ML20248M302

Monthly Operating Repts for May 1998 for Dresden Nuclear Power Station,Units 1,2 & 3

ML20248M302
Person / Time
Site:	Dresden
Issue date:	05/31/1998
From:	Abrell G, Heffley J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-REGGD-01.016, RTR-REGGD-1.016 GL-97-02, GL-97-2, JMHLTR:#98-0164, JMHLTR:#98-164, NUDOCS 9806150270
Download: ML20248M302 (11)

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C. commonwealth litison G)mpany

• Dresden Generating $tation

. M00 North Dresden Road Morris.11. 60h0 Tel 815-9 42-2920 June 12,1998 JMHLTR: #98-0164 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC '9555

Subject:

Monthly Operating Data Repon for May 1998 Dresden Nuclear Power Station Commonwealth Edison Cornpany Dociet Nos.50-010,50-237, and 50-249 Enclosed is the Dresden Nuclear Power Station Monthly Operating Summary Report for May 1998.

This information is supplied to your ofIice as required by Technical Specification 6.9. A.5, in accordance with the instructions set forth in Regulatory Guide 1.16. and Generic Letter 97-02.

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Sincerely, 7

J J. e :l b

Vice Presi ent #

j resden Statio l I

Enclosure cc: NRC Region 111 Oflice Illinois Dept. of Nuclear Safety, State ofIllinois NRC Senior Resident Inspector, Dresden Station UDI, Inc. - Washington, DC l File / Numerical l l

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MONTHLY NRC

SUMMARY

OF OPERATING EXPERIENCE, PER REGULATORY GUIDE 1.16 FOR DRESDEN NUCLEAR POWER STATION COMMONWEALTH EDISON COMPANY FOR MAY 1998 UNIT DOCKET LICENSE 1 .050-010 DPR-2 2 050-237 DPR-19 3 050-249 DPR-25 l 1. ' 83t.0\ 8 301 \ mise \ 98 \ 98060501.GA 1

9 TABLE OF CONTENTS MAY 1998 NRC REPORT 3

1' . 0 Introduction 2.0 Summary of Operating Experience 2.1 Unit 2 Monthly Operating Experience Summary.

2.2 Unit 3 Monthly Operating Experience Summary.

- 3.0 Operating Data Statistics 3.1 Operating Data Report - Dresden Unit 2 3.2 Operating Data Report - Dresden Unit 3 3.3 Unit 2 Shutdowns 3.4 Unit 3 Shutdowns 4.0 Unique Reporting Requirements

!4.1 Main = Steam ~ Relief and/or Safety Valve Operations --

-Unit 2 and Unit 3 4.2 Technical Specification Amendments f

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. l l.0 Introduction i Dresden Nuclear Power Station is a three reactor generating facility owned and operated by the Comed Company of Chicago, Illinois. Dresden Station is located at the confluence of the Kankakee and Des Plaines Rivers, in Grundy County, near Morris, Illinois.

Dresden Unit 1 is a General Electric Boiling Weter Reactor with a design net electrical output rating of 200 megawatts electrical (MWe). The unit is being decommissioned with all nuclear fuel removed from the reactor vessel. Therefore, no Unit 1 operating data is provided in this report.

Dresden Units 2 and 3 are General Electric Boiling Water Reactors; each licensed at 2527 megawatts thermal. The gross outputs of Units 2 and 3 are 832 and 834 megawatts electrical, respectively, with design net electrical output ratings of 794 MWe each. The commercial service date for Unit 2 is 11 August 1970, and 30 October 1971 for Unit 3.

Waste heat is rejected to a man-made cooling lake using the Kankakee River for make-up and the Illinois River for blowdown.

The Architect-Engineer for Dresden Units 2 and 3 was Sargent and Lundy of Chicago, Illinois.

Gary A. Abrell of Dresden Regulatory Assurance Staff compiled this report for MAY 1998, telephone number (815) 942-2920, extension 3749.

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2.0

SUMMARY

OF OPERATING EXPERIENCE FOR MAY 1998 2.1 UNIT 2 MONTHLY OPERATING EXPERIENCE

SUMMARY

Unit 2 operated throughout the period full power except for brief periods for minor maintenance and surveillance testing.

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2.0

SUMMARY

OF OPERATING EXPERIENCE FOR MAY 1998 2.2 UNIT 3 MONTHLY OPERATING EXPERIENCE

SUMMARY

Unit 3 began the period at full power in preparation for a unit shutdown to replace the main power transformer. The unit was taken off line at 1031 on May 2, 1998, and the reactor was shutdown at 1130 that day. Following replacement of the Main Power Transformer and the Unit Auxiliary Transformer, the unit startup began at 0240 on May 15, 1998. The reactor was critical at 0546 that day. The unit was synchronized at 0552 on May 16, 1998.

At 2252 on May 16, 1998, the reactor was manually scrammed as the result of high condensate temperature and condenser low vacuum. The investigation revealed that the number 3 cross around relief valve associated with the Turbine had failed open. Following inspection and repair to this and another cross around relief valve, the unit was restarted at 0941 on May 20, 1998. The reactor was critical at 1350 May 20, 1998 and was synchronized to the system at 1217 on May 21, 1998. The unit began power ascension.

On May 25, 1998, the automatic bus transfer mechanism for transformer cooling fans failed causing a loss of transformer cooling. The Turbine was tripped at 1730 and remained off line until 2358 on May 26, 1998. The unit was limited to about 90% power by condenser backpressure.

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I 3.0 OPERATING DATA STATISTICS 3.1 OPERATING DATA REPORT - DRESDEN UNIT TWO l- DOCKET No. 050-237 DATE June,-1998 COMPLETED BY G. A. ABRELL TELEPHONE (815) 942-2920 OPERATING STATUS

1. REPORTING PERIOD: MAY 1998

2. CURRENTLY AUTHORIZED POWER LEVEL (MWth) : 2,527 MAXIMUM DEPENDABLE CAPACITY (MWe NET) : 772 DESIGN ELECTRICAL RATING (MWe Net): 794

[- 3. POWER LEVEL TO WHICH RESTRICTED (MWe Net) : No restrictions

4. REASONS FOR RESTRICTIONS (IF ANY) : See Section 2.1 of this report.

[ REPORTING PERIOD DATA l PARAMETER TMS MONTH YEAR TO DATE CUMULATIVE i 5 HOURS IN PERIOD 744 3,623 243,719 6 TIME REACTOR CRITICAL 744 2,518 177,526 i 7 TIME REACTOR RESERVE SIIUTDOWN (Hours) 0 0 0 i 8 TIME GENERATOR ON-LINE (Hours) 744 2,441 169,195 i 9 TIME GENERATOR RESERVE SHUTDOWN (Hours) 0 3 4

.i 10 THERMAL ENERGY GENERATED (MNHt Gross) 1,843,715 5,686,869 355,450,292 i 11 ELEC1RICAL ENERGY GENERATED QGEEHe Gross) 598,447 1,847,177 113,581,012 12 ELECTRICAL ENERGY GENERATED (MNEHe Net) 572,847 1,758,869 107,439,044 13 REACTOR SERVICE FACTOR (%) 100.0% 6a.5% 72.8%

> 14 REACTOR AVAILABILITY FACTOR (%) 100.0% 69.5% 72.8%

i 15 GENERATOR SERVICE FACTOR (%) 100.0% 67.4% 69.4%

{ 16 GENERATOR AVAILABILITY FACTOR (%) 100.0% 67.5% 69.4%

17 CAPACITY FACTOR (Using MCD Net) (%) 99.7% 62.9% 57.1%

18 CAPACITY FACTOR (Using DER Net) (%) 97.0% 61.1% 55.5%

i 19 FORCED OUTAGE FACTOR (%) 0% C.9% 12.7%

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3.0 OPERATING DATA STATISTICS 3.2 OPERATING DATA REPORT - DRESDEN UNIT THREE DOCKET No. 050-249 DATE June 4,1998 COMPLETED BY G. A. ABRELL TELEPHONE (815) 942-2920 OPERATING STATUS

1. REPORTING PERIOD: MAY 1998

2. CURRENTLY AUTHORIZED POWER LEVEL (MWth) : ? 527 MAXIMUM DEPENDABLE CAPACITY (MWe Net) : 773 DESIGN ELECTRICAL RATING (MWe Net) : 794

3. POWER LEVEL TO WHICH RESTRICTED: No restriction

4. REASONS FOR RESTRICTIONS (IF ANY): See Section 2.2 of this report.

REPORTING PERIOD DATA  !

PARAM ETER THIS MONTH YFAR TO DATE CUMULATIVE HOURS IN PERIOD 744 3,623 233,I33 TIME REACEOR CRITICAL 351 3,117 165,058 TIME REACTOR' RESERVE SHUTDOWN (Hours) O. 0 0 TIME GENERATOR ON-LINE (Hours) 276 3,020 157,444 TIME GENERATOR RESERVE SHUTDOWN (Hours) 1 1 1 THERMAL ENERGY GENERATED (MWHt Gross) 558,921 7,242,464 330,447,437 ELECTRICAL ENERGY GENERATED (MWEHe Gross) 165,891 2,352,196 105,840,355 ELECTRICAL ENERGY GENERATED (MWEHe Net) 155,180 2,258,691 100,365,608 REACTOR SERVICE FACTOR (%) 47.1% 86.0% 70.8%

REACTOR AVAILABILITY FACTOR (%) 47.1% 86.0% 70.8%

GENERATOR SERVICE FACTOR (%) 37.1% 83.4% 67.6%

GENERATOR AVAILABILITY FACTOR (%) 37.2% 83.4% 67.6%

CAPACITY FACTOR (Using MCD Net) (%) 27.0% 80.8% 55.8%

CAPACITY FACTOR (Using DER Net) (%) 26.3% 78.5% 54.2%

FORCED OUTAGE FACTOR (%) :33.2% 8.3% 14.3%

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3.3 UNIT 2 SHUTDOWNS REPORT MONTH OF MAY 1998 NO DATE TYPE DURATION REASONt2) METHOD CUhkECTIVE (1) (HOURS)* OF ACION3/

CHUTTING C'HMENTS DOWN kEACTOR (3)

Year-to-date forced outage hours = 181 Cumulative forced outage hours = 24,609 TABLE KEY:

(1) (3)

F: Forced Method:

S: Scheduled 1. Manual

2. Manual Scram (2) Reason: 3. Automatic Scram A Equipment Failure (Explain) 4. Other (Explain)

B Maintenance or Test 5. Load Reduction )

C Refueling D Regulatory Restriction )

I E Operator Training &

Licensing Exam F Administrative G Operational Error H Other (Explain) i I

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3.4 UNIT 3 SHUTDOWNS REPORT MONTH MAY 1998 HO DATE TYPE (1) [URATION REAGON(2) METHOD OF CORRECTIVE (HOURS)* SHtJTTING ACTIONG/

DOWN CtHMENTS REACTOR

{3) 3 980501 S 330 A 1 See 2.2 4 980515 F 106.5 A 2 LER 3-98-04 5 980525 F 30.5 A 5 see 2.2 Year-to-date forced outage hours = 272 Cumulative forced outage hours = 26,212 TABLE KEY:

(1) (3)

F: Forced Method:

S: Scheduled 1. Manual

2. Manual Scram (2) 3. Automatic Scram Reason: 4. Other (Explain)

A Equipment Failure 5. Load Reduction (Explain)

B Maintenance or Test C Refueling D Regulatory Restriction E Operator Training &

Licensing Exam F Administrative G Operational Error H Other (Explain) 1 L: 8360\0301\ misc \99\98060501.GA 9 w___________- -. - _ _ . . _ _ .

4.O UNIQUE REPORTING REQUIREMENTS l 4.1 MAIN STEAM RELIEF'AND/OR SAFETY VALVE OPERATIONS -

UNIT 2.

None 4.2 Technical Specification Amendments None J

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