05000281/LER-2013-001, Bird Contacting Power Lines Results in Emergency Diesel Generator Auto-Start
| ML13056A411 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 02/15/2013 |
| From: | Lane N Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER 13-001-00 | |
| Download: ML13056A411 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 2812013001R00 - NRC Website | |
text
10CFR50.73 Virginia Electric and Power Company Surry Power Station 5570 Hog Island Road Surry, Virginia 23883 February 15, 2013 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555-0001 Serial No.:
SPS:
Docket No.:
License No.:
13-087 JCP 50-281 DPR-37
Dear Sirs:
Pursuant to 10CFR50.73, Virginia Electric and Power Company hereby submits the following Licensee Event Report applicable to Surry Power Station Unit 2.
Report No. 50-281/2013-001-00 This report has been reviewed by the Station Facility Safety Review Committee and will be forwarded to the Management Safety Review Committee for its review.
Very truly yours, N. L. Lane, Site Vice President Surry Power Station Enclosure Commitment contained in this letter: None
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cc: U.S. Nuclear Regulatory Commission, Region II Marquis One Tower, Suite 1200 245 Peachtree Center Ave., NE Atlanta, GA 30303-1257 NRC Senior Resident Inspector Surry Power Station
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES 10/31/2013 (10-2011)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. PAGE Surry Power Station, Unit 2 05000-281 1 OF 3
- 4. TITLE Bird Contacting Power Lines Results in Emergency Diesel Generator Auto-Start
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED SEQUENTIAL REV FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR NUMBER NO.
MONTH DAY YEAR Surry Power Station, Unit 1 05000-280 12 29 12 2013 -
001 -
00 02 15 2013 FACILITY NAME DOCKET NUMBER
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
[
20.2201(b) rJ 20.2203(a)(3)(i) 50.73(a)(2)(i)(C)
EJ 50.73(a)(2)(vii)
N J 20.2201(d)
[J 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(A)
EJ 50.73(a)(2)(viii)(A)
[] 20.2203(a)(1)
[]
20.2203(a)(4)
[]
50.73(a)(2)(ii)(B)
[]
50.73(a)(2)(viii)(B)
EJ 20.2203(a)(2)(i) jJ 50.36(c)(1)(i)(A) 1j 50.73(a)(2)(iii) 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL EJ 20.2203(a)(2)(ii)
[]
50.36(c)(1)(ii)(A)
El 50.73(a)(2)(iv)(A)
[
50.73(a)(2)(x)
[] 20.2203(a)(2)(iii)
D 50.36(c)(2) 1:1 50.73(a)(2)(v)(A)
[]
73.71(a)(4) 100 El 20.2203(a)(2)(iv)
Q50.46(a)(3)(ii)
EJ 50.73(a)(2)(v)(B)
[J 73.71(a)(5)
E] 20.2203(a)(2)(v)
[J 50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C)
El OTHER
- 20. 50.73(a)(2)(i)(B) r DSpecify in Abstract below
___20.2203(a)(2)(vi)_
U50.73(a)(2)(i)(B)
[0 50.73(a)(2)(v)(D) or in NRC Form 366A
- 12. LICENSEE CONTACT FOR THIS LER FACILITY NAME TELEPHONE NUMBER (include Area Code)
N.L. Lane, Site Vice President (757) 365-2001MANU-REPORTABLE MANU-REPORTABLE
CAUSE
SYSTEM COMPONENT
CAUSE
SYSTEM COMPONENT FACURE R
EPIX FACTURER TO EPIX FACTURER TO EPIX C
EA XFMR M390 Y
- 14. SUPPLEMENTAL REPORT EXPECTED
- 15. EXPECTED MONTH DAY YEAR SUBMISSION El YES (If yes, complete 15. EXPECTED SUBMISSION DATE)
E[ NO DATE ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)
At 08:03 on December 29, 2012, with both Unit 1 and Unit 2 operating at 100%, the supply breaker to the B reserve station service transformer (RSST) tripped open on an instantaneous over-current of the B and C phases due to a pelican contacting the overhead lines from the switchyard to the B RSST. This resulted in a lockout of the B RSST and loss of power to the E transfer bus and the Unit 2 H emergency bus from its normal off-site power supply. An under-voltage auto start signal was generated, and emergency diesel generator (EDG) 2 started and loaded on the Unit 2 H emergency bus as designed. Equipment performed as expected during the event, and there were no unexplained occurrences. Visual inspections verified there was no damage to the lines, supply breaker, or B RSST. The E transfer bus was reenergized at 12:23, and the normal source of power was restored to Unit 2 H emergency bus at 12:42. EDG 2 was returned to auto at 15:18. All electrical distribution systems were restored to a normal alignment. The work management process has been initiated to install bird diverters on the lines. This report is being submitted, pursuant to 10 CFR 50.73(a)(2)(iv)(A), for automatic actuation of EDG 2. This event did not affect the health and safety of the public.
1.0 DESCRIPTION OF THE EVENT At 08:03 on December 29, 2012, with both Unit 1 and Unit 2 operating at 100%, the supply breaker [EIIS-EA-BKR] to the B reserve station service transformer (RSST)
[EIIS-EA-XFMR] tripped open on an instantaneous over-current of the B and C phases due to a pelican contacting the overhead lines from the switchyard to the B RSST. This resulted in a lockout of the B RSST and loss of power to the E transfer bus [EIIS-EA-BU] and the Unit 2 H emergency bus [EIIS-EA-BU] from its normal off-site power supply. An under-voltage automatic start signal was generated, and emergency diesel generator (EDG) 2 [EIIS-EK-GEN] started and loaded on the Unit 2 H emergency bus as designed.
All equipment performed as expected during the event, and there were no unexplained occurrences.
Visual inspections verified there was no damage to the lines, supply breaker, or B RSST. The E transfer bus was reenergized at 12:23, and the normal source of power was restored to Unit 2 H emergency bus at 12:42. EDG 2 was returned to automatic control at 15:18. All electrical distribution systems were restored to a normal alignment.
At 15:21, an event notification was made to the NRC for the EDG 2 actuation in accordance with 10 CFR 50.72(b)(3)(iv)(A). This report is also being submitted, pursuant to 10 CFR 50.73(a)(2)(iv)(A), for automatic actuation of EDG 2.
2.0
SIGNIFICANT SAFETY CONSEQUENCES AND IMPLICATIONS
The event was uncomplicated, with no equipment failures. Equipment performed as expected. EDG 2 started and restored power to the 2H bus as designed. Sufficient alternate sources of power were available, including the swing EDG and the station blackout diesel. This event is considered to be of low safety significance. As a result, the health and safety of the public were not affected.
3.0
CAUSE
The overhead lines extending from the switchyard to the B RSST traverse over the intake canal. A pelican observed in the canal flew up into the lines and contacted the B and C phases.U.S. NUCLEAR REGULATORY COMMISSION (10-2011)
LICENSEE EVENT REPORT (LER)
CONTINUATION SHEET
- 1. FACILITY NAME
- 2. DOCKET
- 6. LER NUMBER
- 3. PAGE SEQUENTIAL REV Surry Power Station 05000-281 NUMBER NO.
3 of 3 2013 001 00 4.0 IMMEDIATE CORRECTIVE ACTION(S)
Visual inspections of the overhead lines, supply breaker, and B RSST identified no damage.
The E transfer bus was reenergized, the normal source of power was restored to Unit 2 H emergency bus, and EDG 2 was returned to automatic control.
5.0
ADDITIONAL CORRECTIVE ACTIONS
The company biologist and the Department of Agriculture were contacted for recommendations for preventing pelican interaction with overhead lines.
6.0 ACTIONS TO PREVENT RECURRENCE The work management process has been initiated to install diverters on the live high voltage lines that extend over the intake canal.
7.0
SIMILAR EVENTS
No similar events involving birds contacting the lines from the switchyard to the RSSTs have occurred. However, other events involving birds contacting other overhead lines have occurred. Diverters have been installed in response to these events.
8.0 MANUFACTURER/MODEL NUMBER Moloney Elec. Co./Serial Number P690265 9.0
ADDITIONAL INFORMATION
None