ML20059G259

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Monthly Operating Repts for Dec 1993 for Sequoyah Nuclear Plant
ML20059G259
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 12/31/1993
From: Hollomon T
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20059G256 List:
References
NUDOCS 9401240075
Download: ML20059G259 (9)
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Text

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i ENCLOSURE 1 l TENNESSEE VALLEY AUTHORITY NoCLEAR PwER GR0vP SEQUOYAH NUCLEAR FIANT MmfTRLY OPERATING REPORT TO THE NUCIEAR REGUIATORY CGWIISSIGE ,

DECEMBER 1993 >

UNIT 1

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DOCKET AtMBER 50-327  ;

LICENSE NIMBER DPR-77 ,

l UNIT 2 l l

DOCKET NUMBER 50-328 l LICENSE NIMBER DPR-79 i

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Fr 9401240075 940118 y PDR ADOCK 05000327 ..

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l i OPERATIONAL

SUMMARY

! DECEMBER 1993 l

UNIT 1 The Unit 1 Cycle 6 refueling outage continued. Unit i remained in Mode 5 at the end of December.

IINIT 2 i

Unit 2 generated 419,362 megawatthours (MWh) (gross) electrical power  ;

during December with a capacity factor of 50.13 percent. Unit 2 was operating at approximately 100 percent reactor power at the beginning of ,

December.

On December 3 at 1056 EST, Unit 2 experienced a turbine trip and a subsequent-reactor trip. Operations personnel observed erratic indications associated with the generator excitation system. Subsequently, a generator stator,  ;

cooling failure alarm actuated, resulting in a turbine / generator trip and a  !

cubsequent reactor trip. The cause of the event was the overexcitation of the I generator. The overexcitation was determined to have been caused by multiple grounds in the generator exciter. The Unit 2 exciter was replaced, and the-

~

unit was taken critical on December 14 at 1319 EST and tied to the grid at 0617 EST on December 15.  ;

On December 16 at 0241 EST, the Unit 2 turbine was manually tripped because of ,

turbine vibrations; reactor power was maintained at approximately 20 percent. '

(

Turbine balance adjustments were made, and the generator wasstied to the grid -

! at 0221 EST on December 17. Reactor power was increased.to approximately ,

30 percent while additional vibration _ data was taken. The Unit 2 generator  !

i was taken offline at 2139 EST on December 17 for additional balancing; reactor power was maintained at approximately 20 percent. Unit 2 was returned to '

service on December 18 at 1234 EST.

At 1503 EST on December 18, with rea,ctor power at'approximately 24 percent, a load decrease was initiated, resulting in the isolation of two heater  !

strings. Unit 2 was manually removed from the grid at 1525 'EST to aid in stabilizing the plant. Unit 2 was returned to service at 2241 EST that day.

Unit 2 reached 100 percent reactor power level on December 21-at 0305 EST and remained at approximately '.00 percent through the end of December.

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AVERAGE MILY WIT F0WEP. IJCVEL l DOCKET NO. 50-327 UNIT No. 'One DATE: '01-05-94 COMPLETED BY: T. J. Hollomon TELEPHONE: -(615) 843-7528' f MONTH: DECEMBER 199 L f

AVERAGE DAILY POWER LEVEL AVERACE DAILY POWER LEVEL DAY (MWe-Nel) DM (MWe-Net) ..

1 -2 17  :

2 2 18 -16 j 3 -18 19- -1 3

4 -15 20 -1. ,

5 21 -1" ,

6 -11 22 j i

7 -12 '23 -1' l t

l 8 -13 24 -1 9 -12 25 -1 10 -12 26 -1

}

11 -12 27 ' -1 i

12 -19 28 -1: i I

13 -19 29 -1 .:

~l 14 -16 30 -1 1

15 -16 31 -I .;

16 -16 i

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. t AVERAGE DAILY IBilT POWER LEVEL 4

DOCKET NO. 50-328 UNIT No.-' Two DATE: 01'-05 ,

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COMPLETED BY: L J. Ho11omon TELEPHONE: (615) 843-7528- l MONTH: _DECEtiBER 1993 l I

i AVERAGE DAILY POWER LEVEL AVERAGE DAILY POWER LEVEL #

DAX (MWe-Net) DAY (MWe-Net) .

P

.i 1 1140 17 ~200-  ;

l 2 1135 18 11-3 514 19 356 4 -2 20 920 5 -5 :21 1130-6 -2 22 -1134 7 -5 23 1135 8 -2 24 1135-l 9 -2 25 1137 10 -5 26 4 1136 3

11 -2 27 -1135 12 -2 28 1137 13 -5 29 1134 .

14 -5 30 1133 15 135 31 1137 L i

16 10  ;

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OPERATING DATA REPORT 5 i

DOCKET NO.-. 50-327  !

.DATE 01/04/94

-COMPLETED BY L. A _tiollomon.__ .

TELEPHONE 6.11)_B43-7528 ,

t OPERATING STATUS .

l Notes. lj M

1. Unit Name: Seouovah Unit one l'  !
2. Reporting Period: December 1993 ll - l I!
3. Licensed Tharmal Power (MWt): 3411.0 _. l .l'  !
4. Nameplate Rating (Gross MWe): 1220.6 l l. l
5. Design Electrical Rating (Net MWe): _1148.0 l- 'l. -l
6. Maximum Dependable Capacity (Gross MWe): 1162.0 l- -l. l
7. Maximum Oependable Capacity (Net MWe): 1122.0 .J [' .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 l
10. Reasons for Restrictions, If Any: N/A :I t

This Month .Yr-to-Date Cumulative  :

11. Hours in Reporting Period 744 _

8.760 101609..___ l

12. Number of Hours Reactor Was Critical - 0 1.281.3' 56.029  :)
13. Reactor Reserve Shutdown Hours 0 0- 0-
14. Hours Generator On-Line 0 1.220.6' 54.878.5 . -!
15. Unit Reserve Shutdown Hours- 0 0 0  ;
16. Gross Thermal Energy Generated (MLH) 0 3.915.909.5- 178.893.754 l
17. Gross Electrical Energy Generated (MWH) 0 1.358.540 60.702.654 >

-6.972 1.241.815 58.164.037

18. Het Electrical Energy Generated (MWM)
19. Unit Service Factor 0 13.9 50.0
20. Unit Availability Factor 0 13 JL, 50.0
21. Unit Capacity Factor (Using MDC Net) -0.8 12.6 47.3 --l
22. Unit Capacity Factor (Using DER Net) -0.8 - 12.3, 46.2
23. Unit Forced Outage Rate 0 47 1 : ~38.7 -
24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each): '

i

)

25. If Shut Down At End Of Report Period, Estimated Date of Startup: Februar.y 17. 1994 I l

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-. . ~ . . ~ . . . - . . . . . ,

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ib OPERATING DATA REPORT l

' DOCKET [NO. 50-328  :

DATE- 01/04/94 '

COMPLETED BY T. 1. Hollomon _

TELCPHONE (615) B43-7528 OPERATING SIAlVi l Notes' l

1. Unit Name: Seouovah Unit Two l 'l ,
2. Reporting Period: December 1993 .'l l ,
3. Licensed Thermal Power (MWt): 3411.0 l: l: ,
4. Nameplate Rating (Gross HWe): _1220.6 l ')' ,
5. Design Elect-ical Rating (Net HWe): 1148.0 .l~ .l .

l 6. Maxinran Depen. .'le Capacity (Gross HWe): 1162.0 l. ^ lL I

7. Maximum Depend 'e Capacity (Net HWe): 1122.0 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 r l
10. Reasons For Restrictions, If Any: N/A  :

t l 5 This Month' Yr-t'o-Date' Cumulative t

11. Hours in Reporting Period 744 8.760 101.569 . l
12. Number of Hours Reactor Was Critical 477.6 2.545.9 58.759
13. Reactor Reserve Shutdown Hours 0 0 0
14. Hours Generator On-Line 414.8 2.216.1- 57.293.5 _ -
15. Unit Reserve Shutdown Hours 0 0 0 ,
16. Gross Thermal Energy Generated (HWH) .1.268.193.4 -6.581.173.4. 179.762.952 [
17. Gross Electrical Energy Generated (HWH) 419.362 -2.204.825 60.927.944 ,
18. Net Electrical Energy Generated (HWH) 401.384 2.063.011 58.278.286 j j 19. Unit Service Factor 55.8 25.3~ 56.4'
20. Unit Availability Factor , _ _

55.8 25.3. 56.4:

l 21. Unit Capacity Factor (Using HDC Net). ,__

48.1 21.0 51.1

! 22. Unit Capacity Factor (Using DER Net) 47.0 20 5.__ 50.0  ;

23. Unit Forced Outage Rate 44.2' 74.7' 37.1 ,
24. Shutdowns Scheduled Over Next 6 Honths (Type, Date,-and Duration of Each): j Unit 2 Cvele 6 ri fuelina outage. April 1.'1994. 65 days
l. .

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

DOCKET NO: 50-327 UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT NAME:_ One DATE: 01/08/94

! REPORT HONTH: Dere:nber 1993 COMPLETED BY:T. J. Hollomon '

TELEPHONE:f615) 843-7528 l

Method of Licensee Cause and Corrective Duration Shutting Down Event System Compgnent Action to No. Date Type l 2 Reactor 3 Report No. d Prevent Recurrence (Hours) Reason Code Code 4 931201 S 744 C 4 N/A N/A N/A The Unit 1 Cycle 6 refueling outage continued.

2 f.: son: 3 4 I:F Forced Hethod: Exhibit G-Instructions S: Scheduled ' A-iquipment Failure (Explain) 1-Manual for Preparation of Data B-Haintenance 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) = ~ ~ ~

DOCKET NO: 50-328 -

UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT NAHE: Two DATE: D1/08/94 REPORT MONTH: December 1993 CDNPLETED BY:T. J. Holloman TELEPHONE:(615) 843-7528 Method of Licensee Cause and Corrective Duration Shutting Down Event System Component Action to No. Date Type l Reason 2 Reactor 3 Report No. 4 S Prevent Recurrence (Hours) Code Code 8 931203 F 283.35 A 3 328/93006 TL EXC On December 3 at 1056 EST.

dated TJ TS Unit 2 experienced a turbine trip 1/6/94 and a subsequent reactor trip.

Operations personnel observed erratic indications associated with the generator excitation system.

Subsequently, a generator stator cooling failure alarm actuated, causing the turbine / generator trip and subsequent reactor trip. The root cause of the event was the overexcitation of the generator.

The overexcitation was determined to have been caused by multiple grounds in the generator exciter.

The Unit 2 exciter was replaced, and the unit was taken critical on December 14 at 1319 EST and returned to service at 0617 EST on December 15.

2 3 Method: #

I:F Forced Reason: 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-Admini strative 9-Other S-Operational Error (Explain) 5 Exhibit I-Same Source H-Other (Explain)

DOCKET NO: 50-328 UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT NAME: Two

  • DATE: 01/08/94 REPORT MONTH: December 1993 CDNPLETED BY:T. J. Hollomga , ,

TELEPHONE:f6151 843-7528 Method of Licensee Cause and Corrective ,

Duration Shutting Down Event System Compgnent Action to No. Date Type l (Hours) Reason 2

Reactor 3 Report No. Code 4

l Code Prevent Recurrence 9 931216 F 38.59 A 3 N/A N/A N/A On December 16 at 0241 EST, the t Unit 2 turbine was manually tripped as a result of turbine vibration.

Balancing of the turbine was per-formed. The generator was tied to the grid at 0221 EST on December 17 and reactor power was increased to approximately 30 percent while additional vibration data was taken. The Unit 2 generator was taken offline at 2139 EST on December 17 for balancing. Unit 2 was returned to service on December 18 at 1234 EST.

10 931218 F 7.3 H 5 N/A N/A N/A At 1503 EST on December 18, with reactor power at approximately 24 percent, a-load decrease was initiated, causing an isolation of two heater strings. The Unit 2 turbine was manually removed from the grid at 1525 EST to help sta-bilize the plant. The cause of the heater string isolation is design related in that reductions in power can cause heater level, perturba-

  • tions. A design change currently .

scheduled for the Cycle 7 outage will provide a bypass to 'the con-densate and provide better heater ,

level control. Unit 2 was returned to service at 2241 EST that day.

2 3 #

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