ML20095J046
| ML20095J046 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 11/30/1995 |
| From: | Hollomon T, Shell R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9512260275 | |
| Download: ML20095J046 (11) | |
Text
. -
En Tennessee Valley Authority, Post Office Box 2000, Soddy-Dasy, Tennessee 37379-2000 December 15, 1995 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 (SQN) - NOVEMBER 1995 MONTHLY OPERATING REPORT Enclosed is the November 1995 Honthly Operating Report as required by SQN Technical Specification 6.9.1.10.
If you have any questions concerning this matter, please call J. W. Proffitt at (615) 843-6651.
Sincerely, o N.
R. H. Shell i
Manager SQN Site Licensing Enclosure cca See page 2 l
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9512260275 951130
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PDR ADOCK 05000327
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U.S. Nuclear Regulatory Commission Page 2 December 15, 1995 i
f cc (Enclosure):
INPO Records Center
. Institute of Nuclear Power Operations 4
700 Galleria Parkway Atlanta, Georgia 30339-5957 Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike I
Rockville, Maryland 20852-2739 1
NRC Resident Inspector i
Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 l
Regional Administrator U.S. Nuclear Regulatory Commission Region II i
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 Mr. Joseph Santucci, Manager Advanced Reactor Department Electric Power Research Institute 3340 Hillview Avenue Palo Alto, California 94304 Mr. F. Yost, Director Research Services Utility Data Institute 1200 G Street, NW, Suite 250 Washington, D.C. 20005
e TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT MONTHLY OPERATING REPORT TO THE NUCLEAR REGULATORY COMMISSION NOVEMBER 1995 i
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UNIT 1
+
DOCKET NUMBER 50-327 4
LICENSE NUMBER DPR-77 i
UNIT 2 DOCKET NUMBER 50-328 LICENSE NUMBER DPR-79 i
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a OPERATIONAL
SUMMARY
NOVEMBER 1995 UNIT 1 l
1 Unit 1 generated 254,475 megawatthours (HWh) (gross) electrical power j
during November with a capacity factor of 30.7 percent.
The Unit 1 Cycle 7 refueling outage was still in progress at the beginning of November.
l Unit I was initially taken critical on November 9 at 2327 EST and tied to the grid on November 11 at 2205 EST, ending the refueling outage. The Unit 1 turbine was taken off-line on November 12 at 1058 EST for turbine j
overspeed testing and was back on-line at 2030 EST that day, i
On November 18 at approximately 2049 EST, with Unit 1 operating at i
approximately 89 percent power, Unit 1 experienced a secondary plant transient. The transient began when a spurious close signal to the main j
turbine intercept valves was generated. The
'A' and
- B' intercept valves closed which resulted in swings in the secondary plant. These swings 1
resulted in a turbine runback. After observing continued swings in the main feedwater pumps and determining that the intercept valves had
,j' closed, the decision was made to further reduce power and trip the main j
turbine. This was accomplished at 2106 EST.
The reactor was stabilized at 2 percent power.
I Troubleshooting determined that a failed circuit card in the analog i
electro-hydraulic control system had generated a close intercept valve signal. Corrective actions for this event include disabling this l
circuit. Power increase was initiated on November 20 at 0503 EST, and 1
the generator was tied on-line at 1320 EST that day.
)
On November 27 at approximately 1340 EST, intermittent swings started on the secondary plant instrumentation channels. At 1512 EST, power i
decrease was initiated, and the turbine was manually tripped at 3
1527 EST.
Reactor power was decreased to approximately 2 percent.
Arcing was reported inside the exciter housing. The arcing observed before shutdown was identified to be a manufacturer-supplied jumper cable on the current-limiting resistors. The cable lug was in contact with the metal support for the resistor, and the insulation had worn through. The cable lug was replaced.
j p
Power increase was initiated on Novenber 30 at 0625 EST, and the generator was tied on-line at 1433 EST that day.
Unit 1 was at approximately 30 percent power at the end of November.
UNIT 2 Unit 2 generated 852,070 megawatthours (MWh) (gross) electrical power during November with a capacity factor of 103.3 percent. There were no outages or power reductions of greater than 20 percent to report during November. Unit 2 was operating at 100 percent at the end of November.
1 e
E
AVERAGE DAILY UNIT POWER LEVEL DOCKET NO.
50-327 UNIT No.
One DATE:
12-01-95 COMPLETED BY:
T.
J.
Hollomon TELEPHONE:
(615) 843-7528 MONTH:
NOVEMBER 1995 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL Q&X fMWe-Net) pal (MWe-Net) 1
-23 17 776 2
-11 18 753 3
-11 19
-30 4
-11 20 124 5
-18 21 757 6
-23 22 1020 7
-32 23 1144 8
-37 24 1149 9
-34 25 1146 10
-34 26 1156 11
-22 27 660 12 83 28
-30 13 248 29
-32 14 251 30 88 15 251 31 NA 16 352
AVERAGE DAILY UNIT POWER LE1/EL DOCKET NO.
50-328 UNIT No.
Two DATE:
12-01-95 COMPLETED BY '
T. J. Ho11omon TELEPHONE:
(615) 843-7528 MONTH:
NOVEMBER 1995 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL QAX fMWe-Net)
R&X (MWe-Net) 1 1145-17 1146 2
1144 18 1147 3
1143 19 1148 4
1143 20 1146 5
1144 21 1147 6
1144 22 1149 7
1144 23 1149 8
1140 24 1151 9
1144 25 1149 10 1144 26 1149 11 1145 27 1152 1
12 1144 28 1148 13 1143 29 1147 14 1143 30 1147 15 1143 31 NA 16 1144
OPERATING DATA REPORT DOCKET NO.
50-327 DATE 12/01/95 COMPLETED BY T. J. Ho' lomon TELEPHONE (615) 84'.1-7528 i
OPERATING STATUS l Notes l
1.
Unit Name:
Seouovah Unit One l
l 2.
Reporting Period:
November 1995 l
l
'.. Licensed Thermal Power (MWt): 3411.0 l
l 4.
Nameplate Rating (Gross MWe): 1220.6 l
l 5.
Design Electrical Rating (Net MWe): 1148.0 l
l 6.
Maximum Dependable Capacity (Gross HWe): 1151.0 l
l 7.
Maximum Dependable Capacity (Net MWe): 1111.0 l
'l 8.
If Changes Occur in Capacity Ratings (Item Numbers 3 Through 7) Since Last Report, Give Reasons:
9.
Power Level To Which Restricted, If Any (Net MWe):
N/A
- 10. Reasons For Restrictions, If Any:
N/A This Month Yr-to-Date Cumulative
- 11. Hours in Reporting Period 720 8.016 126.385
- 12. Number of Hours Reactor Was Critical 504.6 6.288.7 68.340
- 13. Reactor Reserve Shutdown Hours 0
0 0
- 14. Hours Generator On-Line 337.1 6.078.3 66.682.6
- 15. Unit Reserve Shutdown Hours 0
0 0
- 16. Gross Thermal Energy Generated (MWH) 782.272.5 18.962.283.Q_
216.538.282
- 17. Gross Electrical Energy Generated (MWH) 254.475 6.496.335 73.547.219
- 18. Net Electrical Energy Generated (MWH) 232.595 6.229.040 70.492.453
- 19. Unit Service Factor 46.8 75.8 52.8
- 20. Unit Availability Factor 46.8 75.8 52.8
- 21. Unit Capacity Factor (Using HDC Net) 29.1 69.9 50.2
- 22. Unit Capacity Factor (Using DER Net) 28.1 67.7 48.6
- 23. Unit Forcei Outage Rate 24.8 6.1 34.7
- 24. Shutdowns SchedJ1ed Over Next 6 Months (Type, Date, and Duration of Each):
- 25. If Shut Down At End Of Report Period. Estimated Date of Startup:
OPERATING DATA REPORT DOCKET NO.
50-328 DATE 12/01/95 COMPLETED BY - T. J. Hollomon TELEPHONE (615) 843-7528 e
- OPERATING STATUS l Notes l
1.
Unit Name:
Seauovah Unit Two l-l 2.
Reporting Period: November 1995 l
l 3.
Licensed Thermal Power (Mdt): 3411.0 l
l 4.
Nameplate Rating (Gross HWe): 1220.6 l
l s
S.
Design Electrical Rating (Net MWe): 1148.0 l
l
- 6.
Maximum Dependable Capacity (Gross MWe): 1146.0 l
l
]
- 7.
Maximum Dependable Capacity (Net MWe): 1106.0 l
l 8.
If Changes Occur in Capacity Ratings (Item Numbers 3 Through 7) Since Last Report, Give Reasons:
9.
Power Level To Which Restricted, If Any (Not MWe):
N/A
- 10. Reasons For Restrictions, If Any:
N/A This Month Y r-t o-Date Cumulative
- 11. Hours in Reporting Period 720 8.016 118.345
- 12. Number of Hours Reactor Was Critical 720.0 7.518.7 71.875
- 13. Reactor Reserve Shutdown Hours 0
0 0
- 14. Hours Generator On-Line 720.0 7.404.1 70.113.8
- 15. Unit Reserve Shutdown Hours 0
0 0
- 16. Gross Thermal Energy Generated (MWH) 2.453.022.6 24.786.295.6 222.313.759
- 17. Gross Electrical Energy Generated (MWH) 852.070 8.449.393 75.457.002 1
- 18. Net Electrical Energy Generated (HWH) 824.614 8.148.357 72.262.539
- 19. Unit Service Factor 100.0 92.4 59.2
- 20. Unit Availability Factor 100.0 92.4 59.2
- 21. Unit Capacity Factor (Using MOC Net) 103.6 91.9 55.2
- 22. Unit Capacity Factor (Using DER Net) 99.8 88.5.
53.2
- 23. Unit Forced Outage Rate 0.0 7.6 33.0
- 24. Shutdowns Scheduled Over Next 6 Months (Type. Date, and Duration of Each):
i The Unit 2 Cvele 7 refuelina outaae is scheduled to beain Acril 19. 1996. with a duration of 55 davs.
- 25. If Shut Down At End Of Report Period, Estimated Date of Startup:
i I
a
DOCKET NO:
50-327 UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT NAME:
One DATE:
12/08/95 REPORT MONTH: November 1995 COMPLETED BY:T. J. Hollomon TELEPHONE:(615) 843-7528 Method of Licensee Cause and Corrective Action to Duration Shutting Down Event System Compgnent l
2 3
4 No.
Date Type (Hours)
Reason Reactor Report No.
Code Code Prevent Recurrence 5
951101 S
262.1 C
4 N/A N/A N/A Unit I was removed from the grid at 0123 EDT on September 9 for the Unit 1 Cycle 7 refueling outage.
The Unit 1 generator was tied to the grid on November 11 at 2205 EST ending the refueling outage.
b 6
951112 5
9.5 B
5 N/A N/A N/A Unit I was taken off-line on November 12 at 1058 EST for turbine overspeed testing. The Unit 1 generator was tied on-line again at 2030 EST that day.
7 951118 F
40.2 A
5 N/A N/A N/A On November 18 at 2049 EST. with Unit 1 operating at approximately 89 percent power. Unit 1 experienced a secondary plant transient. The transient began when the Unit 1 main turbine intercept valves for low pressure turbines
'A' and
'B' closed because of a spurious signal from a failed circuit card in the electro-hydraulic control system. The cause of the event was a single component failure of the reheat pressure / megawatt comparator card for the close intercept valve.
Corrective acticns for this event include disabling the protective circuit and replacing the failed card. The Unit 2 circuit was determined to already have been dis abl ed.
2 3
4 I: Forced Reason:
Method:
Exhibit G-Instructions F
S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data B-Maintenance or Test 2-Manual Scram Entry sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuation of Existing Outage (NUREG-1022)
E-Operator Training and License Examination 5-Reduction F-Administrative 9-Other 5
G-Operational Error (Explain)
Exhibit I-Same Source H-Other (Explain)
w
.- o.
DOCKET NO:
50-327 UNIT SHUTDOWNS AND POWER REDUCTIONS.
UNIT NAME:
One DATE:
12 A8/95
.e REPORT IONTH: November 1995 COMPLETED BY:T. J.
- 1amon.
TELEPHONE:(615)
Ki-7528 Method of Licensee Cause and Corrective Duration Shutting Down Event Systy C
ent Action to No.
.Date Type (Hours)
Reason Reactor-Report No.
Code Code Prevent Recurrence 8
951127 F
71.1 A
5 N/A N/A N/A-On November 27 at approximately 1340 EST. intermittent swings started on secondary plant instru-mentation channels. At 1512 EST.
i power decrease was initiated. and the turbine was manually tripped at 1527 EST. Arcing inside the exciter housing was observed.. A cable lug was in contact with the metal support for the resistor, and the insulation had worn through.
I It was determined that the cause of this event was the inadequate a
. installation of the jumper cables during a previous refurbishment of the exciter.. The other lugged terminations on the Unit 1 exciter and voltage regulator were inspected for proper clearance to grounded-surfaces and were found acceptable. The affected cable was replaced. Power increase was initiated on November 30.
2 3
4 I: Forced Reason:
Method:
Exhibit G-Instructions F
S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data B-Maintenance or Test 2-Manual Scram Entry sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuation of Existing Outage (NUREG-1022)
E-Operator Training and License Examination 5-Reduction F-Administrative 9-Other 5
G-Operational Error (Explain)
Exhibit I-Same Source H-Other (Explain)
r a.
DOCKET ND:
50-328
.tMIT SMITDOWNS AND POWER REDUCTIONS LMIT NAME; Two DATE:
12/0 MIS
'.. '.~
REPORT M) NTH: November 1995 COMPLETED BY:T..l.
He'
' aman
- ~
TELEPHONE:(615) SCH7528 Method of Licensee
.Cause and Corrective lC y t Duration Shutting Down Event' Systy Action to i
3 No.
Date Type (Hours)
Reason Reactor Report No.
Code Code Prevent Recurrence There were no outages or power reductions of greater than 20 percent to report during November.
I: Forced Reason:
Method:
Exhibit G-Instructions 2
3 4
F S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data B-Maintenance or Test 2-Manual ' Scram Entry sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuation of Existing Outage (MREG-1022)
E-Operator Training and License Examination 5-Reduction F-Administrative 9-Other 5
G-Operational Error (Explain)
Exhibit I-Same Source H-Other (Explain)
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