ML20217A507

Monthly Operating Repts for Oct 1990 for Sequoyah Nuclear Plant Units 1 & 2

ML20217A507
Person / Time
Site:	Sequoyah
Issue date:	10/31/1990
From:	Hollomon T, Wallace E TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9011210143
Download: ML20217A507 (12)

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. TENNESSEE VALLEY AUTHORITY SN 157B Lookout Place Chattanooga, Tennessee 37402-2801 November 15, 1990 U.S. Nuclear Regulatory Comission i

-ATTN Document Cont rol Desk Washington, D.C. 20555 Gentlement l

In the-Matter of' ) Docket Nos. 50-327 Tennessee' Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SQN) . OCTOBER 1990 MONTHLY OPERATING REPORT  :{

' I l Enclosed is the October 1990 Monthly-Operating Report as required by SQN j Technical Specification 6.9.1.10. j ,

If you have any. questions concerning this matter, phase call M. A. Cooper at (615) 843-6422. i Voty.truly yours, r

TENNESSEE VALLEY AUTHORITY.

..w A p -!

. E. G. Wallace, Manager Nuclear Licensing tnd e Regulatory Affairs- l

. Enclosure cc (Enclosure)t-Mr.:J. N. Donohew, Project; Manager

-NRC Resident Inspector ,

i U.S. Nuclear Regulatory Comission .Sequoyah Nuclear Plant

-One White Flint,-North 2600.Igou Ferry Road 11555 Rockville Pike .

Soddy "a"y, Tennessee 37379 '

Rockville. Maryland 20852' Regional Administration.

-INPO Recorde-Center U.S.: Nuclear Regulatory Comission Institute of ' Nuclear Power Operations .0ffice of' Inspection and Enforcement, 1100' Circle 75 Parkway, Suite 1500- Region II Atlanta, Georgia 30389 101 Marietta Street,-NW, Suite 2900 ,

Atlanta,' Georgia 30323 i Mr; Ted Marston.1 Director Electric Fower Research Institute Mr. B. A. Wilson..' Project. Chief P.O. Box 10412 U.S. Nuclear Regulatory Comission Palo-Alto, California 94304 Region II _ _

j 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 ,

9011210143 901031 PDR ADOCK 05000327  !

li ..

5 An Equal Opportunity Employer

L. '

U.S. Nuclear Regulatory Commission November- 15, 1990

' MAC JWP JSS GC cc: RIMS, MR 2N 58F-C (Joelosure)

C. L. Breeding, LP 2h 144C-0 (Enclosure)

J. R. Bynum, LP 6N 38A-C W. R. Cobean, Jr., LP 6N 38A-C (Enclosure)

D. L. Conner, MBC 01-STC (Enclosure - 2) p M. A. Cooper, OPS AC-SQN (Enclosure) d C. L. Dumsday, Westinghouse, DSJ 1C-SQN (Enclosure)

N. C. Kazanas, BR SS 108A-C (2)

T. J. McGrath, LP 6N 23F-C (Enclosure)

M. O. Medford, LP 6N 38A-C G. R. Mullee, BR SS 168A-C (Enclosure)

D..E. Nunn. Jr., LP 6N 20E-C C. A. Vondra, POB 2B-SQN K. W. Whittenburg, MR 2S.710-0 l

~J. L. Wilson,-OPS 4A-SQN (Enclosure) j JV 0. J. Zeringue, PAB E-BFN l y

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f ,.7 TENNESSEE VALLEY AUTHORITY NUCLEAR POWER GROUP SEQUOYAH NUCLEAR PLANT e

l MONTHLY OPERATING REPORT r[

TO THE t

NUCLtJ3 REGULATORY COMMISSION

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OCTOBER 1990 UNIT 1

. DOCKET NUMBER 50-327 LICENSE NUMBER DPR-77 UNIT 2 DOCKET NUMBER 50-328 LICENSE NUMBER DPR-79

01)ERATIONAL SHARY 00I0BER1990 UNIT 1 Unit _1 generated 461,390 MWh (gross) electrical power during October, with a capacity factor of 52.35 percent. Unit 1 was operating at 100 percent reactor power level at the beginning of October, but was forced to shutdown on October 8, 1990. At 0710 (EDT) that day, the unit entered Limiting Condition for Operation (LCO) 3.7.1.5 and a notice of unusual event (NOUE) was declared as a result of identifying a disc failure by radiograph on Main Steam Check Valve (MSCV) 1-VLV-1-624. Following shutdown of the unit, it was found that three MSCV disc post failures had occurred, 1-VLV-1-623, 1-VLV-1-624, and 1-VLV-1-625. The turbine was manually tripped at 1052 (EDT); and at 1102 (EDT), the unit entered Mode 3. Unit 1 entered Mode 4 on October 8, 1990, at 1535 (EDT), and remained in Mode 4 throughout the process of repair / replacement on the check valves. Full details of the forced Unit 1 shutdown are documented in Incident Investigation Report II-90-117 and LER 50-327/90024.

On October 21, 1990, at 0800 (EDT), Unit 1 was again critical, and power level increase began. The unit was online again at 2254 (EDT). Unit i reached 99 percent power using delta T indicators on October 23, 1990, at 1130 (EDT),

and was at 100 percent on October 24,1990, at 1605 -(EDT).

Unit 1 was operating at 100 percent reactor power level at the end of October.

UNIT 2

-Unit 2 Cycle 4 refueling outage continued throughout the month of October.

Unit 2 began the month in "no mode," i.e. , fuel of floaded f rom the reactor vessel. On October 8, 1990, the unit entered Mode 6 when the first fuel assembly was reloaded into the reactor vessel. On October 11, 1990, at 0445 (EDT), all fuel was reloaded. On October 15, 1990, at 1025 (EDT), Unit 2 entered Mode 5.and remained in Mode 5 through the end of October.

= POWER-OPERATED RELIEF VALVES (PORVs) AND SAFETY VALVES

SUMMARY

There were no challenges to PORVs or safety valves in October.

OFFSITE DOSE CALCULATION MANUAL (ODCM) CHANGES There were no changes to the ODCM during October.

AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-327 UNIT No. One DATE: 11-07-90 COMPLETED BY: T. J. Ho11omon TELEPHONE: (615) 843-7528 MONTH ~ OCTOBER 1990

, AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL l DAY- (MWe-Net) DAY (MWe-Net) 1-. '1112 17 - 14 2 1112 18 - 19 3 1111 19 - 19 4 '1113 20 - 26 iS . 1112 21 - 36 6 1113 22 274 l

'7 1111 23 984

'8 428 24 1121

.9 - 14 25 1125 ,

in '.'10 - 16 26 1128

-n 11- *

- 16 ,

27 --- 1128-12 '- - 19 .28 1123 I

13 ' 29 =1128 14 ' - 21 30 1126

'15 = 31= 112'6 16 '- 19 1-4 q,

4

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AVERAGE DAILY UNIT POWER LEVEL

- DOCKET NO. 50-328 UNIT No. Two DATE: 11-07-90 COMPLETED BY: T. J. Ho11omon TELEPHONE: (615) 843-7528 MONTH: OCTOBER 1990 AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL DAY (MWe-Net) DAY (MWe-Net) 1 -5 17 -5 2 -5 18 -5 3 -5 19 -5 4 20 -5 J5 5 21 -5 6 -, 22 -

-5 7* -5 23 -5 .

8 -5 24 -5 9 --5 25 -- 7 10 --5 26- -5'

.11- 27 -5 12- -5 28 -5 ,

13 -5 29 -5 14' -5 30 -5 15 -- - 5: 31 16 ' '

.* Unit 2.is of'fline for Cycle 4 refueling outage.

4:

OPERATING DATA REPORT DOCKET NO. 50-327 DATE Nov. 7. 1990 COMPLETED BY T. J. Hollomon TELEPHONE fts151 843-7528 l

OPERATING STATt)$

l Notes l

1. Unit Name: Seouovah tinit one l l

2. Reporting Period: Detober 1990 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 g l

6. Maximum Dependable Capacity (Gross HWe): 1183.0 l l

7. Maximum Dependable Capacity (Net MWe): 1148.0 _ l 1 8.- If Changes Occur in Capacity Ratings (!tems Number 3 Thro gh 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 745 7.296 81.841

12. Number of Hours Reactor Was Critical 436.03 5.112.8 38.608

13. Reactor Reserve Shutdown Hours 0 0 0

.14. Hours' Generator On-Line 421.0 4.942.6 37.632.0

15. Unit Reserve Shutdown Hours 0.3 0 0

15. Gross Thermal: Energy Generated (MWH) 1.381 159.5 16.018.903.2 122.354.823

17. Gross Electrical Energy Generated (MWH) 461.390 5.407.680 41.431.436

- 18. Het Electrical- Energy Generated (MWH) ' 438.581 5.200.789 39.672.818 19.' Unit Service factor. 56 . 5 ___ 67.7 46.0

.20. Unit Availability, Factor- 56.5 67.7 46.0

21. Unit Capacity Factor (Using HDC Net) 51'.3 62.1- 42.2 f22. Unit Capacity Factor (Using DER Net) 51.3 62.1- 42.2 J23.' Unit Forced OutagtR ate. 43.5 9.3 46.2

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

, s (25. If= Shut Down At End Of Report Period, Estimated Date of Startup: N/A r5

L OPERATING DATA REPORT DOCKET NO. 50-328 i DATE Nov. 7. 1990 COMPLETED BY T. J. Hollomon TELEPHONE (615) 843-7528 1

OPERATING STATUS l Notes l

.I. Unit Name: Seouovah Unit Two l l

2. . Reporting _ Period:

October'1990 l l l - l3.=- 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): 1183.0 l l

7. _ Maximum Dependable Capacity (Net MWe): 1148.0 l l

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

N/A t

9. Power Level To Which Restricted..If Any (Net MWe): N/A

10. Reasons For Restrictions,_ If Any: N/A s.-

This Month Yr-to-Date ' Cumulative

11. Hours in Reporting Period 745 7.296 73.801

12. Number of Hours Reactor Was Critical 0.0 5.975.0' 39.505

13. Reactor Reserve Shutdown Hours 0 0 0

14. Hours Generator On-Line- 0.0 5.963.4 38.659.2

15. Unit Reserve Shutdown Hours ' O.0 0 0

.16. Gross Thermal Energy Generated ,(MWH)' O.0 19.268.794.2 119.679.054

17. Gross Electrical Energy Generated (MWH) 0 6.5P8.500 40.609.296

18. Het Electrical Energy Generated (MWH) f3.856) 6.336.962 '38.785.296

19. Unit Service Factor- 0.0 81.7 52.4'

20. Unit Availability Factor ' O.0 81.7 52.4

- 21. Unit Capacity factor (Using'HDC Net) -0.5 75.7- 45.8 i- - 22. Unit Capacity Factor;(Using DER Net) -0.5^ 75.7 45.8

' 23. Unit Forced Outage Rate '0.0 0.6 40.9

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

25. If Shut Down At End Of Reoort Period. Estimated Date of Startup: November 13. 1990 r

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. . . . DOCKET NO: 50-127 UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT NAtC: - Oge '

DATE: 11/07/90 . , ,

REPORT MONTH: October 1990 COMPLETED BY:L '. Hollomon TELEPHONE-IoIS) 843-752B Method of ticensee Lause and Corrective Duration Shutting Down- Event Systga Compgnent Action to No. Date Type l '. ~(Hours) Reason2 Reactor 3 Report No. Code Code ' prevent Recurrence 11 901008 F 324.03 A .I 327/90024 58 V On October 8,1990, with Unit 1 MSCV disc operating at 100 percent power post level, at 0710 EDI, LCO 3.7.1.5 failure was entered and an NOUE was declared as a result of identifying a disc failure on MSCV l-VLV-1-624. Following shutdown of the unit. it was found that three MSCV disc post failures had occurred, 1-VLV-1-623. 1-VLV-1-624, and 1-VLV-1-625. The failure mechanism was the high-cycle, low-stress fatigue of the post Caused by reverse bending. The turbine was manually tripped at 1952 EDI, and at 1102 EDT. Unit 1 entered Mode 3. Unit I entered Mode 4 on October 8, 1990, at 1535 EDT, and remained in Mode 4 throughout the process of repair / replacement on the check valves. To prevent recurrence, modifications were made to

_ improve stress distribution ar.d reduce static tensile residual stresses on the MSCV disc post. On October 21. 1990, at 0600 EDT, Unit I was again critical and was online at 2254 EDT. Unit I was at 100 percent reactor power level on October 24, 1990 at 1605 EDT.

I:F Forced 2 Reason: 3 Method: 4 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 S-Reduction F-Administrative 9-Other G-Operational Error (Explain) 5 Exhibit I-Same Source H-Other (Explain)

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DOCKET NO: 50-328 .

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' UNIT NAME: Twa UNIT SHUTDOWNS AND POWER REDUCTIONS DATE: 11/07/93 COMPLETED BY:T. J. Ho11 omen -*

REPORT MONTH: October 1990 TELEPHONE:(6151 843-1528 Method of Licensee Cause and Corrective Cooppnent Action to Duration Shutting Down- Event Systy Prevent Recurrence Date Type, (Mours) Reason 2 Reactor3 Report No. Code  % e--

No.

PMA N/A N/A ~ Unit 2 Cycle 4 refueling S 900908 -S 1294.02 C 1 outage continued.

l 2 Reason: 3 Hethod: 4 Exhibit G-Instructions I:F Forced .

1-Manual for Preparation of Data 5: Scheduled A-Equipment failure (Explain) Entry sheets for Licensee B-Maintenance or Test 2-Manual Scram 3-Automatic Scram Event Report (LER) File C-Refueling 4-Continuation of Existing Outage (NUREG-1022)

D-Regulatory Restruction E-Operator Training and License Examination S-Reduction F-Administrative- 9-Other 5 Exhibit 1-Same Source G-Operational Error (Explain)

H-Other (Explain) e

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LICENSING TRANSMITTAL TO NRC DATE TRANSMITTED

SUMMARY

AND CONCURRENCE SHEET TO EGW t THE PURPOSE OF THIS CONCURRENCE SHEET IS TO ASSURE THE ACCURACY AND COMPLETENESS OF TVA SUBMITTALS TO THE h30.

DATE DATE DUE NRC 11/15/90 - C ACTION NO.

SUBMITTAL PREPARED BY J. S. Smith FEES REQUIRED YES NO X PROJECT / DOCUMENT.I.D. Sequoyah Nuclear Plant (SON) - October 1990 Monthly Operating Report PURPOSE /

SUMMARY

Transmit to NRC the monthly operating report for October as-required by Technical Specification 6.9.1.10.

RESPONDS TO N/A _ (RIMS NO.) COMPLETE RESPONSE YES X NO PROBLEM OR DEFICIENCY DESCRIPTION N/A CORRECTIVE ACTION / COMMITMENT N/A INDEPENDENT REVIEW DATE A concurrence signature' reflects that the s'ignatory has assured that the submittal is appropriate and consistent with TVA policy, applicable commitments are approved for implementation, and supporting documentation for submittal completeness and accuracy has been prepared. '

CONCURRENCE SIGNATURE OR NAME ORGANIZATION LETTER REFERENCE DATE f . L.' Wilson SQN-Site-Vice President 3b //" l E DO CI C.'A. Vondra CQN Plant Mar - .m,- //-/Y-94 by N M. A.' Cooper SON Site-Lie Mgr i

M. <

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APPROVED _._ ' p' -JL DATE ////f/fd 9~ NLRA MANAGEk ' '

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-- _ y Sequoyah Site Licensing i Concurrence Eheet DUE TO EGW DATE DUE NRC 11/15/90 - C PROJECT / DOCUMENT I.D. Sequoyah Nuclear Plant (SON) - October 1990 Monthly Operating Report CONCURRENCE SIGNATURE OR NAME ORGANIZATION LETTER REFERENCE DATE J. W. Proffitt SON Compliance Lic Mgr  ! pse.//) MM 11//j/90 J. S.-Smith SON Site Licens'ing /

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!![/J/90 J. H. Holland SON Corrective Action Prog o) n\90 T. J. Hollomon SON Corrective Action Prog Affd$701 18[ kB b

NRC response or approval required? .Yes X No

• • • NOTE:. This sheet should be removed by Corporate'L.' censing upon receipt.***

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