05000364/LER-2010-003, Regarding Power Supply to 1-2R Load Center Unavailability
| ML102030078 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 07/21/2010 |
| From: | Jerrica Johnson Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NL-10-1279 LER 10-003-00 | |
| Download: ML102030078 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(8) 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)(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 |
| 3642010003R00 - NRC Website | |
text
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July 21, 2010 Docket Nos.: 50-364 NL-10-1279 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Joseph M. Farley Nuclear Plant - Unit 2 Licensee Event Report 2010-003-00 Power Supply to 1-2R Load Center Unavailability Ladies and Gentlemen:
In accordance with the requirements of 10 CFR 50.73(a)(2)(i)(8), Southern Nuclear Operating Company is submitting the enclosed Licensee Event Report.
This letter contains no NRC commitments. If you have any questions, please contact Doug McKinney at (205) 992-5982.
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£Ohnsoo Vice President - Farley JRJ/JLS Enclosure: Unit 2 Licensee Event Report 2010-003-00
U. S. Nuclear Regulatory Commission NL-10-1279 Page 2 cc: Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President Mr. J. R. Johnson, Vice President - Farley Ms. P. M. Marino, Vice President - Engineering RTYPE: CFA04.054 U. S. Nuclear Regulatory Commission Mr. L. A. Reyes, Regional Administrator Mr. R. E. Martin, NRR Project Manager - Farley Mr. E. L. Crowe, Senior Resident Inspector - Farley Mr. P. Boyle, NRR Project Manager
Joseph M. Farley Nuclear Plant - Unit 2 Licensee Event Report 2010-003-00 Power Supply to 1-2R Load Center Unavailability Enclosure Unit 2 Licensee Event Report 2010-003-00
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 08131/2010 (9-2007)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 13. PAGE Joseph M Farley Nuclear Plant - Unit 2 05000364 1 of 3
- 4. TITLE Power Supply to 1-2R Load Center Unavailability
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL NUMBER REV NO.
MONTH DAY YEAR FACILITY NAME DOCKET NUMBER 05000 FACILITY NAME DOCKET NUMBER 08 05 2009 2010 - 003 -
00 07 21 2010 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check aI/ that apply) o 20.2201 (b) o 20.2203(a)(3)(i) o 50.73(a)(2)(i)(C) o 50.73(a)(2)(vii) 1 o 20.2201 (d) o 20.2203(a)(3)(ii) o 50.73(a)(2)(ii)(A) o 50.73(a)(2)(viii)(A) o 20.2203(a)(1)
[J 20.2203(a)(4) o 50.73(a)(2)(ii)(B) o 5O.73(a)(2)(viii)(B) o 20.2203(a)(2)(i) o 50.36(c)(1 )(i)(A) o 50.73(a)(2)(iii) o 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL o 20.2203(a)(2)(ii) o 50.36(c)(1)(ii)(A) o 50.73(a)(2)(iv)(A) o 50.73(a)(2)(x) o 20.2203(a)(2)(iii) o 50.36(c)(2) o 50.73(a)(2)(v)(A) o 73.71(a)(4) o 20.2203(a)(2)(iv) o 50.46(a)(3)(ii) o 50.73(a)(2)(v)(B) o 73.71(a)(5) 100 o 20.2203(a)(2)(v) o 50.73(a)(2)(i)(A) o 50.73(a)(2)(v)(C) o OTHER o 20.2203(a)(2)(vi) 181 50.73(a)(2)(i)(B) o 50. 73(a)(2)(v)(O)
Specify in Abstract below or in (If more space is required, use additional copies of NRC Form 366A) (17) 1-2A and 1-C are A-Train and EDGs 1B and 2B are B-Train. Farley also has a fifth diesel generator (2C), rated at 2,850 kW, that serves as a station blackout diesel and can be manually aligned to supply B-Train power to either unit and power loss-of-site-power (LOSP) loads.
During the time that EDG 1 C was inoperable (August 5 to August 9, 2009) for Unit 2, the EDG 1-2A and EDG 2B were operable and available to support any event on Unit 2, and the diesel generator 2C was available. During the time that 1 C EDG was inoperable for Unit 2, no events occurred which challenged the off-site power supplies. No safety system functional failures occurred. The 1 2R 600 V LC was aligned to its Unit 1 supply and the bus was energized to its proper voltage.
Therefore, the safety and health of the public was not adversely affected.
Corrective Action
- 1. The 4160 V supply breaker DH08-2 was reclosed on August 9, 2009.
- 2. Procedures were revised such that the appropriate operability determination will be made for the 1-2R 600 V LC and to contain guidance to reclose the 4160 V supply breaker DH08-2, as well as explaining the LCO consequences of not closing the supply breakers to the 1-2R 600 V LC.
Additional Information
This LER is being submitted more than sixty-days after the event date due to the initial classification of this event by the licensee as non-reportable. The power-seeking function for the 1-2R 600 V LC was considered by the licensee to be a function associated with EDG 1 C since the LC supplies the auxiliary loads for the EDG, thus the event was not reportable. Subsequently, the NRC determined that the power-seeking function was a part of the Electrical Distribution System (LCO 3.8.9). The NRC formalized their position in Inspection Report 2009-005.
Previous Similar Event: None.