attributed to workmanship, not motor design. The failure of motor insulation could cause phase-to-phase and phase-to-ground faults which ultimately would prevent motor and PCCW pump from performing their intended safety function. The identified condition appears to be a deviation from expected quality of construction and the three failures indicate that the condition is likely applicable to all the motors manufactured at the same time. The NRC Senior Resident has been notified. |
| Where | |
|---|---|
| Westinghouse Seabrook, New Hampshire (NRC Region 1) | |
| Organization: | Nextera Energy Seabrook, Llc |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1196.32 h49.847 days <br />7.121 weeks <br />1.639 months <br />) | |
| Opened: | Ken Browne 11:45 Oct 20, 2016 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Oct 20, 2016 |
| 52310 - NRC Website | |
Westinghouse with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 544402019-12-12T05:00:00012 December 2019 05:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Fractured and Dislocated Control Rod Drive Mechanism Thermal Sleeve ENS 534222018-05-23T04:00:00023 May 2018 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Wear of Thermal Sleeve in Westinghouse Control Rod Drive Mechanisms ENS 530232017-10-11T07:00:00011 October 2017 07:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Notification - Hpsi Motor Lead Insulation Gouged ENS 523782016-11-18T05:00:00018 November 2016 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Notification - Control Rod Guide Card Excessive Wear ENS 523102016-08-31T15:26:00031 August 2016 15:26:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Westinghouse Life Line D Type Lac Induction Motor Failure 2019-12-12T05:00:00 | |