ML20078N513

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Monthly Operating Repts for Jan 1995 for Sequoyah Nuclear Plant Units 1 & 2
ML20078N513
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 01/31/1995
From: Hollomon T, Shell R
TENNESSEE VALLEY AUTHORITY
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9502150379
Download: ML20078N513 (11)
v • d • e


Text

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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) - JANUARY 1995 MONTHLY OPERATING REPORT Encli 3 is the January 1995 Honthly Operating Report as required by SQN Techn.6al Specification 6.9.1.10. -

If you have any questions concerning this matter, please call J. W. Proffitt at (615) 843-6651.

Sincerely, R, d, . JAM -

R. H. Shell Manager SQN Site Licensing Enclosure cca See page 2 i

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U.S. Nuclear Regulatory Commission Page 2 February 9, 1995 cc (Enclosure):

INPO Records Center Institute of Wuclear Power Operations 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 Rockville, Maryland 20852-2739 Mr. Joseph Santucci, Manager Advanced Reactor Department Electric Power Research Institute 3340 Hillview Avenue Palo Alto, California 94304 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administration U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 Mr. F. Yost, Director Research Services Utility Data Institute 1200 G Street, NW, Suite 250 Washington, D.C. 20005 7

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TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT MONTHLY OPERATING REPORT TO THE NUCLEAR REGULATORY COMMISSION JANUARY 1995 UNIT 1 DOCKET NUMBER 50-327 LICENSE NUMBER DPR-77 UNIT 2 DOCKET NUMBER 50-328 LICENSE NUMBER DPR-79

OPERATIONAL

SUMMARY

JANUARY 1995 UNIT 1 Unit I generated 884,860 megawatthours (MWh) (gross) electrical power during January with a capacity factor of 103 percent. Unit 1 operated at near 100 percent power throughout the month of January.

UNIT 2 Unit 2 generated 752,983 megawatthours (MWh) (gross) electrical power during January with a capacity factor of 88.3 percent.

On January 5 at 0015 Eastern standard time (EST), with Unit 2 operating at 100 percent reactor power, an automatic turbine trip and subsequent reactor trip o?.urrm' Tne signal was generated by the gas-operated relay on the C-phace :On Sank transformer. Operation of the gas-operated .w)sy resulte, when the control room operator attempted to remove the lens c.wer of + ooling group indication light that was not lit following rece;$ in; an 'larm regarding the cooler group operation.

When the lens cover was rotated, the control power for the main bank transformer cooler group shorted, resulting in the cycling of the pumps in both cooler groups. This resulted in a pressure surge in the transformer cooling oil which operated the gas operated relay.

Subsequent to the trip, Unit 2 entered Mode 3.

The Unit 2 reactor was taken critical again on January 5 at 2235 EST and was tied online on January 6 at 0956 EST. Unit 2 was again operating at 100 percent reactor power on January 8 at 2320 EST.

Unit 2 was manually removed from the grid on January 13 at 2113 EST as a result of a hot spot on the A-phase main transformer. The reactor power was maintained at approximately 28 percent while maintenance was performed. Unit 2 was tied online on January 15 at 0102 EST and reached 100 percent reactor power at 2130 EST that same day.

Unit 2 operated at near 100 percent reactor power through the remainder of January.

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AVERAGE DAILY UNIT POWER LEVEL DOCKET No. 50-327 UNIT No. One DATE: 02-02-95 COMPLETED BY T. J. Ho11omon TELEPHONE: (6151 843-7528 MONTH: JANUARY 1995 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL ph1 (MWe-Neti Rh1 (MWe-Net) 1 3154 17 1153 2 1154 18 1148 3 1154 19 1151 4 1151 20 1151 5 1152 21 1152 6 1154 22 1154 7 1158 23 1147 8 1157 24 _L] 49 i

9 1151 25 1150 10 1156 26 1152 11 1157 27 1152 12 1152 28 1148 13 1153 29 1152 14 1152 30 1150 15 1156 31 1149 16 1152

--.. . + . . _ ~ _ . - . . . . . . ..- . _ ~ . . - ~ . - _ = - . . ~ . .

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. l AVERACE DAILY UNIT POWER LEVEL DOCKET NO. 50-328 UNIT No. Two DATE: 02-02-95 l i

COMPLETED BY: T. J. Hollomon TELEPHONE: f615) 843-7528 l I

MONTH: JANUARY 1995 i

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AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL l R&1 (MWe-Net) Rh1 (MWe-Net)  !

1 1143 17 1146 2 1146 18 1142 3 1143 19 1142 4 1141 20 1144 5 -22 1

. 1144 6 125 22 1144 i

1 7 282 23 1144 8 795 24 1142 t 9 1139 25 1143 10 1142 26 1142 ,

11 1139 27 1144  ;

12 1139 28 1143 13 849 29 1142 1

14 -37 30 1142 ,

b 15 652 31 1143 '

16 1139 I

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OPERATING DATA REPORT DOCKET NO. 50-327 DATE 02/02/95 COMPLETED BY T. J. Ho' lomon TELEPHONE (615) 84'.L-7528 i

OPERATING STATUS  !

l l Notes l

1. Unit Name: Seauovah Unit One l l
2. Reporting Period: January 1995 l l
3. Licensed Thermal Power (Wt): 3411.0 l l
4. Nameplate Rating (Gross We): 1220.6 l l  ;
5. Design Electrical Rating (Net We): 1148.0 l l
6. Maximum Dependable Capacity (Gross We): 1151.0 l l
7. Maximum Dependable Capacity (Net We): 1111.0 l l
8. If Changes Occur in Capacity Ratings (Item Numbers 3 Through 7) Since Last Report, Give Reasons:  ;

i

9. Power Level To Which Restricted, If Any (Net We): N/A i
10. Reasons For Restrictions, If Any: N/A i This Month Yr-to-Date Cumulative  !
11. Hours in Reporting Period 744 744 119.113 }
12. Number of Hours Reactor Was Critical 744.0 744.0 62.794 ,
13. Reactor Reserve Shutdown Hours 0 0 0 6
14. Hours Generator On-Line 744.0 744.0 61.348.3 ,
15. Unit Reserve Shutdown Hours 0 0 0 l
16. Gross Thermal Energy Generated (WH) 2.533.903.4 2.533.903.4 200.109.900 >
17. Gross Electrical Energy Generated (WH) 884.860 884.860 67.935.744 l
18. Net Electrical Energy Generated (WH) 857.686 857.686 65.121.099  ;
19. Unit Service factor 100.0 100.0 51.5 l
20. Unit Availability Factor 100.0 100.0 51.5
21. Unit Capacity Factor (Using MDC Net) 103.8 103.8 49.2 ,
22. Unit Capacity Factor (Using DER Net) 100.4 100.4 47.6 ;
23. Unit Forced Outage Rate 0.0 0.0 36.4
24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each): ,
25. If Shut Down At End Of Report Period, Estimated Date of Startup:

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i OPERATING DATA REPORT DOCKET NO. 50-328 DATE _D2/02/95 COMPLETED BY T . J . Ho11 omon TELEPHONE (615) 843-7528 OPERATING STATUS l Notes l

1. Unit Name: Seouovah Unit Two l l
2. Reporting Period: January 1995 l l
3. Licensed Thermal Power (MWt): 3411.0 l l
4. Nameplate Rating (Gross Mde): 1220.6 l l 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 (Net HWe): N/A
10. Reasons For Restrictions, If Any: N/A This Month Yr-to-Date Cumulative -

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11. Hours in Reporting Period 744 744 111.073
12. Number of Hours Reactor Was Critical 721.7 721.7 65.078
13. Reactor Reserve Shutdown Hours 0 0 0
14. Hours Generator On-Line 682.7 682.7 63.392.4
15. Unit Reserve Shutdown Hours 0 0 0
16. Gross Thermal Energy Generated (MWH) 2.198.286.6 2.198.286.6 199.725.749
17. Gross Electrical Energy Generated (MWH) 752.903 752.983 67.760.592
18. Net Electrical Energy Generated (MWH) 723.807 723.807 64.837.989
19. Unit Service Factor 91.8 91.8 57.1
20. Unit Availability Factor 91.8 91,8 57.1
21. Unit Capacity Factor (Using MDC Net) 88.0 88.0 52.8
22. Unit Capacity Factor (Using DER Net) 84.7 84.7 50.8
23. Unit Forced Outage Rate 3.2 3.2 34.9
24. Shutdowns Scheduled Over Next 6 Months (Type Date, and Duration of Each):
25. If Shut Down At End Of Report Period, Estimated Date of Startup:

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DOCKET NO: 50-328

  • UN W SHUTDOWNS AND POWER REDUCTf0NS UNIT NAME: Two DATE: 02/02/95 REPORT MONTH: January 1995 COMPLETED BY:T. J. Ho' lomon TELEPHONE:(615) 80-7528 .

Method of Licensee Cause and Corrective .

Durati on Shutting Down Event System Compgnent Action to 4

No. Date Type l (Hours) Reason 2

Reactor 3 Report No. Code Code Prevent Recurrence 1 950105 F 33.7 A 3 328/95001 IU IL On January 5 at 0015 EST. with Unit 2 operating at 100 percent reactor power, an automatic turbine and reactor trip occurred. The gas relay tripped the main transformer, resulting in subsequent turbine and reactor trips. The cause of this event was a failure to design the light socket installation with an adequate barrier to prevent an electrical short f rom occurring.

The electrical short resulted in the cycling of the transformer cooler group pumps and the actua-tion of the gas-operated relay. The Unit 2 and comon control room panel lamp sockets were intpgeted to ensure that they were properly installed. Eight deficiencies were identified and corrected. A preventive maintenance instruction will be developed to periodically check the tightness of control room light sockets. The Unit 1 control room sockets will be checked during the next refueling outage.

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I:F Forced Reason: Method: Exhibit G-Instructions 5: 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 Restruction 4-Continuation of Existing Outage (NUREG-1022)

E-Operator Training and License Exanination 5-Reduction F-Admini s trative 9-Other S

G-Operational Error (Explain) Exhibit I-Same Source H-Other (Explain)

7 DOCKET NO: 50-328 ,

UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT NAME: Two DATE: 02/02/95 .

REPORT MONTH: January 1995 COMPLETED BY:T. J. Hollomon TELEPHONE:(615) 843-7528

  • Method of Licensee Cause and Corrective e Duration Shutting Down Event Systy Compgnent Action to No. Date Type (Hours) Reason Reactor Report No. Code Code Prevent Recurrence .

2 950113 F 27.6 B 5 N/A N/A N/A Unit 2 was removed from the grid on January 13 at 2113 EST as a result of a hot spot on the A-phase bus bushing connection. The A-phase transformer was removed from service, and the spare trans-former was placed in service. The bushing will be repaired or replaced as appropriate.

2 3 4 I:F Forced Reason: Method: Exhibit G-Instructions 5: 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 Restruction 4-Continuation of Existing Outage (NUREG-1022)

E-Operator Training and License Examination 5-Reduction F-Administrative 9-Other G-Operational Error (Explain) 5 Exhibit I-Same Source H-Other (Explain)

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