ENS 49534
ENS Event | |
|---|---|
05:00 Oct 25, 2013 | |
| Title | Part21 - Diode Cr7 Wiring Reversed on Automatic Voltage Regulator Panels |
| Event Description | The following is a summary of information received via facsimile:
Engine Systems Inc. (ESI) began a 10CFR21 evaluation on 10/25/2013 after receiving notification from APS-Palo Verde Nuclear Generating Station that diode CR7 on their automatic voltage regulator (AVR) panels had the wiring connections reversed. During installation of the AVR panels, generator output voltage buildup was observed to be longer than expected during fast start testing. The slow voltage buildup was determined to be caused by a lack of generator field flashing. Troubleshooting revealed that the field flash diode CR7 wiring was reversed. The evaluation was concluded on 11/11/2013, and it was determined that this issue is a reportable defect as defined by 10CFR21. The incorrect wiring of diode CR7 prevents field flashing of the generator. Lack of generator field flashing can result in failure of generator voltage buildup, or excessive voltage buildup time, during starting of the emergency diesel generator (EDG). This condition could therefore have impacted operability of the EDG and prevented it from performing its safety related function. APS-Palo Verde is the only affected customer. This reversed CR7 wiring condition only applies to the five (5) AVR panels (P/N 072-12200-100-PVNGS) shipped to Palo Verde on ESI sales order 8001720 (4 panels shipped in May 2013 and 1 panel shipped in June 2013). |
| Where | |
|---|---|
| Engine Systems, Inc. Rocky Mount, North Carolina (NRC Region 1) | |
| Organization: | Engine Systems, Inc. |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+461.3 h19.221 days <br />2.746 weeks <br />0.632 months <br />) | |
| Opened: | Tom Horner 11:18 Nov 13, 2013 |
| NRC Officer: | Dong Park |
| Last Updated: | Nov 13, 2013 |
| 49534 - NRC Website | |
Engine Systems, Inc. with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 569132023-11-27T05:00:00027 November 2023 05:00:00
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