ML20070W083

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Monthly Operating Rept for Mar 1991 for Vermont Yankee Nuclear Power Station
ML20070W083
Person / Time
Site: Vermont Yankee Entergy icon.png
Issue date: 03/31/1991
From: Murphy W, Wallin G
VERMONT YANKEE NUCLEAR POWER CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
VYV-91-095, VYV-91-95, NUDOCS 9104120348
Download: ML20070W083 (6)
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Text

{{#Wiki_filter:- n. . . . . . . - . . - . . - . . . . . - . . . . .- - - . - . . . - . . - _ - - . - . . . . VbR$10NT YANKEE l NOCLEAR POWER CORPORATION 

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Vernon, Vermont 05354-0157 (802) 257 7711 (qhR ~ )/ - April 10, 1991 VYV 91-095 U.S. Nuclear Regulatory Commission ATTN Document Control Desk Washington, D.C. 20555 ,

Dear Sir:

Submitted herewith is the Monthly Statistical Report for the Vermont Yan)ee Nuclear Power Station for the month of March, 1991.. Very-truly yours, 

                                                                                . VERMONT YANKEE NUCLEAR POWER CORP.

w WarrenP[Murph $f Senior Vice Prefr de t, Operations cc: 1-) USNRC i Region I i 475 Allendale Road King of Prussia, PA 19406

2) USNRC Resident Inspector, VYNPS DP 0411 Rev. 3 Page 1 of 1 I

l.- 91v4120348 910331 ADOCK0500'g"{1 g {La

VERMONT YANKEE NUCLEAR POWER STATION MONTHLY STATISTICAL RE'vRT 91-03 FOR THE MONTH OF MARCH, 1991 DP 0411 Rev. 3 Page 1 of 1 l ( 

 ,         ,                           OPERATING DATA REPORT-
                ',                                            DOCKET NO.--        50-271 DATE       010410
                                                          -COMPLETED BY           u.A.                Wallin__.

TELEPHONE (802)257-7711 OPERATING STATUS l

1. Unit Name Vermont Yankee NOTES:
2. Reporting Period March
3. Licensed-Thermal Power (MWt): 1593
4. Nameplate Rating (Gross MWe): 540
5. Design Electrical Rating (Net MWe): 514(oc) 504(cc)
6. Maximum Dependable Capacity (Gross MWe): 535
7. Maximum Dependable Capacity (Net MWe): 504-
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
11. Hours-In Reporting Period 744.00 2160.00 160680.00
12. -Number Of Hours Reactor was Critical 659.90 2075.90 130264.53
13. Reactor. Reserve Shutdown Hours QuqQ 0.06 -0.00
14. Hours Generator On-Line 632.30 -2048.30 127419.90:
15. Unit Reserve Shutdown-Hours- 0.00 0.00~ 0.65
16. Gross Thermal Energy Generated (MWH) 993650.00 3222381.50 188537686.5Q
17. Gross Electrical Energy Generated 334039.00 1086309.00 62833804.00
18. Net-Electrical Energy Generated (MWH)320444.00 1042308.00- 59674278.00
19. Unit Service Factor 84,99 94.83 78.47
20. Unit Availability Factor 84.99 94.83 78.47
21. Unit Capacity Factor (Using MDC Net) 85.46 95.74
22. 72.91 Unit Capacity Factor (Using DER Net) _ 83.79 93.88- 71.50
23. Unit Forced Outage Rate 15.01
                                                                               % .17 -                          5.51
24. Shutdowns scheduled over next 6 months (Type,: Date, and Duration of Each): N/A
25. If shut down at end of report period, estimated date of-startup
26. N/A Units In Test Status (prior to commercial operation): N/A Forecast Achieved INITIAL CRITICALITY INITIAL ELECTRICITY COMMERCIAL OPERATION VYDPF 0411.01 ~~

DP 0411 Rev. 3 Page 1 of 1 RT No. 13.F01.19F 

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

AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-271 UNIT Vermont Yankee-- DATE 9T6410 COMPLETED BY G. A.' Wallin TELEPHONE ~(802)257-7711-MONTH March DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net) (MWe-Net)

1. 517 17. 0-
                                                           ~~~
2. 516 18, 85
3. 515 19. 484
4. 516 20, 514
5. 516 21, 515 6.- 515 2 2.- 515
7. 515 23. 515
                                                          "~
8. 515 24. 515
9. 515 25. 515
10. 514 26, 515
11. 513 '27.- 516
12. 464- 2 8 .- 514-
13. 478 29.: 514
             -14 .                                 0                                   30.                                                 514
15. 0 31. 514
16. O
                                                                                                                                 ~

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. VYDPr 0411.02 DP 0411 Rev. 3 

             -Page 1 of 1 RT No. 13.E01.18V

UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET N0 50-271 REPORT MODTH MARCH UNIT NAME ve_rmont Yankee DATE 910410 COMPLETED By G.A. Wallin . TELEPHONE 48S2)257-7711 1 2 Method of License System Component Cause and Corrective No. Date Type Duration Reason Shutting Down Event Code Code Action to (hours) Reactor 3 Reporte 4 5 Prevent Recurrence i 91-02 910312 S 0.00 B,H N/A N/A RB CONROD Turbine bypass valve testing, rod pattern exchange and scheduled maintenance. 91-03 910313 F 103.95 A 3 91-05 EA CKTBBK Reactor scrammed due to a switchyard ground and resultant generator full load reject. 91-04 910317 F 7.75 A 1 N/A CF VALVEX Excess 17e drywell leakage rate caused by RHR-46A valve Yalve bonnet was tightened. 1 F: Forced 2 Reasons 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 Licensee C-Refuelt g 3- Automatic Scras Event Report (LER) File D-Regulatory Restriction 4- Other (Explata) (NUREG 0161) E-Operator Training and License Examination F-Administrative 5 Exhibit I - Same Source vYDPF 0411.03 G-Operational Error (Explain) DP 0411 Rev. 3 H-{ Explain) - Rod pattern exchange Page 1 of 1 l i a 4 e 

       .    ,                                              DOCKET NO. 10-271 UNIT Vermont Yenkon
              *',                                                 DATE 910410 COMPLETED BY G.A. Wallin TELEPHONE (802)257-7711 REPORT MONTH     March

SUMMARY

OF OPERATING EXPERIENCES Highlights d Vermont Yankee operated at 83.8% of rated thermal power for the month. Gross electrical generation was 334,039 MWHe or 83.1% design electrical capacity. Operating Summary The following is a chronological description of plant operations including other pertinent items of interest for the month: At the beginning of the reporting period the plant was operating at 99.9% of rated thermal power. 910312 At 0715 hours, initiated a power reduction to 70% to perform turbine bypass valve testing, a rod pattern exchange and scheduled maintenance on the 381 transmission line. 910312 At 0950 hours, at 70% power initiated turbine bypass valve testing. (See Unit Shutdowns and Power Reductions) 910312 At 1005-hours, completed turbine bypass valve testing and initiated a rod pattern exchange. (See Unit Shutdowns and Power Reductions) 910312 At 1224 hours, completed the rod pattern exchange. Remaining at 79% power until maintenance of the 381 transmission line is concluded. 910312 At 1454 hours, completed 381 transmission line maintenance and began a return to full power. 910313 At 2228 hours, the reactor scrammed due to a switchyard ground and resultant generator full load reject._ (See Unit Shutdowns and Power Reductions) 910317 At 0249 hours, the reactor was critical. 910317 At 1710 hours, the reactor was sub-critical to repair a leak on the RHR-46A valve. (See Unit Shutdowns and Power Reductions) 910318 At 0055 hours, following valve repairs the reactor was critical and a return , full power was initiated. 910318 At 1410 hours, the turbine-generator was phased to the grid. At the end of the reporting period the plant was operating at 99.8% of rated thermal power. VYDPF 0411.04 ' DP 0411 Rev. 3 Page 1 of 1 RT No. 13.rO1.18X}}

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