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Monthly Operating Rept for Dec 1978
	ML20083K242
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	01/12/1979
From:	Sjogren R; VERMONT YANKEE NUCLEAR POWER CORP.
To:	;
Shared Package
ML20083K241	List: ML20083K239; ML20083K242;
References
	NUDOCS 7901170243
	Download: ML20083K242 (6)
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I ll VERMONT YANKEE NUCLEAR POWER STATION

' MONTHLY STATISTICAL REPORT 78-12 FOR THE MONTH OF DECEMBER, 1978 e

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OPERATING DATA REPORT i

50-271 DOCKET NO.

i DATE 790112 i

COMPLETED BY R. M. Siogren TELEPHONE (M 7T 166-9011 4

X2281 OPERATING STATUS Notes

1. Unit Name:

yERMONT YANKEE

2. Reporting Period:

December. 1978

3. Licensed Thermal Power (MWt):

1,593 540

4. Na:neplate Rating (Gross MWe):

5. Design Electrical Rating (Net MWe): 514 (ooen evele) 540 tclosed cycle) 535

6. Maximum Dependable Capauty (Gross MWe):

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7. Maximum Dependable Capacity (Net MWe):

504

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

9. Power Level,To Which Restricted.If Any (Net MWe):

None

10. Reasons For Restrictions,if Any:

N/A This Month Yr to.Date Cumulative

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11. Hours In Reporting Period 744 8,760 55,034.75

12. Number Of Hours Reactor Was Critical 732 6,853.97 43,889.83 0

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13. Reactor Reserve Shutdown Hours

14. Hours Generator On.Line 725 6,649 42;097 0

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15. Unit Reserve Shutdown Hours

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16. Gross Thermal Energy Generated (MWH) 1,112,565.5-10.045.660.0 58,386.803.0

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17. Gross Electrical Energy Generated (MWH) 379,252 3.394,758 19.339.468

18. Net Electrical Energy Generated (MWH) 364.182 3.240.697

-18,319.530

19. Unit Service Factor 97.4 75.9 76.5 l

20. Unit Availability Factor 97.4*

75.9 76.5

21. Unit Capacity Factor (Using MDC Net) -

97*1~

73.'4 66.0

22. Unit Capacity Factor (Using DER Net) 95.2 71.9 64.7 2.6' 17.6 7.3

23. Unic Forced Outage Rate

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

NONE c

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

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

Forecast Achieved

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,.2 INITIAL CRITICALITY INITIAL ELECTRICITY COMMERCIAL OPERATION (9/77) i e

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AVERAGE DAILY UNIT POWER LEVEL DOCKET NO.

50-271 UNIT -Vermont Yankee DATE 790112 COMPLETED BY R. M. Sioeren TELEPHONE (617) 366-9011 X-2281 MONT1!

Dacamher-1978

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DAY AVERAGE DAILY POWER LEVEL D'AY AVERAGE DAILY POWER LEVEL (MWe-Net)

(MWe-Net) 1.

571 37 469 2

524 33 523 3

509 39 q99 4

523.

20 523 5

524 21 521 6

523 22 522 i'.

7 523-23 521 8

523 24 507 9

01 25 369 10 513-26 122 11.

522 27 355 12 523 459 28 29 467 13 974 14

'523 30 413 15 523 33 508 16-523 INSTRUCTIONS On this format.!ist the avenge daily unit power lesel in MWe. Net for each day in the reporting month. Compute to the nearest whole megawatt.

(4177)

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DOCKET NO.

50-271 UNITSilulDOWNS AND POWER REDUCTIONS UNIT NAM E Vermont Yankee DATE 790112 COMPLE1 ED ilY R. II. Sjoeran REPORT MONTil December.1978 TELLPilONE (6In 166-0011

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.h liccusee Eg, a'1, Cause & Correceive N. i.

Date g

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,3 g oc Event gi n.3 Auinn o -

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78-20 781203 S

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None N/A N/A II - Turbine Surveillance (Power

!teductii >n) 78-21 7?ll217 S

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None N/A N/A 11 - Turbine Surveillance (Power teductli 'n) 78-22 781224

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None N/A N/A H - Turbine Surveillance (Power teduction) 78-23 781225 F

19 B

3 None CBA Valve X B - See Operations Summary 78-24 781229 S

0 11 4

'None RAA Conrod H - Control Rod Pattern Adjustment h

(Power teductii.n)

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I:: Fost ed Heason:

Method:

Exhibit G. Inst ructions S: Stlieduled A-lignipniens Failure (Explain)

1. Manual for Picparation of Data ll Mainicnance or Test 7 Manual Scrain.

Enity Shecis for 1.iecusee C Relucling 3.Auturnatic Scrain.

Eveni Hepine (l.liR)1 ile INtillEG.

D Hegulatiny Hestriction 4 Other (limplain) 016l1 li Opciaior leaining & license Exanileiation 1 Adeninisti.iiive' 5

G Opceational I.s sus (limpi.iin)

Eminliii I. Same Souece

(*8/77) 11 Hil cs (limplein),

10CkliT NO.

50-271 9

UNIT Vermont Yankee DATE 790112 COMPLETED liY R. H. Singren TELEPil0NE (617) 366-9011 X2281 SAFETY I! ELATED MAINTENANCE NATUllE OF LER OR OLITAGE HALFUNCTION EQtill'!!ENT MAINTENANCE NUM11ER CAUSE RESULT CollRECTIVE ACTION

. RWCU Regen. Heat Corrective NA Failed gasket Flange leakage Replaced gasket Exchanger Relief Valve HR 78-1194 RWCU Regen. Heat Corrective NA Failed gasket Flange leakage' Repaired Exchanger HR 78-1206 "A" Air Ejector Off Cas Corrective LER 78-34 Failed components Erratic Indicatior Replaced with spare unit Monitor HR 78-1236 Torus water level in-Corrective LER 78-35 Loss of Reference Incorrect Icvel Established reference leg struments HR 78-1249 Leg Water Level indication water level i

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DOCKET NO.

50-271 UNIT Vermont Yankee DATE 790112 COMPLETED BY R. M. Sjogren TELEPHONE (617) 366-9011 X2281 REPORT NONTH December, 1978 1

SU:4!ARY OF OPERATING EXPERIENCES Highlights Vermont Yankee operated at 93.9% of rated thermal power for the month of December, 1978. Gross electrical generation for the month was 379,252 MWHe, or 94.4% of design electrical capacity.

Operations' Summary The following is a chronological description of plant operations including other pertinent items of interest for the month:.

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12-1 At the beginning of this report period, the plant was operating at 99% of rated thermal power..

12-3 At 0500 hours0.00579 days 0.139 hours 8.267196e-4 weeks 1.9025e-4 months power was re.duced to 75% for. turbine surveillance.-

A return to full power'was initiated at 0600 hours0.00694 days 0.167 hours 9.920635e-4 weeks 2.283e-4 months .

12-17 At 0500 hours0.00579 days 0.139 hours 8.267196e-4 weeks 1.9025e-4 months power was reduced to 77% for turbine' surveillance.

l A return to full power was initiated at 0600 hours0.00694 days 0.167 hours 9.920635e-4 weeks 2.283e-4 months .

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12-24 At 05d0 h'ours power was reduced to.78% for turbine surveillance.

A return to full power was initiated at 0600 hours0.00694 days 0.167 hours 9.920635e-4 weeks 2.283e-4 months .'

12-25 At 1700 hours0.0197 days 0.472 hours 0.00281 weeks 6.4685e-4 months a reactor scram occurred.. A control room' operator was in the process of performing a routine MSIV ' exercise.

The valve test pushbutton was depressed for a marginally.long

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period of time, and as a result, MSIV 80A began to restrict

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steam flow in the "A" steam line.. The-reactor simultaneously.

isolatti due to high steam flow in the other lines and a full reactor scram occurred. A return to full power was initiated at 0512 on 12-26.

Phased ~to grid at'12:32 on 12-26.

i 12-29 At 1900 hours0.022 days 0.528 hours 0.00314 weeks 7.2295e-4 months power was reduced to 65% to effect a Rod Pattern Adj ustment. A ' return-to full power was initiated at 2330 hours0.027 days 0.647 hours 0.00385 weeks 8.86565e-4 months .

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12-31 At the conclusion of this report period, the plant was operating at 99% of rated thermal power.

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ML20083K242

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