05000338/LER-2003-004, Regarding Automatic Reactor Trip Due to Main Transformer Fault
| ML032170628 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/29/2003 |
| From: | Heacock D Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 03-369 LER 03-004-00 | |
| Download: ML032170628 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| 3382003004R00 - NRC Website | |
text
1 OCFR50.73 Virginia Electric and Power Company North Anna Power Station P. O. Box 402 Mineral, Virginia 23117 July 29, 2003 U. S. Nuclear Regulatory Commission Serial No.:
03-369 Attention: Document Control Desk NAPS:
MPW Washington, D. C. 20555-0001 Docket No.: 50-338 License No.: NPF-4
Dear Sirs:
Pursuant to 10CFR50.73, Virginia Electric and Power Company hereby submits the following Licensee Event Report applicable to North Anna Power Station Unit 1.
Report No. 50-338/2003-004-00 This report has been reviewed by the Station Nuclear Safety and Operating Committee and will be forwarded to the Management Safety Review Committee for its review.
Very truly yours, D. A. Heacock, Site Vice President North Anna Power Station Enclosure Commitments contained in this letter: None cc:
United States Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23 T85 Atlanta, Georgia 30303-8931 Mr. M. J. Morgan NRC Senior Resident Inspector North Anna Power Station
NRC FORM 366 U.S. NUCLEAR REGULATORY APPROVED BY OMB NO. 3150-0104 EXPIRES 7-31.2004 (7-2001)
COMMISSION
the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
FACILITY NAME (1)
DOCKET NUMBER (21 PAGE (3)
NORTH ANNA POWER STATION, UNIT 1 l 05000 - 338 1 1 OF 5 TITLE (4)
Automatic Reactor Trip Due to Main Transformer Fault EVENT DATE (5)
LER NUMBER (6)
REPORT DATE (7)
OTHER FACILITIES INVOLVED (8)
MONTH DAY YE YEA SEQUENTIAL REVISION MONTH DAY YEA FACILITY NAME DOCUMENT NUMBER NUMBER NUMBER l 1
l l05000-06 11 2003 2003
- - 004 --
00 07 29 2003 FACILnY NAME DOCUMENT NUMBER OPERATING THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR j: (Check all that apply) (11)
MODE (9) 1 20.2201(b) 20.2203(a)(3Xii)
=
50.73(aX2)(IiXB) 50.73(a)(2XixXA)
POWER 20.2201 (d) 20.2203(a)(4) 50.73(aX2)(iii) 50.73(a)(2Xx)
LEVEL (10) 100 %
20.2203(aXl)
=
50.36(c)( i )(A)
X 50.73(aX2)(ivXA)
=
73.71 (a)(4) 20.2203(aX2)(i) 50.36(cXl )(ii)(A) 50.73(aX2Xv)(A) 73.71 (a)(5) 20.2203(aX2)(ii) 50.36(cX2) 50.73(aX2XvXB)
OTHER 20.2203(aX2)(iii) 50.46(a)(3Xii) 50.73(a)(2XvXC)
Specify In Abstract below or 20.2203(aX2Xiv) 50.73(aX2XiXA) 50_
0.73(aX2XvXD)
In (If more space is required, use additional copies of (If more space is required, use additional copies of (if more space is required, use additional copies of NRC Form 366A) (17) 6.0 ACTIONS TO PREVENT RECURRENCE Completed corrective actions should preclude recurrence. Additional enhancements are being evaluated as part of the root cause evaluation and will be implemented as appropriate. The remaining transformers at the station are manufactured by Westinghouse or General Electric. The General Electric transformers use a crimp connection and the Westinghouse transformers use a double lug connector.
7.0 SIMILAR EVENTS
LER N2-00-001-00 dated April 25, 2000, documented an automatic reactor trip on Unit 2 as a result of a secondary feeder cable failure on the 2C station service transformer.
8.0 ADDITIONAL INFORMATION
At the time of this event Unit 2 was operating at 100 percent power and was not affected by this event.
Transformers at the station include:
Unit 1 Main Transformers (3) manufactured by McGraw - Edison Spare Main Transformers (2) manufactured by McGraw - Edison Unit 2 Main Transformers (3) manufactured by General Electric Units 1 and 2 Station Service Transformers (6) manufactured by Westinghouse Reserve Station Service Transformers (4) manufactured by General Electric
Component failure information
Description
Main Transformer Manufacturer:
McGraw - Edison Serial No.:
C-06625-5-3