ML19208A749

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Monthly Operating Rept for Aug 1979
ML19208A749
Person / Time
Site: Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date: 09/12/1979
From: Sjogren R
VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML19208A748 List:
References
NUDOCS 7909170409
Download: ML19208A749 (7)
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VERMCNT YANKEE NUCLEAR POWEF STATION MONTHLY STATISTICAL REPORT 79-08 FOR THE MONTH OF AUGUST, 1979 3bb270 7 9 0917 09c)7

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OPERATING DATA REPORT DOCKET NO.

50-271 DATE 790912 C031PLETED BY R. t Siogren TELEPHONE (617) 366-9011 X2281 OPERATING STATUS Vermone Yankee Notes

1. Unit Name:
2. Reporting Period: Auzust 1970 1,593
3. Licensed Thermal Power (SIWt):
4. Nameplate Rating (Gross SIWE): 540
5. Design Electrical Rating (Nec Slwe):

514 (open cycle) 504 (closed cycle)

6. Sfaximum Dependable Capacity (Gross 5twe): 5'5
7. Staximum Dependable Capacity (Net 31We): 504
8. If Changes Occur in Capacity Ratings (Items Number 3 Through 7) Since Last Report. Give Reasons:
9. Power Level To Which Restricted. If Any (Net 31We):
10. Reasons For Restrictions.If Any:

(- This Sionth Yr..to.Date Cumulative .

11. Hours in Reporting Period 744 5,831 ---
12. Number Of Hours Reactor Was Critical 660 5.339.31 49,229.14
13. Reactor Reserve Shutdown Hours 0 0 0
14. Hours Generator on-Line 643 5.308.78 . 47l441.78
15. Unit Reserve Shutdown Hours 0 0 0
16. Gross Thermal Energy Generated (31WH) 98o.639.5 8.052.072.7 66.438.890.2 .
17. Gross E!ec:rical Ener;y Generated (SIWH) 287.213 , _ .

2.691.078 22.030,546 267,921 2.553,707 20,873,230

18. Net E!ectrical Energy Generated (31WH) '
19. Unit Service Factor 100 91.7 77.8
20. Unit Availability Factor 100 91.7 77.8
21. Unit Capacity Factor (Using .\tDC Net) 91.0 89.2 68.0
22. Unit Capacity Factor (Using DER Net) 89.2 87.4 66.7
23. Unit Forced Outage Rate 7.36 1.9 6.6
24. Shutdowns Scheduled Oser Next 6 Stonths (Type. Date,and Duration of Each1:

Refuelin? Sectember 22, 1979 - 7 weeks

25. If Shur Down At End Of Report Period. Estimated Date of Startup:
26. Units in Test Status tPrior to Commercial Operation): Forecast Achiesed

- INITIA L CRITICA LITY

, INITIA L ELECTRICITY CO3131ERCIAL OPERAT10N b kh D .i.(orl7)

AVERAGE DA!LY UNIT POWER LEVEL DOCKET NO. 50-271 UNIT Vermont Yankee DATE 790912 CO.\fPLETED BY R. M. Sj ogren TELEPHONE (617) 366-9011 X2281 AIONTH August 1979 PD lg ylgl l ]I jgl DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (51We-Net) (31We-Net)

I 267 g7 423 2 373 13 438 3 462 g9 435 4 459 20 435 5 457 21 436 6 460 22 434

\ 7 459 23 434 8 453 24 431 9 277 25 430 10 0 435 26 11 0 ,7 430 12 0 428 3

13 175 ;9 429 34 304 30 427 15 173 3, 433 16 369 INSTRUCTIONS On this format.!ist the average d:dy unit power level in N!We Net for each day in the reporting month. Compute to the nearest whole megawatt.

(4/771 b I$ i5 b ke

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UNITSilulDOWNS AND POWER ItEDUCTIONS ')OCK ET NO. W 271 UNil NAME Verment Yankee, C*i

  • DA1E _790'312 IN R EPOR T MON 111 August 1979 COMPl.E 1 El> 11Y _ R . F1. SJpgren . _

T 01.1 PilONE f617) 366-9011

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.e X2281 Q Q

1 Nii . Date g

.$ E 3g

}; jje Y l it ensee Event

,E3, 'q, Cause & roerective g7 n.1 Attion to F

$E $ T,

e. d cg Repori
  • in u gu Psevent iteturrence u

O 79-15 790809 F 88.0 A 2 -- --

CB VALVEX A - lionnet and packing leaks on the "A" Recire Discharge Valve. Valve was repacked and seal welded.

79-16 790814 F 13.0 3 11 -- --

XX XXXXXX 11 - Power spikes causeil by instabil t-ties in the electronic pressure regulator.

I 2 '3 4 l'. I'.used Iteason: Meilmd: 1:sinliii G - Instructions S. S(licdulcil A.l <inipment Fadnic (lixplain) I Mannal 11 Maintenance of Test Im Pice. nation nI Data 7 Manual Scram. Entry Slicets f or 1.itensec C ltelocling 3-Antunutic Scram.

D llegulatney Itesteiction Event Itcenal (I.I la life (Niliti:G-4 Ollier(lixplain) 0161) 1 Opciator l~saining A License Examinallon 1: Ailnn ni .t e a tiw S

G Opci.iiinn I I is.. ( r.m plain) 08/17) 11 Ollice (l.' mpi.iin) Emini.it I Same Sonise

DOCKET NO. 50-271 &e**

N UNIT Vermont Yankee W D

DATE 790912 7)

COf fPLETED liY R. M. Sjogren TELEPil0NE (617) 366-9011 X2281 SAFETY ItELATED !!AINTENANCE SilEET 1 of 2 NAIUltli 01: Llilt uit Olli AGE flAll UNC'l lON EQUII'llEN T PIAINTl! NANCE _ NU 111Lil CAUSti 1:LSULi COIRECT1Vli ACl10N ,

RHR Pipe liestraint Preventive NA Unknown Loose Bolting Tightened Bolting MR 79-299 "A" Recirc Pump Dis- Corrective NA Worh Packing Leakage Repacked Valve charge Valve (V2-53-A) MR 79-497 Drywell Air Purge Inlet Corrective LER Foreign !!aterial Valve Would Not Disassembled and Cleaned Valve (V16-20-22B) MR 79-540 79-16/3L In Valve Open Valve "B" RilR Service Water Corrective NA Clogged Strainer liigh AP Cleaned Strainer Pump Strainer  !!R 79-585 "A" Recirc Pump Dis- Corrective NA Normal Operation Bonnet Leakage Seal Welded the Bonnet charge Valve (V2-53-A) MR 79-606 Ilydraulic Control Unit Corrective NA Normal Wear Leakage Past Valve Overhauled Valve 26-27, Control Valve MR 79-609 Seat CR 13-126 IIPCI Steam Supply Valve, Corrective NA Unknown llousing Cover Replaced Parts as V23-15 Motor Operator MR 79-611 Cracked Necessary llydraulic Control Unit Corrective NA Normal Operation Nitrogen Leakage Replaced "O" Ring and 26-27, Nitrogen Cylinder MR 79-627 Gaskets Fitting

DOCKET NO. 50-271 LO i%

UNIT Vermont Yankee if DATE 790912 CO ti'LETED liY R. M. Slogren TELEP110NE (617) 366-9011 X2281 SAFliTY l'l!LNil!D !!Alfil'EtlANCE SilEET 2 of 2 TJNIUltti 01 LliR OR OUI'AGli ilAll UNC~l lO!1

!!QUll'fll!NT MAINTLNAf1CE NUilBER CAUSli ItLSU Li' ColulECIIVli ACllON AP RM "B" Corrective NA Blown Fuss Inoperative Replaced Fuse MR 79-631 MSIV 80A Corrective LER Binding Ginide Roda Valve would not Dressed Guide Rods MR 79-632 79-20/3L open "A" Emergency Diesel Correct ive NA Broken Instrument Compressor Would Replaced Tubing Generator Air Compressor MR 79-662 Tubing Start at 205 lbs.

Instead of 220 lbs,

DOCKET NO. 50-271 UNIT Vermont Yankee DATE 790912 COMPLETED BY R. M. Siogren TELEPHONE (6171 366-9011 X2281 REPORT >!ONTH August 1979 SLSB!ARY OF OPERATING EXPERIENCES Fighlights Vermont Yankee operated at 75.1% of rated thermal power for the month of August, 1979. Gross electrical generation for the month was 287,213 MWHe, or 71.5% of design electrical capacity.

Operations Summarv The follorine is a chronological description of plant operations including other pertinent items of interest for the month:

8-1 At the beginning of the report period, the plant was increasing power to 95% following repairs on the "A" Recire MG Set Lube Oil Cooler Service Water Valve.

8-9 At 1820 hours0.0211 days <br />0.506 hours <br />0.00301 weeks <br />6.9251e-4 months <br /> the plant was shut down to repair a bonnet leak on the "A" Recire Pump Discharge Valve. Reactor startup commenced at 2005 hours0.0232 days <br />0.557 hours <br />0.00332 weeks <br />7.629025e-4 months <br /> on 8-12, with the reactor achieving criticality at 0135 hours0.00156 days <br />0.0375 hours <br />2.232143e-4 weeks <br />5.13675e-5 months <br /> on 8-13.

8-14 At 1803 hours0.0209 days <br />0.501 hours <br />0.00298 weeks <br />6.860415e-4 months <br /> the reactor automatically scrammed due to power spikes caused by instabilities in the electronic pressure regulator. Reactor startup commenced at 2235 hours0.0259 days <br />0.621 hours <br />0.0037 weeks <br />8.504175e-4 months <br />. The reactor was critical beginning at 0210 hours0.00243 days <br />0.0583 hours <br />3.472222e-4 weeks <br />7.9905e-5 months <br /> on 8-15. The generator was phased to the grid at 0727 hours0.00841 days <br />0.202 hours <br />0.0012 weeks <br />2.766235e-4 months <br />.

8-31 At the conclusion of this report period, the plant was in the end of cycle coastdown, and was operating at 89?. of rated the rmal power.

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