ML19276H674

Monthly Operating Rept for Nov 1979

ML19276H674
Person / Time
Site:	Prairie Island
Issue date:	12/01/1979
From:	Hunstad A NORTHERN STATES POWER CO.
To:
Shared Package
ML19276H673	List: ML19276H672 ML19276H674 ML19276H675 ML19276H676 ML19276H677
References
NUDOCS 7912180628
Download: ML19276H674 (8)

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The unit tripped at 1347 on November 5th due to undervoltage on Bus 11 i caused by a ground fault in No.11 Feedwater Pump motor. tie unit was

i returned to service at 0631 the following day and power was limited to

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about 65%. At 0942 on November 15th, a ground fault in No. 12 Feedwater Pump motor caused another trip. No.11 Feedwater Pump motor was re-paired and the unit restarted at 1714 on November 25th and limited to about 65% power. On November 30th, No.12 Feedwater Pump was returned to service and the unit was escals. ting to full power.

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4 DAII.Y UNIT POWER OUTPUT DOCKET NO. 50-282 ~

UNIT Prairie Island No. 1 -

DATE 791201 COMPLETED BY A. A. HunsTa~d TELEPHONE 612-388-4767 MONT11 NOVEMBER 1979 DAY AVERACE LOAD MWe-Net DAY AVERACE LOAD MWe-Net t 480 17 -3

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486 18 -3 1 _

483 19 -3

c. 492 20 -7

, 276 21 -9 6 182 22 -7 7 293 23 -8

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g 297  ;;, -8 o 299 2s 2 10 284 26 239

. t1 300 27 275 17 299 28 276 13 296 29 275 14 294 30 269 15 111 31

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16 -8 Average loads above 503 MWc-Net are due to cooler condenser circulating water,

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OffRAMNG,,DAT". PEP,0RT .

DOCKET NO 50-282 DATE 791201 CO iPLETED BY A. A. Hunstad OPERATING STATUS 7/1EPHONE-612-388-4767

1. Unit Name: Prairie Island No. 1

2. Reporting Period: November 1979 es

3. Licensed Thermal Power (MWt): 1650 1

4 Nameplate Rating (Gross MWe): M3 _,

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5. Design Electrical Rating (Ncc MWe): 510 I

6. Maximum Dependable Capacity (Cross MWe): 534

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C 7. Maximum Dependable Capacity (Net MWe': 503 g 8. If Changes Occter in Capacity Rar inne (Irems Numbe'- 3 Through 7) Sfoce Lart 3epart -

o z Cive Reason: _ . _ _ . - . . _ _ . . . _.

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, 9. Power Level To Which Restricted. ff Anv O'e t tr,c) : , , _ _ , , , , , , _ _ , , , , , _ , , , , . , , _,

O Reasons for Restrictions, i f An _, ,

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This Minch Yr-ro-D:.? c Co .ilative lls Hours In Reporting Period 720 8016 52224

12. Number Of Hours Reactor Was Crirical 467.3 5775.3 40464.4

13. Reactor Reserve Shutdown Hours 252.7 1076.8 5531.9

14. Hours Generator on Line 456.1 5672.2 39389.4

15. Unit Reserve Shutdown Hourr, 0.0 0.0 0.0

16. Gross Thermal Energy Generated (M'.'ll) 533052 8627295 60907877

17. Gross Electrical Ener;;y Generatc] (Wl:' 162740 2753720 19784610

18. Net Electrical Energy Generat.m U S'U) 147998 2564831 18493253

19. Unit Service Factor 63.3 70.8 75.4

20. Unit Availability Factor 63.3 70.8 75.4

21. Unit Capacity Factor (lising MDC t:ct.) 40.9 63.6 70.4

22. Unit Capacity Factor (Using DER Net) 38.8 60.4 66.8

23. Unit Forced Outage Rate 36.7 21.1 13.9

'4. Shutdowns Scheduled Over Next 12 Months (Type, Date and Duration of Ec.:h):

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Refueling, Summer 1980, 5 Weeks

25. If Shut Down at End Of Report Pccied, Estimated Date of Startup -

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caused by ground fault on No. 12

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S: Schedul*d A-E<1uipman t Failure (r cc pl.ain) 1 *f an.nl structions for B ' taint 2r.ance <:r Tect 2 .M.cnual Trip Preparat ion of C-R2f a211n ; 3 -A'2 tona:Le Trip Data Eatry Cheeta b, 3

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The unit tripped at 2333 on November 1st on high steam generator level i when a feedwater regula*.ing valve alfunctioned. The unit was returned

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to service at 0122 on November 3rd. Another trip occurred at 1044 on

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November 14th when a pressurizer level transmitter was valved out with another in trip. The unit was restarted at 1320 the same day but flux distribution problems caused power to be limited to 50% for a day. The unit is base loaded at 100%.

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DAILY UNIT POWER OUTPUT DOCKET NO. 50-306 UNIT Prairie Island No. 2 DATE 791201 ,

COMPLETED BY A. A. Hunstad TI LEPHONE 612-388-4767 510NTil NOVEMBER 1979

!).\Y AVERAGE LOAD MWe-Net DAY AVERACE LOAD MWe-N.'t

t. 495 17 523

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-21 18 522 3 401 19 528

c. 517 20 522

', 521 21 514 6 524 22 520 -

7 523 23 519 9 523 24 521 9

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525 25 518 to 525 2 t> 518

1 527 27 520 t, 524 28 518

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13 526 29 520 14 315 30 519 15 223 31 -

16 477 Average loads above 500 MNc-Net are due to cooler condenser circulating teater

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OJf p?TNG DAT3 PT-PORT pg 80 >

DOCKET NO 50-306 DATE 791201 COMPLETED BY A. A. Hunstad OPERATING STATUS TELEPHONE 612-388-4767

1. Unit Name: Prairie Island No. 2

2. Reporting Period: November 1979 Notes

3. Licensed Thermal Power (MWt): 1650 4 Nameplate Rating (Gross MWe): 593 _,,

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5. Design Electrical Rating (Net MWe): MO l

6. Maximum Dependable Capacity (Cross MWo): 531 [

C 7. Maximum Dependable Capacity (Ne* We': 500 g 8. If Changes Occur in Capacity Rar im.r (f rems Numbe- 3 Through 7) Since- I.a n t h po r t -

v a: Cive Reason: . _ _ _ _ . _ _ . _ . .. _ _.._.. .

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Th in ." nth Yr-To-Date ai olative

11. Ho'ars In Reporting Period 720 8016 43342

12. Number Of Hours Reactor Was Criric;>l 699.2 7941.4 38385.0

13. Reactor Reserve Shutdown Hours 20.8 27.3 1406.0

14. Hours Cencrator On Line 691.6 7921.4 37657.0

15. Unit Rcserve Shutdown liours 0.0 0.0 0.0

16. Gross Thermal Energy Generated Of'..'!!) 1096602 12423406 58442691

17. Gross Electrical Energy Generate 3 ON!:' 367390 4085210 18672950

18. Net Electrical Energy Generat~ i!M:) 345703 3835162 17430750

19. Unit Service Factor 96.1 98.8 86.9

20. Unit Availability F.etor 96.1 98.8 86.9

21. Unit Capacity Facto - (Itsing EC Ne t.) 96.0 95.7 80.7

22. Unit Capacity Factor (Using DF.R Net) 90.6 90.3 76.1

23. Unit Forced Outage Rate 3.9 0.6 5.0

%. Shutdowns Scheduled Over Next 12 Months (Ty,c, Date and Duration of E ;h):

Refueling, January 1980, 5 Weeks

25. If Shut Down at End Of Report Pcciod. Estimated Date of Starrup:

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