05000424/LER-2009-003, High Main Turbine Vibration Results in Manual Reactor Trip of Unit 1
| ML100430343 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 02/02/2010 |
| From: | Tynan T Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NL-10-0121 LER 09-003-00 | |
| Download: ML100430343 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(iv)(A), System Actuation 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)(8) 10 CFR 50.73(a)(2)(viii)(8) 10 CFR 50.73(a)(2)(ix)(A) 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)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(1) |
| 4242009003R00 - NRC Website | |
text
Southern Nuclear Operating Company, Inc.
Vogtle Electric Generating Plant 7821 River Road Waynesboro, Georgia 30830 Tel 706.724.1562 or 706.554.9961 SOUTHERN'\\'
February 2, 2010 COMPANY Docket Nos.: 50-424 NL-10-0121 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant-Unit 1 Licensee Event Report 1-2009-003 High Main Turbine Vibration Results in a Manual Reactor Trip of Unit 1 Ladies and Gentlemen:
In accordance with the requirements of 1 OCFR50.73(a) (2)(iv)(A), Southern Nuclear Operating Company (SNC) is submitting the enclosed Licensee Event Report.
This letter contains no NRC commitments. If you have any questions, please advise.
Respectfully submitted, 1.).?~
T.
Tynan Vice President - Vogtle TETrrMH/sdc Enclosure: LER 1-2009-003 cc:
Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President Mr. T.
Tynan, Vice President - Vogtle Ms. P. M. Marino, Vice President - Engineering RType: CVC7000 U. S. Nuclear Regulatory Commission Mr. L. A. Reyes, Regional Administrator Ms. D. N. Wright, NRR Project Manager - Vogtle Mr. M. Cain, Senior Resident Inspector - Vogtle
Enclosure Vogtle Electric Generating Plant-Unit 1 Licensee Event Report 1-2009-003 High Main Turbine Vibration Results in a Manual Reactor Trip of Unit 1
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 infnrmAtifln ('ollAf"tinn 1, FACILITY NAME
- 2. DOCKET NUMBER
- 13. PAGE Vogtle Electric Generating Plant - Unit 1 05000424 1 OF 4
- 4. TITLE High Main Turbine Vibration Results in a Manual Reactor Trip of Unit 1
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED FACILITY NAME DOCKET NUMBER SEQUENTIAL I ~~V MONTH DAY YEAR YEAR MONTH DAY YEAR NUMBER 05000 FACILITY NAME DOCKET NUMBER 12 09 09 2009 003 0
02 02 2010 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check all 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) o 20.2203(a)(4) o 50.73(a)(2)(ii)(8) o 50.73(a)(2)(viii)(8) o 20,2203(a)(2)(i) o 50.36(c)(1 )(i)(A) o 50,73(a)(2)(iil) o 50.73(a)(2)(ix)(A) 10, POWER LEVEL o 20.2203(a)(2)(ii) o 50.36(c)(1 )(ii)(A) 181 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)
[] 20,2203(a)(2)(iv) o 50.46(a)(3)(ii) o 50,73(a)(2)(v)(8) o 73.71 (a)(5) 024
[] 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) o 50.73(a)(2)(1)(8) o 50.73(a)(2)(v)(D)
Specify in Abstract below or in NRC Form 3RRA
- 12. LICENSEE CONTACT FOR THIS LER FACILITY NAME I~ELEPHONE NUMBER (Include Area COde)
Vogtle Electric Generating Plant/Mark Hickox, Principal Licensing Engineer (706) 826-4129 MANU-REPORTABLE MANU-REPORTABLE
CAUSE
SYSTEM COMPONENT
CAUSE
SYSTEM COMPONENT FACTURER TO EPIX FACTURER TO EPIX
- 14. SUPPLEMENTAL REPORT EXPECTED
- 15. EXPECTED MONTH DAY YEAR SUBMISSION o YES (If yes, complete 15. EXPECTED SUBMISSION DATE) 181 NO DATE ABSTRACT (Limit to 1400 spaces, i.e.* approximately 15 single-spaced typewritten lines)
On December 09,2009 at approximately 23: 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> Eastern Standard Time (EST), during power ascension from an unplanned shutdown, with the unit operating at approximately 24 percent rated thermal power, the reactor was manually tripped. As preparations were being made to synchronize the main generator to the grid, high vibrations were experienced on the high pressure turbine. Due to the high vibrations on the turbine, the turbine was manually tripped. As the turbine was coasting down vibration levels continued to increase. Therefore condenser vacuum was broken to slow the turbine to minimize any potential damage. Prior to breaking condenser vacuum and in anticipation of the trip of the operating main feedwater pump due to low condenser vacuum, the control room operators manually tripped the reactor.
Once condenser vacuum had decreased below the main feedwater pump trip setpoint, the main feedwater pump tripped and the motor driven auxiliary feedwater (AFW) pumps automatically started. All control rods fully inserted and all safety systems responded in accordance with plant design. The plant was stabilized in Mode 3.
NRC FORM 366 (9-2007)
PRINTED ON RECYCLED PAPER
4 (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)
- 2. Previous Similar Event:
A review of Licensee Event Reports for the past three years did not identify a similar oCCUrrence where a manual actuation of the RPS was required as a result of high vibrations associated with the main turbine.
- 3. Energy Industry Identification System Codes:
Main Turbine System-TA Auxiliary Feedwater System-BA PRINTED ON RECYCLED PAPER)