ML20083L248

Monthly Operating Repts for Apr 1995 for Sequoyah Nuclear Plant

ML20083L248
Person / Time
Site:	Sequoyah
Issue date:	04/30/1995
From:	Holloman T, Shell R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9505180226
Download: ML20083L248 (11)

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Tennes<4e Valley Authonty, Post Othce Box 2000 Soddy Daisy Tennessee 37379 i

Y May 12, 1995

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U.S. Nuclear Regulatory Conunission 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) - APRIL 1995 MONTHLY OPERATING REPORT Enclosed is the April 1995 Monthly 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, f, N.

R. H. Shell ,

Manager SQN Site Licensing Enclosure ec: See page 2 l

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9505180226.950430 '

i PDR ADOCK 05000327 t i l R Pm I i

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U.S. Nuclear Regulatory Commission Page 2 May 12, 1995 cc (Enclosure):

INPO Records Center Institute of Nuclear 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 l Electric Power Research Institute 1 3340 Hillview Avenue j Palo Alto, California 94304 l

NRC Res'ident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 Mr. F. Yost, Director desearch Services

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Utility Data Institute '

1200 G Street, NW, Suite 250 l

Washington, D.C. 20005 i

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TEMFSSEE VALLEY AUTHORITY SEQUOYAH NUCIRAR PLANT s

NGITELY OPERATING REPORT i TO TEE '

NUC12AR REGUIATORY CGWIISSIM ,

ARRIL 1995 5

UNIT 1 DOCEET NMBER 50-327 LICMSE NIMBER DPR-77 UNIT 2 DOCEET NIMBER 50-328 LICENSE NIMBER DPR-79 i

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t OPERATIONAL

SUMMARY

APRIL 1995 IWlL1 Unit 1 generated 850,300 megawatthours (MWh) (gross) electrical power during April with a capacity factor of 102.7 percent. Unit 1 operated at near 100 percent power during April.

Mil L 2 Unit 2 generated 232,890 megawatthours (NWh) (gross) electrical power during April with a capacity factor of 28.3 percent. On March 8, 1995, Unit 2 experienced a leak on the 6B extraction steam line inside the condenser. The leak caused the pressure in the 6B feedwater heater to drop 20 percent. On April 3, the 6B level control valve was noted to be near full open, and a " roar" in the "B" condenser was discovered. This was an indication that the leak size had increased. A subsequent water hammer occurred on the AB drain to the 5B heater, resulting in a valve body failure. The unit was taken off-line. An inspection of the "B" condenser identified that four of the six No. 5 extraction bellows, both No. 6 extraction bellows, and one No. 7 extraction bellows were damaged.

A similar extent of condition was identified on the "A" and "C" condensers when they were inspected.

Af ter repairs were completed, Unit 2 was taken critical on April 23 at 0245 EDT and was tied to the grid on April 24 at 1153 EDT. Unit 2 was operating at 99 percent on April 27 at 2113 EDT.

On April 28,1995, at 2031 EDT, an automatic turbine and subsequent reactor trip was generated by the main generator neutral overvoltage relay. The cause of the trip has been attributed to a bus duct gasket )

that came loose and came in contact with the energized electrical bus 1 leading from the main generator to the C phase, designated spare, main transformer. The gasket provided a path for electrical leakage to ground that was sensed by the main generator neutral overvoltage relays terminating electrical generation.

Unit 2 was taken critical on April 30 at 1459 EDT and was at I approximately 14 percent reactor power at the end of the month. The l Unit 2 generator remained off-line at the end of April.

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AVERACE MILY INIT F0WER IAVEL DOCKET NO. 50-327 UNIT No. One DATE: 05-04-95 COMPLETED BY: T. J. Hollomon TELEPHONE: (615) 843-7528 L

MONTH: APRIL 1995 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL DAY (MWe-Net) DAY (MWe-Net) 1 1149 17 1141 2 1150 18 1140 3 1143 19 1139 i

4 1145 20 1147 j 5 1146 21 1145 6 1147 22 1134 )

7 1146 23 1147 8 1144 24 1143 9 1144 25 1146  :

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10 1147 26 1146  !

11 1144 27 1146 12 1141 28 1146 13 1143 29 1144 14 1140 30 1146 15 1142 31 N/A 16 1140 l

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AVERACE MILY IEtIT F0WER LEVEL

-DOCKET NO. '50-328 UNIT No. Two DATE: 05--04-95 COMPLETED BY: I. J.'Ho11omon' TELEPHONE: (615) 843-7528 MONTH: APRIL 1995 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL DAY' (MWe-Net) DAX (MWe-Net) 1 1120 17 -7 2 1112 18 -9 3 1121 19 -12 4 1114 20 -33 5 1087 21 -35'

'6 54 22 -35 7 -35 23 -37~

8 -2 24 68 9 -2 25 367 r

10 -2 26 944 4

11- -2 27 1018 12 -7 28 948 13 -2 29 -35 14 -7 30 -35 15 -2 31 N/A 16 -5 J

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OPERATING DATA REPORT DOCKET NO. 50-327 DATE 05/04/95 COMPLETED BY T. J. Hollomon TELEPHONE f615) 843-7528 OPERATING STAT.U3 l Notes l

1. Unit Name: ._iggggvah Unit One l l

2. Reporting Period: Acril 1995 l l

3. Licensed Thermal Power (HWt): .3411.0 l l ,

4. Nameplate Rating (Gross HWe): 1220.6 l l S. Dealgn Electrical Rating (Net HWe): .1148.0 l l

6. Maximum Dependable Capacity (Gross HWe): 1151.0 l l

7. Maximum Dependable Capacity (Net HWe): 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 HWe): N/A l

10. Reasons For Restrictions, If Any: N/A l

This Month Yr-to-Date Cumulative ,

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11. Hours in Reporting Period 719 2.879 121.248

12. Number of Hours Reactor Was Critical 719.0 2.682.6 64.732

13. Reactor Reserve Shutdown Hours 0

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14. Hours Generator On-Line 719.0 2.668.2 63.272.5 j

15. Unit Reserve Shutdown Hours 0 0 0 l

16. Gross Thermal Energy Generated (HWH) 2.449.344.6 8.882.142.2 206.458.139

17. Gross Electrical Energy Generated (HWH) 850.300 3.093.260 70.144.144

18. Net Electrical Energy Generated (HWH) 822 665 2.988.150- 67.251.563

19. Unit Service factor 100.0 92.7 52.2

20. Unit Availability Factor 100.0 92.7 52.2 I

21. Unit Capacity Factor (Using HDC Net) 103.0 93.4 49.9

22. Unit Capacity Factor (Using DER Net) 99.7 90.4 48.3 l

23. Unit Forced Outage Rate 0.0 7.3 35.8

24. Shutdowns Scheduled Over Next 6 Honths (Type. Date, and Duration of Each):

The Unit 1 Cycle 7 refuelino outaae is scheduled to beoin Sectember 9.1995. with a duration of Sl days.

25. If Shut Down At End Of Report Period, Estimated Date of Startup:

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OPERATING DATA REPORT DOCKET NO. 50-328 DATE 05/04/95 COMPLETED BY U d gljomon -

TELEPHONE [615) 843-7528 OPERATING ST,i_21

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1. Unit Name: Seouoyah 18 nit Two l l

2. Reporting Period: Acril 1995 l l' ,

3. ' 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 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 MWe): N/A

10. Reasons for Restrictions, If Ar.y: N/A i

This Month Yr-to-Date Cumulative

11. Hours in Reporting Period 719 2.879___ 113.208 l

12. Number of Hours Reactor Was Crtlical 272.0 2.409.7 66.766

13. Reactor Reserve Shutdown Hours 0 ~0 0

14. Hours Generator On-Line 229.2 2.327.9 65037.6

15. Unit Reserve Shutdown Hours 0 0 0

16. Gross Thermal Energy Generated (MWH) 675.051.7 7.649.783,Q_ 205.177.252

17. Gross Electrical Energy Generated (MWH) 232.890 2.631.293 69.638.902

18. Net Electrical Energy Generated (MWM) 215.250 2.529.289 66.643.471 I

19. Unit Service Factor 31.9 80.9 57.4

20. Unit Availability Factor 31.9 80.9 57.4

21. Unit Capacity Factor (Using MDC Net) 27.1 79.4 53.2

22. Unit Capacity Factor (Using DER Net) 26.1 76.5 51.3

23. Unit forced Outage Rate 68.1 19.1 34.7 1

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: .The generator was tied-on_line on May 1. 1995.

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DOCKET N0: ~50-127- " '

UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT MAME: One .

"J DATEi 05/04/95 . - '

REFORT MONTH: April 1995 COMPLETED BY:T. J. Holleman -

TELEPHONE:(6151 843-7528 .

(. l-g Method of Licensee . C.use and Corrective-Duration Shutting Down Event System Component Action to Date Tyoe l Reason 2 Reactor 3 d 5

. Prevent Recurrence No. (Hours) Report No. Code Cade There were no outages or power ,

reductions'of greater than 20-i percent to report during April.

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i I:F Forced 2 Reason: hthod: kxhibit G-Instructions .

A-Equipment Failure (Explain)--

• S: Scheduled "qal for Preparation of Data B-Maintenance or Test ' Scram Entry sheets for Licensee-C-Refueling 3 . tic Scram Event Report (LER) File

.D-Regulatory Restruction 4-Ccatinuation of. Existing Outage '(NUREG-1022)

E-Operator Training and License Examination 5-Reduction F-Administrative 9-Other 90perational Error (Explain) 5 Exhibit I-Same Source H-Other (Explain) ,

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_.s_-_-_.__i_____m ._*r .4---m-_m _.__4....e_., . _ - . _ _

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DOCKET NO: 50-328 UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT NAME: Two DAVE: 05/04/95 .

REPORT MONTH: April 1995 COMPLETED BY:T. J. Hollomon TELEPHONE:f615) 843-7528 ,

Method of Licensee Cause and Corrective Duration Shutting Down Event System Component Action to l 2 Reactor 3 Report No. S Prevent Recurrence No. Date Type (Hours) Reason Code Code 3 950406 F 438.35 B/A 1 N/A BLL SG On March 8, Unit 2 experienced a leak on the 68 extraction. On April 3 the 6B level control valve was noted to be near full open, and a " roar" in the "B" condenser was discovered. This was an indication that the leak size increased. A subsequent water hammer occurred on the 48 drain to the 58 heater, resulting in a valve body failure.

The unit was taken off-line.

Several extraction bellows were determined to be damaged in each of the three condensers. The cause of the bellows damage was determined to be cycle fatigue. The bellows and valve were replaced. The unit "

was returned to power operation.

4 950428 F 51.48 A 3 50-328/95002 N/A FK On April 28, at 2031 EDT with Unit 2 operating at 99 percent power, an automatic turbine and subsequent reactor trip was generated by the main oenerator neutral overvoltage relay. The cause of the trip has been attri-buted to a bus duct gasket that came loose and came in contact with the energized electrical bus leading f rom the main generator to the C phase, designated spare, main transformer. The gasket provided a path for electrical leakage to ground that was sensed by the relays terminating electrical oene ra ti on .

2 Reason: 3 #

I:F Forced Method: Exhibit G-Instructions S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data B-Naintenance 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 5

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

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.a DOCKET NO: 50 128 ..,

UNIT SHUTDOWNS AND POW R REDUCTIONS UNIT NAME: Two *' '- '

-DATE: 05/04/95 REPORT MONTH: April 105__ COMPLETED BY:T. J. Hollaman: . ..

TELEPHONE:(6151 843-7528 , ,

Method of Licensee Cause and Corrective Duration Shutting Down Event- System Component Action to 4

No. Date TypeI - (Hours) Reason 2 Reactor 3 Report No. Code Code 0 Prevent Recurrence 4 950428 F 51.48 A 3 50-328/95002 N/A FK- (continued)

The gasket was repaired. . The preventive maintenance instructions will. be revised to provide clear -

. inspection criteria for the gaskets. The unit was taken criti-cal on April 30 at 1459 EDT, entered Mode 1 at 1928 EDT, and was at approximately 14 percent reactor power at the end.of the month.

Unit 2 remained off-line at the end of April.

2 Reasen: 3 4 I:F Forced Method: Exhibit G-Instructions' S: Scheduled A-Equipme.;t 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 i D-Regulatory Restruction 4-Continuation of Existing Outage (NUREG-1022)

E-Operator Training and License Examination. 54 eduction i F-Administrative 9-Other S

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

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