ML20077A712

Monthly Operating Rept for Apr 1991 for Vermont Yankee

ML20077A712
Person / Time
Site:	Vermont Yankee
Issue date:	04/30/1991
From:	Murphy W, Wallin G VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
VYV-91-120, NUDOCS 9105100355
Download: ML20077A712 (6)

Text

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i V dthiONT YANKEE NUCLEAR POWER CORPORATION

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\- P.O. Box 157, Governor Hunt Road

( Vernon. Vermont 05354-0157 qn..

., (802) 257 7711

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May 10, 1991 VYV 91-120

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U.S. Nuclear Regulatory Commission ATTN Document control Desk i- Washington, D.C. 20555 D' ear Sir t

l Submitted herewith is the Monthly Statistical Report for the Vermont Yankee Nuclear Power Station for the month of April, 1991.

Very truly yours, VERMONT YANKEE NUCLEAR POWER CORP.

[ tt< -

Warren P Mur y M#

Senior V ce Pres e , Operations  ;

,cc: 1) USNRC Region I . .

l 475 Allendale Road King of Prussia, PA 19406.

2) USNRC R6sident Inspector, VYNPS o

-DP 0411 Rev. 3

Page 1 of 1 l '9105100355 910430

l. PDR' ADOCK 05000271 R. PDR [M%

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VERMONT YANKEE NUCLEAR POWER STATION MONTHLY STATISTICAL REPORT 91-04 FOR THE MONTH OF APRIL, 1991 DP 0411 Rev. 3 Page 1 of 1

=

i- OPERATING DATA REPORT ,

DOCKET NO. 50-271

DATE 910510

COMPLETED BY G.A. WALLIN TELEPHONE 18021257-7711 OPERATING STATUS

1. Unit-Names Vermont Yankee j

3.-Reporting Period: April NOTES:

3. Licensod Thermal Power (MWt):1593 4.LNameplate Rating (Gross MWe): 512

5. Design-Electrical Rating (Net MWe): 514(oc)'504(cc) l 6.-Maximum Dependable Capacity (Gross MWe): 115

'7 . Maximum-Dependable' Capacity (Net MWe): 121

8. If changes, occur in capacity ratings (Items Number 3 through 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 i 11 '. Hours in Reporting Period .

719.00 2879.00 161399.00

12. Number Of. Hours Reactor was Critical 562.80 2638.70 130827.33

13. Reactor Reserve Shutdown Hours 0.00 0.00 0.00  :

14. Hours Generator On-Line: 550.95_ 2599.25 127970.85 15.-Unit Reserve Shutdown. Hours. 0.00 0.00 0.00 16.' Gross'ThermalLEnergy Generated (MWH) 867786.50 4090168.00 189405471xQQ i 1

17.= Gross Electrical Energy-Generated 291614.00 1377923.00 631?5418.00 i

18. _ Net Electrical: Energy Generated (MWH) 279186.00 1221494.00 59953464.00 19.-Unit Service Factor 76.63 90.28 78.46 130. Unit Availability 1 Factor 76.63 90.28 78.46 131. Unit = Capacity Factor (Uning MDC Net)1 77.04 91.07 72.93

33. UnitLCapacity Factor (Using DER Net) 75.54 89.30 71.51 33.' Unit Forced: Outage Rate .

23.37 9.72 5.61 h

34. Shutdowns scheduled:over.next 6 months (Type, Date, and Duration of

, Eacht- N/A- ,;

-25. If-shut down at end of. report period, estimated date of-startup: N/A.

13 6. Units'In Test. Status (prior to commercial operation): N/A Forecast Achieved i

. INITIAL CRITICALITY-INITIAL ELECTRICITY COMMERCIAL OPERATION VYDPF 0411.01 DP;0411 Rev. 3

.Page 1 of 1-

.RT-No. 13.F01.19F

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.. , AVERAGE DAILY UNIT POWER LEVEL

• DOCKET NO. 50-271 UNIT Vermont Yankgg DATE 910510 COMPLETED BY G.A. WALLIN TELEPHONE f802)257-7711 MONTH April DAY AVERAGE DAILY-POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net) (MWe-Net)

1. 514 17. 516

2. 514 18. 516

3. 511 19, 515

4. 508 20. 515

5. , 509 21. 515

6. 509 22. 516 7.* 487 23. 318

8. 510 24. 0

9. 514 25. 0

10. 515 26. 0

11. 514 27. 0

12. 515 28. 0 13, 516 29. O i 14. 515 30. 39 i

l

15. 516 31. ---

16. 516

• -23 hour day INSTRUCTIONS:

On this format, list the average daily unit power level in MWE-Net for each day in the reporting month. Compute to the nearest whole megawatt.

VYDPF 0411.02 DP 0411 Rev. 3 Page 1 of 1 RT No. 13.F01.18V l'

UNIT. SHUTDOWNS AND POWER REDUCTIONS .

REPORT MONTH APRIL DOCKET NO 50-271 UNIT NAME Vermont Yankee DATE 910510 COMPLETED BY G.A. Wallin TELEPHONE (802)257-7711 1 2 3

! No. Date Type Duration Reason Method of License System Component Cause and Corrective a

(hours) Shutting Event Code Code Action to Prevent Down Report # 4 5 Recurrence Reactor 91-05 910423 F_ 168.05 B 3 91-09 ED XXXXXX Turbine trip / reactor scram due to a generator full load reject caused by

, switchyard battery maintenance l' F: Forced 2 Reason: 3 Method: 4 Exhibit G- Instructions S: Scheduled A-Equipment Failure-(Explain) 1 - Manual for Preparation of Data B-Maintenance or Test 2 - Manual Scram Entry Sheets for Licensc C-Refueling 3 - Automatic Scram Event Report (LER) File

D-Regulatory Restriction 4 - Other (Explain) (NUREG 0161)

E-Operator Training and License Examination 5 Exhibit I - Same Source VYDPF 0411.03 F-Administrative I

DP 0411 Rev. 3 G-Operational Error (Explain)

- Page 1 of 1 H-(Explain) 4

DOCKET No. 50-271 DATE 910510 COMPLETED BY G.A. WALLIN TELEPHONE (802)257-7711 REPORT MONTH APRIL EEM_ MARY OF OPERATING EXPERIENCES Hiahlichts Vermont Yankee operated at .75.8% of rated thermal power for the month.

Gross electrical generation was 291.614 MWHe or 75.1% design electrical capacity.

gperatina Summary The following is a chronological description of plant operations including other portinent items of interest for the month:

At the beginning of the reporting period the plant was operating at 99.9%

of rated thermal power.

910423 At 1448 hours0.0168 days <br />0.402 hours <br />0.00239 weeks <br />5.50964e-4 months <br />, switchyard battery maintenance resulted in a generator full load reject, turbine trip and subsequent reactor scram. (See Unit Shutdowns and Power Reductions) 910430 At 0300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />, the reactor was critical and a return to full power was initiated.

910430 At 1451 hours0.0168 days <br />0.403 hours <br />0.0024 weeks <br />5.521055e-4 months <br />, the turbine-generator was phased to the grid.

At the end of the reporting period the plant was operating at liull of rated thermal power.

VYDPF 0411.04 DP 0411 Rev. 3 Page 1 of 1 RT No. 13.F01.18X

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