ML031290629
| ML031290629 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/08/2003 |
| From: | Salas P Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RIS-01-005 | |
| Download: ML031290629 (5) | |
Text
May 8, 2003 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT - APRIL MONTHLY OPERATING REPORT The enclosure provides the April Monthly Operating Report as required by Sequoyah Technical Specification Section 6.9.1.10.
This letter is being sent in accordance with NRC RIS 2001-05.
If you have any questions concerning this matter, please call me at (423) 843-7170 or J. D. Smith at (423) 843-6672.
Sincerely, Original signed by Pedro Salas Licensing and Industry Affairs Manager Enclosure cc (Enclosure):
Mr. Michael L. Marshall, Jr., Senior Project Manager U.S. Nuclear Regulatory Commission MS O-8G9A One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2739
ENCLOSURE TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT (SQN)
MONTHLY OPERATING REPORT APRIL 2003 UNIT 1 DOCKET NUMBER 50-327 LICENSE NUMBER DPR-77 UNIT 2 DOCKET NUMBER 50-328 LICENSE NUMBER DPR-79
E-1 OPERATING DATA REPORT Docket No.
50-327 Unit Name SQN Unit 1 Date May 6, 2003, 2003 Completed By Tanya Hollomon Telephone (423) 843-7528 Reporting Period April 2003
- 1.
Design Electrical Rating (Net MWe):
1160
- 2.
Maximum Dependable Capacity (MWe-Net) 1125 Month Yr-to-Date Cumulative
- 3.
Number of Hours Reactor was Critical 0.0 1,803.2 127,269.0
- 4.
Hours Generator On-Line 0.0 1,803.2 125,343.8
- 5.
Unit Reserve Shutdown Hours 0.0 0.0 0.0
- 6.
Net Electrical Energy Generated (MWh) 0 2,071,307 136,355,397 Docket No.
50-328 Unit Name SQN Unit 2 Date May 6, 2003 Completed By Tanya Hollomon Telephone (423) 843-7528 Reporting Period April 2003
- 1.
Design Electrical Rating (Net MWe):
1160
- 2.
Maximum Dependable Capacity (MWe-Net):
1126 Month Yr-to-Date Cumulative
- 3.
Number of Hours Reactor was Critical 692.9 2,449.6 131,675.1
- 4.
Hours Generator On-Line 688.2 2,399.5 129,497.1
- 5.
Unit Reserve Shutdown Hours 0.0 0.0 0.0
- 6.
Net Electrical Energy Generated (MWh) 774,210 2,678,147 138,402,249
E-2 UNIT SHUTDOWNS DOCKET NO:
50-327 UNIT NAME:
SQN-1 DATE:
May 6, 2003 COMPLETED BY: Tanya Hollomon TELEPHONE:
(423) 843-7528 REPORT PERIOD: APRIL 2003 No.
Date Type F:Forced S:Scheduled Duration (Hours)
Reason1 Method of Shutting Down Reactor2 Cause and Corrective Action to Prevent Recurrence 1
030401 S
719.0 C
4 Unit 1 Cycle 12 refueling and steam generator replacement outage continued throughout the month of April.
Summary: Unit 1 Cycle 12 refueling and steam generator replacement outage continued throughout the month of April. Unit 1 was in No Mode at the end of the month.
1 Reason:
2 Method A-Equipment Failure (Explain) 1-Manual B-Maintenance or Test 2-Manual Trip/Scram C-Refueling 3-Automatic Trip/Scram D-Regulatory Restriction 4-ContinuationOutage E-Operator Training / License Examination 5-Other (Explain)
F-Administrative G-Operational Error (Explain)
H-Other (Explain)
E-3 UNIT SHUTDOWNS DOCKET NO:
50-328 UNIT NAME:
SQN-2 DATE:
May 6, 2003 COMPLETED BY: Tanya Hollomon TELEPHONE:
(423) 843-7528 REPORT PERIOD: APRIL 2003 No.
Date Type F:Forced S:Scheduled Duration (Hours)
Reason1 Method of Shutting Down Reactor2 Cause and Corrective Action to Prevent Recurrence 4
030412 F
30.8 A
3 On April 12 at 2221 EDT, Unit 2 Operations personnel opened Vibration Power Drawer No. 1, to reset a trip light on No. 7 turbine bearing. After resetting the trip light, Operations proceeded to place the drawer back into its normal position.
Upon sliding the drawer back into the panel, a spurious turbine vibration trip signal occurred, initiating an automatic turbine trip and subsequent reactor trip.
Investigation determined that the drawer wiring had pinched several wires exposing some conductors. When the drawer was inserted, it is suspected that one of the exposed conductors shorted against the cabinet casing or shorted with another exposed conductor which led to relay energizing. A temporary alteration was implemented to lift the wire from the relay preventing this kind of failure from reoccurring.
Summary: Unit 2 gross maximum dependable capacity factor was 95.4 percent for the month of April. Unit 2 was operating at 95 percent power at the beginning of April and reached 100 percent on April 1. On April 12 at 2221 EDT, Unit 2 experienced an automatic reactor trip following a turbine high vibration turbine trip. The unit was returned to service at 0510 EDT on April 14, 2003.
Unit 2 continued to operate at 100 percent reactor power throughout the remainder of the month.
1 Reason:
2 Method A-Equipment Failure (Explain) 1-Manual B-Maintenance or Test 2-Manual Trip/Scram C-Refueling 3-Automatic Trip/Scram D-Regulatory Restriction 4-ContinuationOutage E-Operator Training / License Examination 5-Other (Explain)
F-Administrative G-Operational Error (Explain)
H-Other (Explain)