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Union Electric l'O Ilox 620Callaway Plant Fulton, Mo 65251*

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June 15,1998

U. S. Nuclear Regulatory CommissionAttn: Document Control DeskMail Stop PI-137

/, Washington, DC 20555-0001

ULNRC-3846

UEGentlemen:

DOCKET NUMBER 50-483UNION ELECTRIC CO.

CALLAWAY PLANT UNIT IFACILITY OPERATING LICENSE NPF-30

MONTillN OPER/. TING REPORTMay 1998 ;

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The enclosed Monthly Operating Report for May 1998 is submitted pursuant toSection 6.9.1.8 of the Callaway Unit 1 Technical Specifications.

/n aeonR. D. AffolterManager, Callaway Plant

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Enclosure

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9806100209 9905318'd

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a subsidiarp J Amoren Cerpershon

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ULNRC-3846. ' ' June 15,1998

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cc: Mr. Ellis W, MerschoffRegional Administrator*

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U.S. Nuclear Regulatory CommissionRegion IV611 Ryan haza Drive, Suite 400Arlington, TX 76011-8064

Senior Resident InspectorCallaway Resident Offic-U.S. Nuclear Regulatory : s :mmission8201 NRC RoadSteedman,MO 65077

Ms. Kristine M. Thomas (2 copies)Licensing Project Manager, Callaway PlantOffice of Nuclear Reactor Regulation

. U. S. Nuclear Regulatory CommissionMail Stop 13E16Washington, DC 20555-2738

Manager, Electric DepatmentMissouri Public Service CommissionPO Box 360Jefferson City, MO 65102

Mr. Thomas A. BaxterShaw, Pittman, Potts, & Trowbridge2300 N. Street N.W.Washington, DC 20037

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Enclosure.,*

ULNRC- 3846,.

June 15,1998

- DOCKET 140.: 50-483UNIT NAME: CALLAWAY UNIT 1COMPLETED BY: M. A. HolmesTELEPHONE: 573/676-8842FAX: 573/676-4202

PART A - OPERATIONS SUMM ARY:

On 4/1/98, at 0500, Callaway started to coastdown from 86% in preparation for refueling. On 4/3/98, at0032. Callaway opened the main generator breakers to enter the plant's ninth refueling outage. On5/4/98, at 0645, Callaway's ninth refueling outage ended when the main generator breakers were closed.On 5/9/98, at 0200, power reached 100% where it remained the remainder of the month.

PART B - PORV AND SAFETY VALVE SUMMARY:

None.

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Enclosure.

; ULNRC - 3846June 15,1998

* * PART CAVERAGE DAILY UNIT POWER LEVEL

DOCKET NO: 50-483UNIT: Callaway Unit 1COMPLETED BY: M. A. HolmesTELEPHONE: 573/676-8842FAX: 573/676-4202

MONTH: MAY 1998

AVERAGE DAILY POWER AVERAGE DAILY POWERLEVEL LEVEL

DAY (MWe-Net) DAY (MWe-Net)

1 0 17 1.153

2 0 18 1.149

3 0 19 1.145

4 184 20 1.149

5 443 21 1.155

6 488 22 1.156

7 841 23 1.151

8 1.063 24 1.156

9 1.152 25 1.159

10 1.159 26 1.158

.I1 1.160 27 1.156'

12 1.151 28 1.147

'13 1.149 29 1.102

14 1.145 30 1.144

15 1.143- 31 1.145

16 1 156

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EnclosureULNRC - 3846.

;- ' June 15,1998

PART DOPERATING DATA IEPORT

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DOCKET NO.: 50-483UNIT NAME: CALLAWAY UNIT 1COMPLETED BY: M. A. HolmesTELEPflONE: 573/676-8842FAX: 573/676-4202

OPERATING STATUS:(MAY) (YTD) (CUM)

1. REPORTING PERIOD:GROSS liOURS IN REPORTING PERIOD: 744 3,623.0 117,852.5

2 CURRENTLY AUTilORIZED POWER LEVEL (MWt): 3565 MAX. DEPEND. CAPACITY(MWe-Net): 1125DESIGN ELECTRICAL RATING (MWe-Net): 1171

3. POWER LEVEL TO WlilCil RESTRh. TED (IF ANY) (MWe-Net): 100 %

4. REASONS FOR RES'IT11CTION (IF ANY):

Tills MONTII VR TO DATE CUMULATIVE

5. NUMBER OF llOURS REACTOR WAS CRITICAL 701.1 2,911.8 104,748.3

6. REACTOR RESERVE SliUTDOWN llOURS 0 0 0

7. HOURS GENERATOR ON-LINE 665.2 2,873.7 103,139.1

8. UNIT RESERVE SilUTDOWN IIOURS 0 0 0

9. GROSS TiiERMAL ENERGY GENERATED 2,203,216 8,429,916 346,265,609

(MWil)10. GROSS ELECTRICAL ENERGY GENERATED 741,731 2,898,016 118,147,665

(MWii)11. NET ELECTRICAL ENERGY GENERATED 702,702 2,738,977 112,407,330

(MWil)| 12. REACTOR SERVICE FACTOR 94.3 80.4 88.9

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| 13. REACTOR AVAILABILITY FACTOR 94.3 80.4 88.9|

14. UNIT SERVICE FACTOR 89.4 79.3 87.5

15. UNIT AVAILABILITY FACTOR 89.4 79.3 87.5

16. UNIT CAPACITY FACTOR (Using MDC) 84.0 67.2 84.8

17. UNIT CAPACITY FACTOR (Using Design MWe) 80.7 64.6 81.5

|18. UNIT FORCED OUTAGE RATE 0.0 0.0 2.06

19. SifUTDOWNS SCIIEDULED OVER NEXT 6 MONTilS (TYPE, DATE, AND DURATION OF EACH):Refueling Date: Refuel 9 ended 5/4/98Duration: 30 days

20. IF SliUT DOWN AT END OF REPORTING PERIOD, ESTIMATE DATE OF STARTUP:

Page 3 of 4-

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