ML19332G145

Monthly Operating Rept for Nov 1989 for Cooper Nuclear Station.W/891208 Ltr

ML19332G145
Person / Time
Site:	Cooper
Issue date:	11/30/1989
From:	Horn G, Wietharn K NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CNSS898406, NUDOCS 8912200215
Download: ML19332G145 (5)

Text

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COOPER NUCLEAR ST ATION

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. Nebraska Public Power District

.CNSS898406 December 8, 1989 Document Control Desk

U.S. Nuclear Regulatory Commission Washington, D.C. ~20555 .

Subject:

' Monthly Operating. Status Report for November 1989, Docket No. 50-298 Gentlemen: i Enclosed for your information and use is the Cooper Nuclear Station Monthly.

Operating Status Report for November 1969. The report includes Operating

., Status Average Daily Unit Power I,evel Unit Shutdown Data, and a Narrative

l. Summary of Operating Experience.

Should you have any comments or require additional information regarding this l report.:please contact me.

l ' Sine rely, 1-4, W C . <(1 lorn

! Diviis on Manager of l Nuclear Oper tions GRil/KJW:nd l Enclosure l'

cc: G. D. Watson w/ enc.

R. D. Martin w/ enc.

l a-8912200215 891208 i l

PDR ADOCK 05000298; 1 R PNU )

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h-5' 'l OPERATIONS NARRATIVE Cooper Nuclear Station

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' November 1989-i

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i 'A 27 5' percent reductionJin power occurred'on November 12 due to a loss of:

r feed pump. turbine control, forcing the operator to trip a-recirculation: pump ~

t in order to reduce. power and recover vessel level.. The feed pumpLturbine control system.was repaired'and the plant returned to normal; full _ power Joperation on-November 18,;1989.

On' November-25, a failure of'the post-filter assembly of the "B" instrument:

- air dryer caused-a'l'oss.of plant air supply.-.As main steam isolation valves (MSIVs)' started _. drifting closed, as_a result of the decreasing air' pressure, lthe MSIV not full-open signal triggered an automatic scram. The plant-remained shutdown'through the_end of' November wh11e' instrument air dryer-

-repairs were completed and system testing was-performed.

1 A. capacity factor of'80.0 per_ cent-was_ achieved'for the month of-November.

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,: L AVERAGE DAILY UNIT POWER LEVEL-  ;

DOCKET NO. 050-0298 UNIT CNS DATE_ December 8, 1989 COMPLETED BY K. J. Wietharn ,

TELEPHONE (402) 825-3811 MONTH November 1989 DAY- AVERAGE DAILY-POWER LEVEL DAY AVERAGE DAILY POWER LEVEL

-(MWe-Net) (MWe-Net) 1 770 17 749-2 771- 18 741 [

3 772 19 688 4 773 20 773 5 769 21 772-6 '771 22 772 7' 772 23 _

764 8 771 _ 24 773-

-9 772 25 717 10- 771 26 o I

11 766 27 o p

12 650 28 o 13 -493 29 0 l-14 543 30 0 15 664 31 --

16 73 1

INSTRUCTIONS L On this format, list the average daily unit power level in MWe-Net 'or each day in the reporting month. Compute to the nearest whole egawatt.

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OPERATING DATA REPORT DOCKET NO.. -050-0298

- DATE December 8, 1989 COMPLETED BY K. J. Wietharn TELEPHONE (402) 825-3811 OPERATING STATUS

1. Unit Names Cooper Nuclear Station Notes

2. Reporting Feriod: November 1989

3. Licensed Thermal Power (Wt): 2381

4. Nameplate Rating (Cross MWe): 836

5. Design Electrical Rating (Net NWe): 778

6. Maximum Dependable Capacity (Cross NWe): 787

7. Maximum Dependable Capacity (Net MWe): 764 _

8. ~ If Changes Occur in Capacity ratings (Items Number 3 Through 7) Since Last Report, Cive Reasons:

9. Power Level To Which Restricted, If Any (Net MWe):

10. Reasons For Restriction, If Any:

This Month Yr.-to Date Cumulative

11. Hours In Reporting Period 720.0 8,016.0 135,169.0

12. Number of Hours Reactor Was Critical 598.3 5,932.4 101,907.7 l

13. Reactor Reserve Shutdown Hours 0.0 0.0 0.0 h 14 Hours Generator On-Line 598.3 5,870.3 100,304.9

15. Unit Reserve Shutdown Hours 0.0 0.0 0.0

16. Cross Thermal Energy Cenorated (MWH) 1.357.366.0 13.241,136.0 200,971,860.0

17. Cross Electrical Energy Generated (MWH) 454.644.0 4.382.909.0 64,775,730.0

18. Het Electrical Energy Generated (MWH) 440.226.0 4.245,376.0 62,474,610.0

19. Unit Service Factor 83.1 73.2 74.2

20. Unit Availability Factor 83.1. 73,2 74.2

21. Unit Capacity Factor (Using MDC Net) 80.0 64.3 60.5

22. Unit Capacity Factor (Using DER Net) 79.6 65.1 59.4

23. Unit Forced Outage Rate 16.4 "0. 4.3

24. Shutdown Scheduled Over Next 6 Months (Type, Date, and Duration of Each):

Refueling and Maintenance Outage 13, scheduled March , 1990; S week duration.

25. If Shut Down At End of Report Period, Estimated Date of Startup: December 1, 1989

24. Units In Test Status (Prior to Commercial Operation): Forecast Achieved INITIAL CRITICALITY INITIAL ELECTRICITY C0KMERCIAL OPERATION

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, a UNIT SHUTDOWNS AND POWER REDUCTIONS ' DOCKET N0; 1050-0298' $ M UNIT NAME- Cooper MuClear Stationx

.DATE December 8,-1989- +

COMPLETED BY. K. J. Wietharn' REPORT MONTH November 1989  : TELEPHONE _ (402) 825-3811 Method of Licensee 4 3 Cause & Corrective Duration Shutting Event System Coc:ponent ' Action to y 2 3 Prevent Recurrence No. Date Type (Hours) Reason Down Reactor Report # Code Code' 89-10 891112 F 0 A 5 N/A JK -SC Load reduced when Operators intential?>;

tripped a Reactor Recirculation pump ,i to-recover level'from-lossJofa feed.

pump. The feed pump turbine ~ control-valve pncumatic: positioner orifice was blocked by a loose meta l . chip ,

causing closure of the valve'on. loss-of motive air and an ensuing decrease in turbine. speed without a pump. trip.

The metal chip was removed during, inspection.

89-11 891125 F 121.7 A 3 * *

• An automatic' reactor scram occurred due to MSIV drift and subsequent closure trip. signal when an instrument air dryer post-filter element caught' fire and the post-filter vessel f ailed, resulting in loss of instrument air.

The dryer- temperature . limit switch.was determined to be faulty during instru--

ment-air l system troubleshooting and' testing. _Both the switch and post-dryer filter were' replaced.during sub-sequent maintenance. The post-dryer.

filter media was uncraded to'n hich temperature element.

1 F: Forced 2 Reason: 3 Method: 4 ' Exhibit G - Instructions for S: Scheduled A - Equipment Failure (Explain) 1 - Manual Preparation of Data Entry B - Maintenance or Test 2 - Manual Scram . Sheets for Licensee Event C - Defueling .

3 - Automatic Scram-- Report (LER) File (NL' REG-0161)

D - Regulatory Restriction .

'4 - Continued E - Operator Training & License Examination 5 - Reduced Load 5 .. Exhibit 1 -Same Source F - Administrative 6 - Other G - Operational' Error (Explain)'

H - Other (Explain)

• LER Number, System Code, and Component Code have not been; designated at the time:of:this' report.: -

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