ML20153B088

Monthly Operating Repts for Aug 1998 for Sequoyah Nuclear Plant.With

ML20153B088
Person / Time
Site:	Sequoyah
Issue date:	08/31/1998
From:	Hollomon T, Salas P TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9809220321
Download: ML20153B088 (10)

Text

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yg Tennesue Valley Authonty Post Office Box 2000 Soddy Daisy Tennessee 37379 September 14, 1998 1

i U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 j l

Gentlemen: 1 1

In the Matter of ) Docket Nos. 50-327 I Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PIANT (SON) - AUGUST MONTHLY OPERATING REPORT The enclosure provides the August Monthly Operating Report as required by SON Technical Specifications Section 6.9.1.10. l If you have any questions concerning this matter, please call me at (423) 843-7170 or J. D. Smith at (423) 843-6672.

Sincerel ,

j Pedro Salas Licensing and Industry Affairs Manager Enclosure /

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I U.S. Nuclear Regulatory Commission

'Page 2 September 14, 1998 I

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- cc (Enclosure):

Mr. R. W. Hernan, Senior Project Manager U.S. Nuclear Regulatory Commission l One White Flint, North l 11555 Rockville Pike Rockville, Maryland-20852-2739 i

INPO Records Center Institute of Nuclear Power Operations 700 Galleria Parkway Atlanta, Georgia 30339-5947 )

1 Ms. Barbara Lewis, Assistant Editor, Database l McGraw-Hill, Inc.

1200 G Street, NW, Suite 1100 Washington, D.C. 20005 Mr. James Lang, Manager Advanced Reactor. Department i Electric Power Research Institute i 3340.Hillview Avenue Palo Alto, California 94304 i NRC Resident Inspector  !

Sequoyah Nuclear Plant l 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624  ;

Regional Administrator U.S. Nuclear Regulatory Commission Region II Atlanta 1 Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, Georgia 30303-3415 f

I m y. , _

l. i ENCLOSURE l l

l TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT (SQN) l t

MONTHLY OPERATING REPORT AUGUST 1998 I l

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UNIT 1 DOCKET NUMBER 50-327 LICENSE NUMBER DPR-77 UNIT 2 DOCKET "JMBER 50-328 LICENSE NUMBER DPR-79

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i OPERATIONAL SU14fARY AUGUST 1998

! I. SEQUOYAH OPERATIONAL

SUMMARY

UNIT 1 Unit 1 generated 812,784 megawatthours (MWh) (gross) l electrical power during August with a capacity factor of l 94.1 percent. There were no outages or power reductions of greater than 20 percent in the average daily power level during August. Unit 1 entered coastdown to the Unit.1 Cycle 9 refueling outage on August 12 at 0021 eastern daylight time (EDT). Unit 1 was operating at 86

. percent power at the end of August and was continuing coastdown.

UNIT 2 Unit 2 generated 748,445 MWh (gross) electrical power during August with a capacity factor of 87.0 percent.

Unit 2 experienced an unplanned automatic scram on-August 27 at 1357 EDT as the result of a failure of a sudden pressure relay located on the 'B' phase main transformer. Disassembly of the relay determined that one rocker arm pin had worn to the degree that proper operation of the device was prevented. The pin failure mechanism appears to be wear (fretting). The failure resulted in actuation of the relay and the unit trip.

Unit 2 entered Mode 3. Unit 2 was tied online on August 30 at 1903 EDT.

Unit 2 was operating at 97.5 percent power and increasing at the end of August.

II. CHALLENGES TO THE PRESSURIZER POWER-OPERATED RELIEF VALVES (PORVs) OR PRESSURIZER SAFETY VALVES No PORVs or safety valves were challenged in August.

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AVERAGE DAILY UNIT POWER LEVEL l

DOCKET NO. 50-327 UNIT NO. ONE DATE: September 9, 1998 l COMPLETED BY: Tanya J. Hollomon TELEPHONE: (423) 843-7528 l

MONTH: AUGUST 1998 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL DAY (MWe-Net) DAY (MWe-Net)

1. 1121 17. 1064

2. 1119 18. 1054

3. 1116 19. 1049

4. 1118 20. 1014

5. 1115 21. 999

6. 1114 22. 999

7. 1109 23. 1015

8. 1107 24. 1004

9. 1106 25. 1003

10. 1108 26. 989

11. 1107 27 987 12 1099 28. 982

13. 1097 29. 976

14. 1092 30. 970 15, 1077 31. 957

16. 1072 _

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1 AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-328 UNIT NO. TWO DATE: September 9, 1998

. COMPLETED BY: Tanya J. Hollomon TELEPHONE: (423) 843-7528 MONTH: AUGUST 1998 l

AVERAGE DAILY POWER LEVEL- AVERAGE DAILY POWER LEVEL l DAY (MWe-Net) DAY (MWe-Net)

1. 1116 17. 1116

2. 1116 18. 1119

3. 1118 19. 1116 l l

4. 1116 20. 1117 l 4

5. 1112 21. 1117

-6. 1111 22. 1115 1

7. 1111 .23. 1117'

8. 1111 24. 1117

9. 1111 25. 1114

10. 1111 26. 1116 I

11. 1113 27. 632

'12 1114 28. 0

13. 1114 29. 0 '

14. 1117 30. 0

15. 1115 31. 625

16. 1115 E-3

l OPERATING DATA REPORT Docket No. 50-327 Date: September 9,1998 ,

Completed By: T. J. Hollomon Telephone: (423) 843-7528

1. Unit Name: SQN Unit 1-

2. _ _ Reporting Period: August 1998

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): 1161

7. Maximum Dependable Capacity (Net MWe): 1122

8. If changes Occur in Capacity Rating (Item Numbers 3 & 7) Since Last Report, Give Reasons: N/A

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 744 5,831 150,504

12. Number of Hours Reactor was Critical 744.0 5,799.3 90,655

13. Reactor Reserve Shutdown Hours 0 0 0

14. Hours Generator On-Line - 744.0 5,784.8 88,844.4

~

15. Unit Reserve Shutdown Hours . 0.0 0 0

16. Gross Thermal Energy Generated (MWh) 2,389,855.2 19,537,406.1 290,781,401 17, Gross Electric Energy Generated (MWh) 812,784 6,747,026 99,148,153

18. Net Electrical Energy Generated (MWh) 784,504 6,530,810 95,230,707

19. . Unit Service Factor 100.0 99.2 59.0

20. Unit Availability Factor 100.0 99.2 59.0

21. Unit Capacity Factor (Using MDC Net) 94.0 99.8 56.4

22. Unit Capacity Factor (Using DER Net) 91.9 97.6 55.I

23. Unit Forced Outage Rate 0.0 0.8 28.7

24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each): Unit 1 Cycle 9 refueling outage started September 9.1998 with a duration of 37 days.

25. If Shutdown at End of Report Period, Estimate Date of Startup. N/A J

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, , OPERATING DATA REPORT Docket No. 50 328 Date: September 9,1998 Completed By: T. J. Hollomon Telephone: (423) 843-7528

1. Unit Name: SQN Unit 2

2. Reporting Period: August 1998

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): 1156

7. Maximum Dependable Capacity (Net MWe): 1117

8. If changes Occur in Capacity Rating (Item Numbers 3 & 7) Since Last Report, Give Reasons: N/A

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 744 5.831 142,464

12. Number of Hours Reactor was Critical 676.9 5,763.9 93,419

13. Reactor Reserve Shutdown Hours 0 0 0

14. Hours Generator On-Line 666.9 5,753.9 91,428.4

15. Unit Reserve Shutdown Hours 0.0 0 0

16. Gross Thermal Energy Generated (MWh) 2,228,728.9 19,564,403.2 293,541,740

17. Gross Electric Energy Generated (MWh) 748,445 6,719,272 99,941,636-

18. Net Electrical Energy Generated (MWh) 722,909 6,517,840 95,923,202

19. Unit Service Factor 89.6 98.7 64.2

20. Unit Availability Factor 89.6 98.7 64.2

21. Unit Capacity Factor (Using MDC Net) 87.0 100.1 60.3

22. Unit Capacity Factor (Using DER Net) 84.6 97.4 58.7

23. Unit Forced Outage Rate 10.4 1.3 27.9

24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each): N/A

25. If Shutdown at End of Report Period, Estimate Date of Startup. N/A l

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4 UNIT SHUTDOWNS AND POWER REDUCTIONS '

REPORT MONTH: AUGUST 1998 - -

DOCKET NO: 50-327 UNIT NAME: SQN-1 -

DATE: September 9, 1998 COMPLETED BY: T. J. Hollomon TELEPHONE: (423) 843-7528 Nr.. Date ' Type' . Duration. Reason 2 Method of Licensee - System Component. .Cause and Corrective Action to Prevent '

d~

(Hours) Shutting ' Event RG6rt' Code Code'- ' Recurrence :

Down^ No.-

Reactor' '

There were no outages or power reductions of greater than 20 percent in the average daily power level during August. Unit 1 entered coastdown for the Unit 1 Cycle 9 refueling outage on August 12 at 0021 EDT. Unit 1 was operating at 86 percent power at the end of August.

' F: Force

• Reason: ' Method

• Exhibit G - Instructions for (NUREG S: Scheduled A-Equipment Failure (Explain) 1-Manual Preparation of Data Entry sheets B-Maintenance or Test 2-Manual Scram for Licensee Event Report (LER)

C-Refueling 3-Automatic Scram - File - NUREG - 1922 D-Regulatory Restriction 4-Continuation of Existing E-Operator Training and License Outage 5

Examination 5-Reduction Exhihit I-Same Source F-Administrative 9-Other G-Operational Error (Explain)

H- Other (Explain)

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UNIT SHUTDOWNS AND POWER REDUCTIONS '

REPORT MONTH: AUGUST 1998

Reactor 3L 1 980827 F 77.1 A 3 50-328/1998002 FK RLY Unit 2 experienced an automatic scram on August 27 at 1357 EDT as the result of a failure of a sudden pressure relay located on the 'B' phase main transformer.

Disassembly of the relay determined that one rocker arm pin had worn to the degree that proper operation of the device was prevented. The pin failure mechanism appears to be wear (fretting).

The relay was replaced and the Unit was returned to service.

' F: Force

• Reason: ' Method

• Exhibit G - Instinctions for (N UREG S: Scheduled A-Equipment Failure (Explain) 1-Manual Preparation of Data Entry sheets B-Maintenance or Test 2-Manual Scram for Licensee Event Report (LER)

C-Refueling 3-Automatic Scram File - N UREG - 1922 D-Regulatory Restriction 4-Continuation of Existing E-Operator Training and License Outage 8

Examination 5-Reduction Exhibit I-Same Sourre F-Administrative 9-Other G-Operational Error (Explain)

H- Other (Explain)

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