ML20044D004

Monthly Operating Rept for Apr 1993 for Vermont Yankee Nuclear Power Station.W/930510 Ltr

ML20044D004
Person / Time
Site:	Vermont Yankee
Issue date:	04/30/1993
From:	Reid D, Wallin G VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BVY-93-048, BVY-93-48, VY-RCE-93-018, VY-RCE-93-18, NUDOCS 9305140289
Download: ML20044D004 (6)

Text

. ,

. VE'RMONT YANKEE 'j N.UCLEAR POWER CORPORATION

,;hbN P.O. Box 157. Governor Hunt Road Vernon, Vermont 05354-0157 s

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(802) 257-7711

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P May 10,1993 VY-RCE-93-018 BYY 93-048 >

U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attn: Document Control Desk [

Reference:

a) License No. DPR-28 (Docket No. 50-271)

Dear Sir:

l Submitted herewith is the Monthly Statistical Report for the Vermont Yankee Nuclear Power Station for the month of April,1993.

Very tmly yours, Vermont Yankee Nuclear Power Corporation

(~ ,

Donald A. Reid Vice President, Operations cc: USNRC, Region I USNRC Resident Inspector, VYNPS DP 0411 Rev. 4 Page1 ofI

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~ / I 93051402R9 930430 / ,

.PDR 'ADOCK 05000271 /

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PDR 1 J,

VERMONT YANKEE NUCLEAR POWER STATION MONTHLY STATISTICAL REPORT 93-04 FOR TIIE MONTII OF APRIL 1993 DP 0411 Rev. 4 Page1 ofI

eli l7 OPERATING DATA REPORT 3

, DOCKET NO.50-271 {

. DATE 930510 -t COMPLETED BY G.A. WALLIN  !

TELEPHONE (802)257-7711 -l OPERATING STATUS j

1. Unit Name: Vermont Yankee i

2. Reporting Period: April NOTES: j

3. Licensed Therral Power (MWt) :1593

4. Nameplate Rating (Gross MWe): 540

5. Design Electrical Rating (Net MWe): 514(oc) 504 (cc) f

, t

6. Maximum Dependable Capacity (Gross.MWe): EXE

7. Maximum Dependable Capacity (Net MWe): 104 i

8. If changes, occur in capacity ratings (Items Number 3 through 7) since j last report, give reasons:

N/A i

9. Power level to which restricted, if any(Net MWe): N/A j

10. Reasons for restrictions, if any: N/A [

This Month' Yr-to-Date Cumulative -!

11. Hours in Reporting Period 719.00 2879.00 178943.00 l

12. Number Of Hours Reactor was Critical 508.42 2668.42- 146864.77  ;

13. Reactor Reserve Shutdown Hours 0.00 0.00 0.00

14. Hours Generator On-Line 485.30 2645.30 143899.94

15. Unit Reserve Shutdown Hours 0.00 0.00 0.00

. 16. Gross Thermal Energy Generated (MWH) 739029.50 4172181.00 214243247.00 ,

17. Gross Electrical Energy Generated 246877.00 1405333.00 7?390491.00 .

18. Net Electrical Energy Generated (MWH)-'236818.00 _1349833.00 67824708.00 [

19. Unit Service Factor 67.50 91.88 79.66 -!

20. Unit Availability Factor 67.50 91.88 79.66  ;

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21. Unit Capacity Factor (Using MDC Net) 65.35 93.03 74.49

22. Unit Capacity Factor (Using DER Net) 64.08 91.22 73.05_ l

23. Unit Forced Outage Rate 32.50 8.12 5.25-

24. Shutdowns scheduled over next 6 months (Type, Date, and Duration of' i Each: 1993 Refuelino Outage scheduled to begin on August 27, 1993 '

and last for a six week period.

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

25. Units In Test Status (prior to commercial operation) : N/A }

Forecast Achieved 1 INITIAL CRITICALITY INITIAL ELECTRICITY [

COMMERCIAL OPERATION [

VYDPF 0411.01  ;{

DP 0411 Rev. 4 j

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.. .. . . . - . . - - . . . = .~ . -- . . . - . . . . . _ _

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. . AVERAGE DAILY UNIT POWER LEVEL .;

i

. DOCKET NO. 50-271  ;

. ' UNIT Vermont Yankee  !

DATE 930510 h COMPLETED BY G.A. WALLIN TELEPHONE (802)257-7711  ;

i MONTH April f

i DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL  !

(MWe-Net) (MWe-Net) j

1. 516 17. 266 f

[

-2. 516 18. 488 '

3. 516 19. 516 j

.04. 493 20. 516  !

5. 514 21. 516 i

6. 350 22. 516 l

7. 11 23. 516

8. 0 24. 516

9. 0 25. 515 t

10. 0 2G. 516 i

11. 0 27. 516 l i

12. 0 28. 515 '

13. 0 29. 515  !

14. 0 30. 514

15. 0 31. ---

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16. 10 *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. 4  ;

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UNIT SHUTDOWNS AND POWER REDUCTIONS REPORT MONTH APRIL DOCKET NO 50-271 UNIT NAME Vermont Yankee DATE 930510 ,

COMPLETED BY G.A. Wallin TELEPHONE (802)257-7711 1 2 3 4 5 No. Date Type Duration Reason Method of License System Component Cause and Corrective (haurs) Shutting Event Code Code Action to Prevent Down Report # Recurrence Reactor  ;

93-03 930406 S 0.00 B,H* 4 N/A RB CONROD Single rod scram

. Power testing and a Rod Reduction Pattern Exchange.

93-04 930406 F 233.70 B 1 N/A RB CONROD Manually shutting down due to a leak on the "B" feedwater discharge header P iP ing.

(

l 93-05 930406 F 0.00 B 1 RB CONROD Encountered problems lLER93-05 with " Notch 46" slow control rod insertion times, i

1 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 License C-Refueling 3 - Automatic Scram Event Report (LER) File D-Regulatory Restriction 4 - Other (Explain) (NOREG 0161)

E-Operator Training and License Examination 5 Exhibit I - Same Source VYDPF 0411.03 F-Administrative DP 0411 Rev. 4 G-Operational Error (Explain) l Page 1 of 1 *1l- ( Explain) - Control Rod Pattern Exchange

' DOCKET NO. 50-271 DATE 930510 >

COMPLETED BY G.A. WALLIN TELEPHONE (802)257-7711 REPORT MONTH Acril

SUMMARY

OF OPERATING EXPERIENCES Hichliohts Vermont Yankee operated at 64.5% of rated thermal power for the month.

Gross electrical generation was 246,877 MWHe or 63.6% design electrical capacity.

Operatino Summary The following is a chronological description of plant operations including i other pertinent items of interest for the month: l At the beginning of the reporting period the plant was operating at 99.9% i of rated therral power. '

930406 At 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />, initiated a power reduction to minimum recirculation t flow to perform surveillance, single rod scram testing, and a  ;

rod pattern exchange.

930406 At 0350 hours0.00405 days <br />0.0972 hours <br />5.787037e-4 weeks <br />1.33175e-4 months <br />, at minimum recirculation flow, initiated single rod  !

scram testing. (See Unit Shutdowns and Power Reductions) 930406 At 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br />, initiated a control rod pattern exchange. (See Unit Shutdowns and Power Reductions)  !

.i 930406 At 1005 hoars, completed the control rod pattern exchange.

930406 At 1135 hours0.0131 days <br />0.315 hours <br />0.00188 weeks <br />4.318675e-4 months <br />, completed single rod scram testing. Problems j encountered with " Notch 46" slow control rod insertion times. ,

(See Unit Shutdowns and Power Reductions) 930406 At 2238 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.51559e-4 months <br />, initiated a reactor shutdown due to a leak on i the "B" feedwater discharge header piping. (See Unit Shutdowns l

and Power Reductions)  ;

930407 At 0203 hours0.00235 days <br />0.0564 hours <br />3.356481e-4 weeks <br />7.72415e-5 months <br />, removed the turbine-generator from the grid.

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930407 At 0543 hours0.00628 days <br />0.151 hours <br />8.978175e-4 weeks <br />2.066115e-4 months <br />, the reactor was sub-critical.

930416 At 0118 hours0.00137 days <br />0.0328 hours <br />1.951058e-4 weeks <br />4.4899e-5 months <br />, the reactor was critical.

930416 At 2045 hours0.0237 days <br />0.568 hours <br />0.00338 weeks <br />7.781225e-4 months <br />, the turbine-generator was phased to the grid and  ;

a return co full power was initiated.

i At the end of th- reporting period the plant was operating at 99.8% of rated thermal power.

UYDPF 0411.04

'DP 0411 Rev. 4 .

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