ML20204B431

Monthly Operating Rept for Sept 1978

ML20204B431
Person / Time
Site:	Maine Yankee
Issue date:	10/10/1978
From:	Sjogren R Maine Yankee
To:
Shared Package
ML20204B428	List: ML20204B425 ML20204B431
References
NUDOCS 7810170151
Download: ML20204B431 (4)

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l MAINE YANKEE NUCLEAR POWER STATION MONTHLY STATISTICAL REPORT 78-9 FOR Tile MONTil 0F SEPTEMBER,1978 l w, 9 a) 7 Tri o r 7 o f 5/ -

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OPERATING DATA REPORT DOCKET NO. 50-309 DATE 781010 COMPLETED BY R M. Sjocren i TELEPHONE (6171366-9011X2281 OPERATING STATUS MAINE YANKEE Notes

1. Unit Name:

2. Reporting Period:

September, 1978 2630 l

3. Licensed Thermal Power (MWt):

830

4. Nameplate Rating (Gross MWe):

790

5. Design Electrical Rating (Net MWe):

6. Maximum Dependable Capacity (Gross MWe): 800

7. Maximum Dependable Capacity (Net MWe): 760

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

-\.

9. Power Level To Which Restricted. lf Any (Net MWe): Approximate 1s 70's

10. Reasons For Restrictions,1f Any: Failure of one main transformer.

(See summary of operating experience.)

m i This Month Yr. to Date Cumulative e i .

11. Ilours in Reporting Period 720 6.551 _

12. Number OfIlours Reactor Was Critical 488 5.320 42.849 -

0 0 0

13. Reactor Reserve Shutdown Hours 453.57 5,216.87 41,374.87

14. Hours Generator On-Line ,

0 0 0 .

15. Unit Reserve Shutdown Hours 750,234 11,664,382 86,106,188 ,

16. Gross Thermal Energy Generated (MWH)

17. Gross Electrical Energy Generated ($WH) 257,690 _~~ _, 3,856,150 28,094,320

18. Net Electrical Energy Generated (MWH) 242,263 3,662,189 26,595,460 i

19. Unit Service Factor

'63 -

79.6 80.1 l 79.6 80.1

20. Unit Availability Factor 63

21. Unit Capacity Factor (Using MDC Net) 44.3 73.6 67.8 42.6 70.8 65.2

22. Unit Capacity Factor (Using DER Net) 37 5.2 3.7

23. Unit Forced Outage Rate

24. Shutdowns Scheduled Over Next 6 Months (Type.Date.and Duration of Eacht:

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

26. Units in Test Status (Prior to Commercial Operation): Forecast Achieved

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INITIAL CRITICALITY g-j_

INITIAL ELECTRICITY COMMERCI AL OPER ATION l.

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(9/77)

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' AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-309 l- WIT Maine Yankee w

DATE 781010 v

COMPLETED BY R.M. Siocren i TELEPHONE (617)366-9011X2281 MONTH September, 1978 l DAY AVERAGE DAILY POWER LEVEL  !

DAY AVER AGE DAILY POWER LEVEL (MWe Net) (MFc-Net) 0 37 591 3

2 0 gg 585 1 1

591 I 3 n 39 4 0 _ 20 588 0 23 586 1 5 1 0 592 i

. 6 22 l 7 _

0 23 591 0 592 8 24 0 593 j 9 25. _

0 26 592 10 11 11 27 592 12 118 28 593 l 13 365 2i ,

593 386 593 14 30 15 387 3, 16 556

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INSTRUCTIONS dn this format list the average daily uliit power levelin MWe Net for each day in the reporting month. Compute to the nearest whole megawatt.

(9/77)

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DOCKET NO. 50 .09 ,

UNIT SHUTDOWNS AND POWER REDUCT'ONS UNITNAME I.f.ine Yankee DATE 731010 COMPLETED 8Y D M yinoynn REPORT MON 111 September, 1978 f6171366-9011X2281' TELEPHONE

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, .5 ? 3 $YE Licensee P, h Cause & Corrective '

No. Date Q 5g N 355 Event gy 9-3 -

Action to F

$= 5 5 e ;y3 g Report a tn U EO O

Prevent Recurrence 7

O 1-78-4 8-31-78 F 260.4 A '3' NA EB TRANSF Winding failure of Main Transformer I B.

thru.

9-10 ..

2-78-4 9-11 F 27.1 A 1 NA CH VALVEX Stem / disc separation of #2 f eed Reg.

th r" . Valve inlet isolation valve.

9-12-78 a

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t i 2 3 4 F: Foiced Reason: Method: Exhibit G -Instructioris S: Scheduled A-Equipment Failure (Explain) l-Manual for Preparation of Data B-Maintenance of Test 2-Manual Scram. Entry Sheets for Licensee C-Refueling 3-Automatic Scram. Event Report (LER) File (NUREG-D-Regulatory Restriction 4-Other (Explain) 0161)

E-Operator Training & License Examination F-Administrative 5 G-Operational Error (Explain) Exhibit I - Same Source (9/77) Il-Ot her (Explain)

DOCKET NO. 50-309 i l

UNIT Maine Yankee DATE 781010 COMPLETED BY R. M. Sjogren l

TELEPHONE (617)366-9011X2281 I l

REPORT MONTH September, 1978 l

SUte!ARY OF OPERATING EXPERIENCES At the beginning of this month the plant was shutdown due to a failure i of one of the plant's two half-capacity main transformers. While the remaining transformer was being uprated to permit s70% operation the primary plant was cooled down to replace the seal cartridge in #2 RCP.

One of the four seals in this cartridge had failed shortly after startup following the refueling outage last month. Leakage problems on the CEDM vents caused a delay of 3-4 days for plant startup.

The plant was placed on-line at 2320 on 9-10-78 but had to be taken  !

off-line at 0456 on 9-11-78 when the inlet isolation valve to #2 feedwater regulating valve would not open and the valve stem became separated from the valve's gates. Repairs were completed and the plant phased back on-line at 0802 on 9-12-78.

Plant load was stabilized at 48% by 0300 on 9-13-78 and physics testing was performedt Following the testing, load was increased to N69% (630 MWe) and maintained there for the rest of the month.

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