ML20247F339

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

ML20247F339
Person / Time
Site:	Dresden
Issue date:	04/30/1998
From:	Abrell G, Heffley J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-97-02, GL-97-2, JMHLTR:#98-0138, JMHLTR:#98-138, NUDOCS 9805190291
Download: ML20247F339 (12)

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Commonwealth Edison Company

- Dresden Generating Station 69N) North Dresden Road Morris, !!. 60 MO Tel Hl5-912-2920 May 11,1998 JMHLTR: #98-0138 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Subject:

Monthly Operating Data Report for April 19.98 Dresden Nuclear Power Station Commonwealth Edison Company Docket Nos.50-010, 50-237, and 50-249 Enclosed is the Dresden Nuclear Power Station Monthly Operating Summary Report for April 1998.

This information is supplied to your office 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.

Sincerely, i J h1. He e ite Vice Prei ent Dresden Stati l

Enclosure cc: NRC Region Ill Office Illinois Dept. of Nuclear Safety, State ofIllinois l NRC Senior Resident inspector, Dresden Station UDI, Inc. - Washington, DC File / Numerical-9905190291 990430 PDR ADOCK 05000010 R pon j-[ ,) l-l li u

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MONTHLY NRC  ;

l SU14%RY OF OPERATING EXPERIENCE, PER REGULATORY GUIDE'1.16 FOR DRESDEN NUCLEAR POWER STATION CONNONWEALTH EDISON COMPANY FOR APRIL 1998 UNIT DOCKET LICENSE 1 050-010 DPR-2 2 050-237 DPR-19 3 050-249 DPR-25 ..l; I

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1 TABLE OF CONTENTS APRIL 1998 NRC REPORT 1.0 Introduction 2.0 Summary of Operating Experience 2.1 . Unit 2' Month'ly-operating Experience Summary.

22 -Unit 3' Monthly Operating Experience Summary. j 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 1

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.1.01 Introduction Dresden: Nuclear.. Power Station is a three reactor

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generating' facility owned and' operated by the Comed Company-of Chicago,-Illinois. Dresden Station:is

-located at_the'confluenc'e'of;the Kankakee and Des J

.Plaines Rivers, in.'Grundy County, near, Morris, '

, -Illinois.

Dresden Unit 11 is.a GeneralLElectric Boiling; Water' Reactor.'with awdesign 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 l provided in this report.-

m 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,Lwith design.-

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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

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for blowdown.

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

This report for APRIL 1998,.was compiled by Gary A.

Abrell of Dresden Regulatory Assurance Staff, . telephone number ~(815) 942-2920, extension 3749.

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2.0

SUMMARY

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

SUMMARY

Unit 2 began the period with core reload in progress. Core' reload was completed at 2006 on April 1, 1998. A reactor startup began at 2046 on April 15, 1998, and the reactor was critical at 0117 on April 16, 1998. The unit was placed on system at 1606 on April 17, 1998, ending the refuel outage D2R15. The unit began power ascension and startup testing.

The unit tripped at 0858 on April 20, 1998, by a Generator Load reject signal. The load reject was the result of a design error that occurred during a recent modification to the unit auxiliary transformer. The unit was restarted at 1237 on April 22, 1998 following the root cause investigation and corrective actions. The reactor was critical at 1751 on April 22, 1998, and placed on system at 1429 April 23, 1998. Power ascension and startup testing resumed. The unit reached full power at 2106 on April 27, 1998.

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SUMMARY

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

SUMMARY

Unit 3 began the period near full power. At 1522 on April 8, 1998, a Main Steam Line High Flow Switch failed during surveillance testing and Operators removed the fuse from that channel generating a half Group I isolation signal. At 0040 on April 9, 1998, the reactor tripped when the Main Steam Isolation Valves closed. It was determined that the other Group I circuit opened momentarily as a result of a high resistance relay contact. Following a root cause investigation and corrective actions, the reactor was restarted at 1341 on April 13, 1998. The reactor was critical.

at 1926 on April 13, 1998, and placed on system at 1653 on April 14, 1998.

The unit reached full power at 1630 on April 18, 1998, and remained at that load except for brief '

load reductions for minor maintenance and surveillance tecting.

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

1. REPORTING PERIOD: APRIL 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- l PARAMETER THIS MONTH YEAR TO DATE CUMULATIVE l 5 HOURS IN PERIOD 719 2,879 242,975 6 TIE REACTOR CRITICAL 302 1,774 17b,781 7 TIE REACTOR RESERVE SHUTDOWN (Hours) 0 0 t.

8 TIE GENERATOR ON-LINE (Hours) 242 1,697 168,451 9 TIE GENERATOR RESERVE SHUTDOWN (Hours) 3 3 4 10 THERMAL ENERGY GENERATED DerHt Gross) 431,171 3,843,154 353,606,577 11 ELucTRIcAL zwansy azuzRATED (bSRHe Gross) 133,358 1,248,730 112,982,56t 12 ELECTRICAL ENERGY GENERATED (MNEHe Net) 123,281 1,186,022 10b,866,197 13 REACTOR SERVICE FACTOR (%) 42.O% 61.61 72.8%

14 REACTOR AVAILABILITY FACTOR (%) 42.0% 61.b4 72.84 15 GENERATOR SERVICE FACTOR (%) 33.7% 58.9% 69.34 l 16 GENERATOR AVAILABILITY FACTOR (%) 34.1% 59.0% 69.31 17 CAPACITY FACTOR (Using MCD Net) - (%) 22.2% 53.41 57.0%

18 CAPACITY FACTOR (Using DER Net) (%) 21.6% 51.94 55.44 19 PDRCt.D OUTAGE FACTOR (%) 24% 9.64 12.74

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3.0- OPERATING DATA STATISTICS 3.2 OPERATING DATA REPORT - DRESDEN UNIT THREE I

DOCKET No. 050-249 DATE May 4,1998 i COMPLETED BY G. A. ABRELL TELEPHONE'. (815) 942-2920 l

OPERATING STATUS l

1. REPORTING PERIOD: APRIL 1998

2. CURRENTLY AUTHORIZED POWER LEVEL (MWth): 2,527 MAXIMUM 1 DEPENDABLE CAPACITY (MWe Net): 773 l

DESIGN ELECTRICAL RATING (MWe Net): 794

3. POWER LEVEL TO WHICH RESTRICTED: No restriction i

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

REPORTING PERIOD DATA E PARAMETER THIS MONTH YEAR TO DATE CUMULATIVE HOURS IN PERIOD 719 2,879 232,295  ;

1 T M REACTOR CRITICAL 606 2,766 164,707 TIME REACTOR RESERVE SHUTDOM4 (Hours) 0 -0 0 T M GENERATOR CN-LINE (Hours) 584 2,744 157,168 TM GENERATOR RESERVE SHUTDolet (Hours) 0 0 0 l

THERMAL ENERGY GENERATED (16fHt Gross) 1,383,637 6,683,543 329,888,516 ELECTRICAL ENERGY GENERATED (MNEHe Gross) 452,445 2,186,305 105,674,464 ELECTRICAL ENERGY GENERATED (>54EHe Net) 433,588 2,103,511 100,210, 42 fl REACTOR SERVICE FACTOR (%) 84.3% 96.1% 70.91 REACTOR AVAILABILITY FACTOR (%) 84.3% 96.1% 70.9%

GENERATOR 8ERVICE FACTOR (%) . 81.2% 95.3% 67.74 GENERATOR AVAIIABLILITY FACTOR (%) 81.2% 95.3% 67.7%

CAPACITY FACTOR (Using ICD Net) (%) 78.1% 94.6% 55.9%

CAPACITY FACTOR (Using DER Net) (%) 76.0% 92.01 54.3%

l FORCED OUTAGE FACTOR (%) 18.81 4.71 14.2%

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Y 3.3- UNIT 2 SHUTDOWNS REPORT MONTH OF APRIL'1998 NO DATE TYI'E DURATION REASON (2 METHOD OF. CORRECTIVE (1) (HOURS)* SHUTTING ACTIONS /

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gg- COMMENTS REACTUM ,

(3) 2 980307 S 398 C 1 D2R15 3 980420 F '76 H 3 LER 2-98-008 i

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

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- F:. Forced Method:

- S: Scheduled 1. ' Manual

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

A Equipment Failure (Explain). 5. Load Reduction B' Maintenance or' Test.

C- Refueling D Regillatory Restriction . .)

E Operator Training & j Licensing Exam -j F Administrative G- Operational Error H~ . Other (Explain)

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'3.4 UNIT 3 SHUTDOWNS REPORT MONTH APRIL 1998 NO DATE TY F'E (1 ) DURATION REASON (2) METHOD Of CORRECTIVE (HOURS)* SHUTTING ACTIONS /

DOWN COMMENTS RCACTOR (3) 1 980409 F 135 A 3 LER 3-98-003 Year-to-date forced outage hours = 135 Cumulative forced outage hours = 26,075 q TABLE KEY: I I

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F: Forced Method:

S: Scheduled 1. Manual l

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

A Equipment Failure 5. Load Reduction (Explain)

B Maintenance or Test l C Refueling D Regulatory Restriction E Operator Training & j Licensing Exam l F Administrative l G Operational Error H Other (Explain)

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l 4.0 UNIQUE' REPORTING REQUIREMENTS 4.1- MAIN STEAM RELIEF AND/OR SAFETY VALVE OPERATIONS -

UNIT 2.

Four safety valves were overhauled and lift tested at the station prior to reinstallation on Unit 2. On April 16, 1998 during the testing program following D2R15, Safety relief valves and the Target Rock valve f were manually opened at low pressure in accordance with Dresden Operating Surveillance, DOS 0250-04

" Relief Valve Testing At Low And At High Pressure."

There was no activity on Unit 3 during the period.

4.2 Technical Specification Amendments Amendment 168 was implemented on Unit 2 prior to Mode 2 entry after D2R15. This amendment changes the MCPR Safety Limit for Unit 2 to 1.09 from 1.08 to account for statistical uncertainties in the calculation for MCPR Safety Limit. This is a single cycle amendment as reflected in the Design Feature Section of the Technical Specifications. A permanent amendment is pending approval which removes the single cycle restrictions on Units 2 and 3.

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