ML20210K578

Monthly Operating Rept for Jul 1997 for Sequoyah Nuclear Plant

ML20210K578
Person / Time
Site:	Sequoyah
Issue date:	07/31/1997
From:	Holloman T, Salas P TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9708190309
Download: ML20210K578 (10)

Text

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e YA fennessee Yahey Authonty Post ONce Bom 2000, Soddy Da ny. Temessee 17379 August 13, 1997

-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) - JULY 1997 MONTHLY OPERATING REPORT.

Enclosed is the July 1997 Monthly Operating Report as required by SON Technical-Specification 6.9.1.10.

If you have any questions concerning this matter, please telephone me at (423) 843-7170 or James D. Smith at (423) 843-6672.

Sincere y, Mn k

Pedro Salas Site Licensing.and Industry Affairs Manager Enclosure

cc: See page 2 '

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9708190309 970731 PDR ADOCK 05000327-R PDR 10bb .

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U,.S.: Nuclear Regulatory Commission

- Page 2' August 13, 1997 cc (Enclosure):

Mr. R. W. Hernan, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North ll555'Rockville Pike Rockville, Maryland 20852-2739 INPO Records Center Institute of Nuclear Power Operations 700 Galleria Parkway Atlanta, Georgia 30339-5947 Ms. Barbara Lewis, Assistant Editor, Database McGraw-Hill, Inc.

1200 G Street, NW, Suite 1100 Washington, D.C. 20005 Mr. James Lang, 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 .3.7379-3624 Regional Administrator ,

U.S. Nuclear Regulatory Commission Region II Atlanta Federal. Center.

61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia'30323-3415 l

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e d e TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT MONTHLY OPERATING REPORT TO THE NUCLEAR REGULATORY COMMISSION JULY 1997 UNIT 1 DOCKET NUMBER 50-327 LICENSE NUMBER DPR-77 UNIT 2 DOCKET NUMBER 50-328 LICENSE NUMBER DPR-79

A OPERATIONAL

SUMMARY

JULY 1997 UNIT 1 Unit'l generated 867,614 megawatthours (MWh) (gross) electrical power during_ July with:a_ capacity factor of 100.9 percent. Unit 1 was-operating at-100 percent power at the end of July.

UNIT 2 Unit 24 generated 810,422 MWh (gross) electrical power during July with a capacity factor of 94.31-percent. On July 3 at 1530 EDT, an alarm was freceived on a high gas pressure on the.C main bank transformer.

Preliminary samples indicated a high level of combustibles. On July 4 at 0013-EDT,1 Operations initiated a power reduction. Following additional sampling,-indicating an acceptable level of combustibles, Operations l

Linitiated a power increase on July 4 at 1855 EDT. Samples were taken l

hourly during power _ escalation and twice daily once the unit reached steady state. Unit 2 was operating at 100 percent power on July 5 at 1030 EDT.-

On July 20 at 1239 EDT, an alarm was again received on high gas pressure on C phase main bank transformer. TVA decided to decrease reactor power

..to_approximately 20 percent and remove the-generator from the grid.

Unit-2 generator was taken off-line at 2322 EDT that day.- A stand-by main transformer was placed11n service, sand Unit 2 was tied online at 1940 EDT-on July 21. Unit 2 reached 100 percent power on July 23 at 0224-

.EDT.

-Unit 2 was operating at 100 percent reactor power at.the end of July.

SUMMARY

OF POWER-OPERATED RELIEF VALVES (PORVs) AND SAFETY VALVES CHALLENGES No PORVs or-safety valves were challenged in-July. I

AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-327 UNIT NO. One DATE: 08-05-97 COMPLETED BY: T. J. Hollomon TELEPIIONE: (423) 843-7528 MONTil: JULY 1997 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL DAY (MWe-Net) DAY (MWe-Net)

I 1131 17 1133 2 1132 18 1131 3 1134 19 1118 4 1132 20 1123 5 1132 21 1124 6 1130 22 1126 7 1133 23 1125 8 1133 24 1127 9 1135 25 1127 10 1133 26 1125 11 1133 27 1122 12 1133 28 1121 13 1132 29 1119 14 1130 30 1118 15 1129 31 1117 16 1131 l

l

_____s

~

AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-328 UNIT NO. Two DATE: 08-05-97 COMPLETED BY: T. J. Ilollomon TELEPHONE: (423) 843-7528 MONTil: JULY 1997 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL DA}' (MWe-Net) DAY (MWe-Net)

I 1125 17 1125 2 1126 18 1123 3 1128 19 1120 4 749 20 893 5 1101 21 24 6 1122 22 774 7 II26 23 1107 8 ,

1126 24 1113 9 1128 25 1117 10 1127 26 1115 11 1127 27 1112 12 1126 28 1111 13 1125 29 1110 14 1123 30 1108 15 1122 31 1109 16 1123 l

l

, OPERATING DATA REPORT DOCKET NO. 50-327 DATE 08/05/97 COMPLETED BY T. J Hollomon TELEPHONE (423) 843-7528 QlERATING STATUS

1. Unit Name: Ecouoyah Unit One

2. Reporting Period: July 1997

3. Licensed Thermal Power (MWt): 3411.0

4. Nameplate Rating (Gross (MWe): 1220.6 5 Design Electrical Rating (Net MWe): 1148.0

6. Maximum Dependable Capacity (Gross MWe): 1155.0

7. Maximum Dependable Capacity (Net MWe): 1117.0

8. If Changes Occur in Capacity Ratings (Item Numbers 3 Through 7) Since Last Report, Give Reasons:

l 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 i1. Hours in Reporting Period 744 5.087 141.000

12. Number of Hours Reactor Was Critical 744.0 3.885.3 81,208

13. Rea-tor Reserve Shutdown Hours 0 0 0

14. Hours Generator On-line 744.0 3,848.3 79,419.9

15. Unit Reserve Shutdown Hours 0 0 0

16. Gross Thermal Energy Generated (MWh) 2,535,120.0 12,512,796.1 258,867,783

17. Gross Electrical Energy Generated (MWh) 867,614 4,340,837 88,132,977

18. Net Electrical Energy Generated (MWh) 839,862 4,188,737 84,566,375

19. Unit Service Factor 100.0 75.6 56.3

20. Unit Availability Factor 100 0 75,6 56.3

21. Unit Capacity Factor (Using MDC Net) in! 1 73.7 53.7

22. Unit Capacity Factor (Using DER Net) 98.3 71.7 52.2

23. Unit Forced Outage Rate 0.0 0.0 31.0

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:

o

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., OPERATING DATA REPORT DOCKET NO. 50-328 DATE 08/05/97 COMPLETED BY T.1 Hollomon TELEPHONE (423) 843-7528 QPERATING STATilS

1. Unit Name: Sequoyah Unit Two

2. Reporting Period: July 1997

3. Licensed Thermal Power (MWt): 3411.0 4, Nameplate Rating (Gross (MWe): 1220.6

5. Design Electrical Rating (Net MWe): 1148.0

6. Maximum Dependable Capacity (Gross MWe): 1155.0

7. Maximum Dependable Capacity (Net MWe): 1117.0

8. If Changes Occur in Capacity Ratings (Item Numbers 3 Through 7) Since Last Report, Give Reasons:

l

9. Power Level to Which Restricted, if Any (Net MWe): N/A

10. Reasons for Restrictions, if Any: N/A i

This Month Yr.-to-Date Cumulative i1. Ilours in Reporting Period 744 5,087 132,960

12. Number of Hours Reactor Was Critical 744.0 5,087.0 84,689

13. Reactor Reserve Shutdown Hours 0 0 0 W

14. Hours Generator On-Line 723.7 5,066.7 82,739.2

15. Unit Reserve Shutdown Hours 0 0 0

16. Gross Thermal Energy Generated (MWh) 2,405,695.2 -17,025,921.5 264,765,575 17, Gross Electrical Energy Generated (MWh) 810,422 5,861,031 90,060,088  ;

- 18. Net Electrical Energy Generated (MWh) 783,350 5,668,507 86,3?S,226

19. Unit Sersice Factor 97.3 99.6 62.2

20. Unit Availability Factor 07 1 99 6 62.2

21. Unit Capacity Factor (Using MDC Net) 94.3 99.8 58 1

22. Unit Capacity Factor (Using DER Net) 91.7 97.1 56.6

23. Unit Forced Outage Rate 2.7 04 29.9

24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each): Unit 2 Cycle 8 Refueling Outage is scheduled to begin in October 3.1997. with a duration of 40 days.

25. If Shut Down At End of Report Period, Estimated Date of Startup: N/A

1

.* i DOCKET NO.: ..50-327 ~

UNTTNAME: One .

i DATE- onmM7 . *--

UNIT SHUTDOWNS AND POWER REDUCTIONS .

COMPLETED BY: T. J. Hana-de REPORT MONTH: J' ULY 1997 TELEPHONE. ' (423) 843-7528 No Date _ Type' Outage Reason Method of Licensee System Component Cause and Correctne Actica to Present Duration ' Shutting ; Estnt Report -Code' Code' Recurrence

- (Hours) J Down No.

Reactor' There were no outages or power reductions of greater than 20 percent during July. -

'F: Forced 2

Reason. Method ' Exhibit G-Instructions

- l-Manual for Preparation ofData S: Scheduled A-Equipment Failure (Explain)

B-Maintenance or Test 2-Manual Scram Entry sheets for Licensce C-Refueling 3-Automatic Scram Estnt Report (LER) File D-Regulatory Restriction .

4-Continuation ofExisting Outage (NUREG-1022)

E-Operator Training and License Exam 5-Reduction 5

F-Administrative _ _

9-Other Exhiht I-Same Source G-Operational Error (Explain)

H-Other (Explain) -

- - - - - - - - - - - - = . - - -

. . . _ . . . _ . < - .n

DOCKET NO.: 50-328 '

UNTT NAME: Tuo' -

UNIT SHIJTDOWNS AND POWER REDUCTIONS DATE- 07/07/97 .

COMPLETED BY: T. J. Hollensa REPORTMONTIL JULY 1997 TELEPHONE- (423) 843-7528 Cumyvicil Cause and Correctist Action to Protut No. Date T3pe l Outage Reason

• Method of Licensee System Duration Shutting Estnt Code

• Code' R-mu (Hours) Down Report No.

Reactor' 3 970704 F A 5 N/A N/A N/A On July 3, an alarm was receised on a high gas pressure on the C main bank transformer Prehminan samplesindicated a high level of combustibles. On July 4, Operations initiated a power reduction.

Following additional sampling. it was determined that the lesel of combustibles was acceptable and a power increase was initiated. Samples were taken hourly during power escalation and twice daily once the unit reached steady state. The Icvel of combustibles remained acceptable.

4 970720 F 20.3 A 2 N/A N/A N/A On July 20, an alarm was again reccised on transformer gas pressure abnormal .A power reduction was initiated and the generator was removed from senice. A standby transformer was placed in senice, and Unit 2 was tied online on July 21. An inspection and evaluation of the transformer are being performed to determine the cause of the high level of combustibles and the correctist actions.

'F: Forced 2

Reason: 41ethod ' Exhibit G-Instructions S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data B-Maintenance or Test 2-Manual Scram Entn sheets for Licensce C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuation of Existing Outage (NUREG-1022)

E-Operator Training and License Exam 5-Reduction F-Administrative 9-Other T.xhibit 1 - Same Source G-Operational Error (Explain)

H-Other (Explain)

_