ML14113A588
| ML14113A588 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/21/2014 |
| From: | Mark D. Sartain Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 14-195 | |
| Download: ML14113A588 (4) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 April 21, 2014 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Serial No.
NAPS/JHL 14-195 Docket Nos.
50-338 50-339 License Nos.
NPF-4 NPF-7 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNITS 1 AND 2 INTERIM PART 21 NOTIFICATION REPORT Pursuant to 10 CFR 21.21(a)(2), Dominion is providing the required 60-day interim report for identification of a defect. During pre-installation bench testing of a Basler Motor Operated Control (Potentiometer) it was determined that the potentiometer was not functioning properly. The attachment to this letter provides the information requested by 10 CFR 21.21 (a)(2).
This letter does not establish any new commitments. Should you have any questions or require additional information, please contact Mr. Thomas Shaub at (804) 273-2763.
Very truly yours, Mark D. Sartain Vice President - Nuclear Engineering Commitments made in this letter: Expected Final Part 21 Submittal Date: June 30, 2014 Attachment c129 C
- cc:
Regional Administrator U.S. Nuclear Regulatory Commission, Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Senior Resident Inspector North Anna Power Station Dr. V. Sreenivas NRC Project Manager - North Anna U. S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 G-9A 11555 Rockville Pike Rockville, Maryland 20852-2738 Ms. M. C. Barillas NRC Project Manager - Surry U. S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 G-9A 11555 Rockville Pike Rockville, Maryland 20852-2738 Mr. J. E. Reasor Old Dominion Electric Cooperative Innsbrook Corporate Center, Suite 300 4201 Dominion Blvd.
Glen Allen, Virginia 23060
Attachment Interim Part 21 Notification Basler Motor Operated Control (Potentiometer)
Virginia Electric and Power Company (Dominion)
North Anna Power Station Units I and 2 Interim Part 21 Notification - Basler Motor Operated Control (Potentiometer)
Serial No.14-195 Interim Part 21 Page 1 of 1 Responsible Officer:
Mark D. Sartain, Vice President - Nuclear Engineering 5000 Dominion Blvd.
Glen Allen, Virginia 23060 Event Date:
February 21, 2014 Unit Name:
North Anna Power Station Component Information (as applicable):
Manufacturer:
Basler Motor Operated Control (Potentiometer)
Part Number:
Part No. 9072300102
==
Description:==
During return to service testing of an Emergency Diesel Generator (EDG) following preplanned maintenance, manual voltage control was determined to be inoperable and the EDG was subsequently secured. Troubleshooting identified a failed Motor Operated Control (Potentiometer) also referred to as an MP unit. The cause of the failure of the installed MP unit was determined to be a result of the maintenance activities during the recent outage for the EDG. The failed unit was removed from service and a new MP unit was obtained from stock.
The new MP unit failed to operate properly during pre-installation bench testing (operated correctly and then locked up). A second new MP unit was obtained from stock, successfully bench tested, installed, and the EDG was returned to service.
The failed MP unit obtained from stock was a Basler Motor Operated Control (Potentiometer),
Model No. MOC2013 and Part No. 9072300102. The function of the MP unit is to allow for manual control of voltage by the control room operator when aligning the EDG in the parallel mode of operation. This is considered a course adjustment controller as compared to the fine adjustment of the voltage regulator or Automatic Voltage Regulator (AVR). The system is also configured with a back up or redundant manual control Motor Operated Controller (auto-transformer) also referred to as the MOT.
Causes: The cause of the MP unit failure that was obtained from stock is unknown.
Immediate Corrective Actions: Material Number 42109345 (quantity 1) has been put in restricted stock.
The MP unit that failed bench testing was returned to the vendor for analysis and cause determination.
The following MP units have been issued from stock:
Work Order Number Issued Quantity 59079061601 05/12/08 1
59079061501 04/30/08 1
59079050301 03/20/08 1
59079050401 06/13/08 1
59102702868 02/21/14 2 (this is the batch where one failed)
Expected Final Part 21 Submittal Date: June 30, 2014