05000219/LER-2009-005, Regarding Reactor Scram Following a Transmission Line Lightning Strike
| ML092590061 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 09/10/2009 |
| From: | Massaro M Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA-09-070 LER 09-005-00 | |
| Download: ML092590061 (4) | |
| 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 |
| 2192009005R00 - NRC Website | |
text
Exelkn Oyster Creek Generating Station www.exeloncorp.com Route 9 South Nuclear PO Box 388 Forked River, NJ 08731 RA-09-070 10 CFR 50.73 September 10, 2009 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 - 0001 Oyster Creek Nuclear Generating Station Renewed Facility Operating License No. DPR-16 NRC Docket No. 50-219
Subject:
Licensee Event Report (LER) 2009-005-00, Reactor Scram Following a Transmission Line Lightning Strike Enclosed is LER 2009-005-00, Reactor Scram Following a Transmission Line Lightning Strike. This event did not affect the health and safety of the public or plant personnel.
This event did not result in a safety system functional failure. There are no regulatory commitments made in this LER submittal. The detailed analysis of the event, determination of the cause of the affected transmission line breaker failure and circumstances surrounding the event is being investigated and will be reported in a supplement to this LER.
Should you have any questions concerning this letter, please contact Richard Milos, Regulatory Assurance, at (609) 971-4973.
Respectfully, Michael J. Massaro Vice President Oyster Creek Nuclear Generating Station Enclosure: NRC Form 366, LER 2009-005-00 cc:
Administrator, NRC Region 1 NRC Senior Resident Inspector - Oyster Creek Nuclear Generating Station NRC Project Manager - Oyster Creek Nuclear Generating Station
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 08/31/2010 (9-2007)
, the NRC may digits/characters for each block) not conduct or sponsor, and a person is not required to respond to, the information collection.
- 13. PAGE Oyster Creek, Unit 1 05000219 1 OF 3
- 4. TITLE Reactor Scram Following a Transmission Line Lightning Strike
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEQUENTIAL I REV MONTH DAY YEAR N/A O
N/A FACILITY NAME DJOCKET NUMBER 07 12 2009 2009 005 -
00 09 10 2009 N/A N/A
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
[1 20.2201(b)
El 20.2203(a)(3)(i)
El 50.73(a)(2)(i)(C)
El 50.73(a)(2)(vii)
N El 20.2201(d)
El 20.2203(a)(3)(ii)
El 50.73(a)(2)(ii)(A)
[I 50.73(a)(2)(viii)(A)
El 20.2203(a)(1)
El 20.2203(a)(4)
[I 50.73(a)(2)(ii)(B)
El 50.73(a)(2)(viii)(B)
[I 20.2203(a)(2)(i)
El 50.36(c)(1)(i)(A)
C3 50.73(a)(2)(iii)
El 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL [I 20.2203(a)(2)(ii)
[- 50.36(c)(1)(ii)(A) 9 50.73(a)(2)(iv)(A)
El 50.73(a)(2)(x)
El 20.2203(a)(2)(iii)
[I 50.36(c)(2)
E3 50.73(a)(2)(v)(A)
E3 73.71 (a)(4) 100
[] 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
El 50.73(a)(2)(v)(B)
El 73.71 (a)(5)
El 20.2203(a)(2)(v)
El 50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C)
[E OTHER El 20.2203(a)(2)(vi)
[I 50.73(a)(2)(i)(B)
Cl 50.73(a)(2)(v)(D)
Specify in Abstract below or in
Corrective Actions
The detailed analysis and cause determination is still under investigation. Complete descriptions of corrective actions will be included in a Supplemental LER.
Corrective actions taken to date include, restoring the EDG
- 1 to full operable status, flushing the "B" IC level indication lines and repairing the Q-121 line breaker. These actions addressed the anomalies noted above.
The Q-121 line breaker was repaired by First Energy. Any lessons learned from that repair and the cause determination will be placed in Oyster Creek's corrective action program database.
Previous Occurrences
There have been no similar LERs submitted due to lightning strikes at Oyster Creek in the last three years.
However, there was a lighting strike in June 2009 on the Q-121 transmission line, which resulted in a less severe grid disturbance and no plant scram occurred.
Component Failure Data
Component: Transmission Line Breaker Manufacturer: General Electric Serial No: NA
Cause
Trip Coil MisalignedPRINTED ON RECYCLED PAPERPRiNTED ON RECYCLED PAPER