ML19256A972

Monthly Operating Rept for Dec 1978

ML19256A972
Person / Time
Site:	Maine Yankee
Issue date:	01/12/1979
From:	Sjogren R Maine Yankee
To:
Shared Package
ML19256A969	List: ML19256A968 ML19256A972
References
NUDOCS 7901170207
Download: ML19256A972 (6)

Text

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'y MAINE YANKEE NUCLEAR POWER STATION MONTIILY STATISTICAL REPORT 78-12 FOR Tile MONTil 0F DECEMBER, 1978 79011702o-(

4 p..

OPERATING DATA REPORT DOCKET NO.

50-309 DATE 790112 C051PLETED BY P "

C ogren TELEPlf0NE (617) 366-P911 X2281 OPERATING STATUS

1. Unit Name:

MAINE YANKEE Notes December 1978

2. Reporting Period:

3. Licensed Thermal Power (SIWt):

2,630

4. Nameplate Rating (Gross SIWE):

864

5. Design Electrical Rating (Net alwe):

825

6. Stasimum Dependable Capacity (Gross SIWE):

990

7. 51asimum Dependable Capac;ty (Net SIWE):

910

8. If Changes Occur in Capacity Ratings (Irems Numbet 3 Through 7) Since Last Report. Gise Reasons:

9. Power Lesel To Which Restricted,if Any (Net 51We):

864 MWe approximate 1v 97%

10. Reasons e or Restrictions. If Any:

Because of maximum allowable steam flow through the r

I.P-Turbine.

(

This 51onth Yr.-to.Da te Cumulative

11. Ilours in Reporting Period 744 8.760

12. Number Of Ilours Reactor Was Critical 739.28 7.514.91 45.043.71

13. Reactor Reserve Shutdown llours

14. !!ours Generator On.Line 737.43 7,365.17,

43,523.17

15. Unit Resene Shutdown flours

16. Gross Thermal Energy Generated (SIWil) 1.83I.372 16,895,576 116,286,676

17. Gross Electrical Energy Generated (.\\lWill 622,740 5,629,640 29,867,810

18. Net Electrical Energy Generated (51Wil) 594,741 5,354,925 28.288.196

19. Unit Senice Factor 40.I 84.1 80.8

20. Unit Asailability Factor 99.I 84 1 80.8

21. Unit Capacity Factor (Using.\\lDC Net) 98.7 78.9 68.8

22. Unit Capacity Factor (Using DER Net) 06.9 76.2 66.3

23. Unit Forced Outage Rate 0

4.0 3.6

24. Shutdowns Scheduled Oser Nest 6 Stonths (Type. Date.and Dura: ion of Eachi:

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

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

Forecast Achiesed INITIAL CRITICALITY INITIAL ELECTRICITY Coil.\\lERCIA L OPER A TION (9/77)

AVERAGE DAILY L* NIT POWER LEVEL DOCKET NO.

50-309 UNIT Maine Yankee DATE 790112 C0\\lPLETED BY R.

M.

Siogre.

TELEPHONE (6171 766_on11 X2281 5!0NTil noco-ber 1978 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL

(.\\1We-Net )

(3lwe. Net )

1 R26 l7 824 824 823 18 3

826 gg 825 789 4

807 20 5

7.10

,i g 823 825 6

457 22 791 7

821 23 8

825 2.g 825 9

824 825 25 10 824 824 26 788 827 3

807 32 82.1 28 826 824 13 29 824 14 730 30 758 800 15 3,

16

' t INSTRUCTIONS On this format, list the aserage daily unit power lesel in.\\lWe Net for each day in the reportmg month. Compute to the nearest whole megawatt.

(9 /77 )

s _.

[

i UNIT SilUTDOWNS AND POWER REDUCTIONS DOCKET NO.

50-309 UNIT NAME Maine Yankee DATE 790112 REPORT MONDI December 197S COMPLETED BY R.

\\1. Siocren TELEPilONE

'6in 166 9011 X2281 Page 1 ot' 2 "k

-b,

.5?

3 k 5k Licensee E r, Cause & Correetive No.

Date y

3g I;

,g g 5 Event

??

$~g Action to 3 5 =g Report =

<E C E'

Prevent Recurrence

$E i2 e

u C

LR 12-4-78 F

7.75 A

1 m

liF IITEXCll-D Condenser tube leak in the "D" water-o 80".

12-5-78 box - iube plugged.

LR 12-5-78 F

7.42 A

1 NA IIF llTEXCll-D Condenser tube leak in the "B" water-to 80*.

box - Tube plugged.

5-78-4 12-5-78 F

6.57 B

3 NA IA INSTRU-X Electrical spike on RPS temperature channels resulting in a Thermal Margin Trip.

Investigation continuing.

I.R 12-11-78 F

11.97 A

1 NA IIF IITEXCll-D Condenser tube leak in the "B" water-to 80".

box - 2 tubes plugged.

LR 12-14-78 F

30.00 A

1 NA IIF llTEXCll-D Condenser tube Leak in the "B" Water-to 80.

12-15-78 box - 4 tubes plugged.

LR 12-20-78 F

10.17 A

1 NA IIF llTEXCll-D Condenser tube leaks in the "A" and to 80".

12-21-78 "B" waterbo.ses - 2 tubes plugged.

1 2

3 4

F: Forced Reason:

Method:

Exlubit G -Instiuctions S. Scheduled A-lkguipment Faihue (Explain) 1 Manual for Preparation of Data 11-Maintenance of Test 2-Manual Scram.

lintry Sheets for I.icensee C-Refueling 3 Automatic Scram.

livent Report (1.l:R) l'ile INilRIG D-Regulitory Rest riction 4-Olher (lixplain) 0161)

I'-Operator Training & l.icense lixamination F-Administrative 5

G-Operational I t ror (lisplain)

Esinbit I-Same Sontce 19/77)

Il-Ot her (lisplain)

DOCKET NO.

50-309 UNIT SilUTDOWNS AND POWER REDUCTIONS UNIT N AME Maine Yankee DATE

~90112 U n ~on COMPLETED BY r'

u REPORT MONTil f)eccher 1978 TELEPllONE

( b l -' T 166-9011 X22sl Pace 2 ot' 2 O

C

.5 g 3

4 Ei Licensee

,E t, E ",

Cause & Correctise 3=

4 jg5 Event 7m s~8 Action to No.

Dat e r-j~

15g Repor (E U EU Present Recurrence e

o c

LR 12-23-78 F

8.42 A

1 NA IIF llTEXCll-D Condenser tube leak in the "D" water-to 80 box - I tube plugged.

LR to 80~

12-28-78 F

6.67 A

1 NA IIF llTEXCll-D Condenser tube leak in the "B" water-box - 1 tube plugged.

LR to 80' 12-31-78 F

7.00 A

1 NA IIF 1:TEXCll-D Condenser tube leaks in the "D" water bo.s - 5 tubes plugged.

I 2

3 4

F: Forced Reasor..

Method:

Exlubit G - Instruciions S: Sched uled A-Equipment Failure (Explain)

I Manual for Preparation of Data B Maintenance or Test 2 Manaal Scram, lintry Sheets foi Licensee C Refueling 3 Automatic Scram.

Event Report (l.I'R)l'Je (NtlRI:G-D-Regulatory Restriction 4 Other (lixplain) 0161) 1 -Operator Training L l.icense lixamination F-Adounist rative 5

G-Operational Eiror (lixplatn)

Exinbit 1 - Same Source (9/77)

Il-Ot he r (lixplain )

DOCKET NO.

50-309 Maine Yankee UNIT DATE 790112 COMPLETED BY

_R.

M. Sjogren TELEPfl0NE (617) 366-9011 X2281 REPORT MONTli December 1978 SU50!ARY OF OPERATING EXPERIENCES At the beginning of the month the plant was operating at = 97# reactor power level limited by the 864 MWe maximum load permitted on the low pressure turbine blading.

On December 4th, and again on the 5th, load reductions to 80*6 were required to pl'ig a leaking condenser tube in the "D" and then "B" condenser waterboxes.

On December 5th a plant trip rerulted from an electrical spike impressed on the station grounding system. The spike caused the temperature sensing circuits of the TM/LP trip ctreuits to develop a higher than actual power level which led to the trip.

The plant was back on-line in about six hours.

The plant remained on-line for the remainder of the month at essentia1ly ful1 power (=97#,) with the exception of 5 additional load reductions to 80" to plug leaking condenser tubes in the "B" and "D" condenser waterboxes.

The load reductions occurred on the lith, 14th, 15th, 23rd, 28th, and 31st.