ML043240118

October 2004 Monthly Operating Report for Dresden Nuclear Power Station Units 2 and 3

ML043240118
Person / Time
Site:	Dresden
Issue date:	11/12/2004
From:	Bost D Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
SVLTR# 04-0073
Download: ML043240118 (7)

Text

Exelon Generation Company, LLC www.exeloncorp.com Exelkn(

Dresden Nuclear Power Station Nuclear 6500 North Dresden Road Morris, IL 60450-9765 November 12, 2004 SVPLTR # 04-0073 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Dresden Nuclear Power Station, Units 2 and 3 Facility Operating License Nos. DPR-19 and DPR-25 NRC Docket Nos. 50-237 and 50-249

Subject:

Monthly Operating Report for October 2004 In accordance with Technical Specifications, Section 5.6.4, "Monthly Operating Reports," we are submitting the October 2004 Monthly Operating Report for Dresden Nuclear Power Station (DNPS), Units 2 and 3.

Should you have any questions concerning this letter, please contact Mr. Pedro Salas, Regulatory Assurance Manager, at (815) 416 - 2800.

Respectfully, Dan . Bost Site Vice President Dresden Nuclear Power Station Attachment cc: Regional Administrator- NRC Region IlIl NRC Senior Resident Inspector - Dresden Nuclear Power Station

ATTACHMENT DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 MONTHLY OPERATING REPORT FOR OCTOBER 2004 EXELON GENERATION COMPANY, LLC FACILITY OPERATING LICENSE NOS. DPR-19 AND DPR-25 NRC DOCKET NOS. 50-237 AND 50-249

TABLE OF CONTENTS I. Summary of Operating Experience A. Unit 2 Monthly Operating Experience Summary B. Unit 3 Monthly Operating Experience Summary II. Operating Data Statistics A. Operating Data Report - Dresden Unit 2 B. Operating Data Report - Dresden Unit 3 III Unit Shutdowns A. Unit 2 Shutdowns B. Unit 3 Shutdowns IV. Challenges to Safety and Relief Valves

I.

SUMMARY

OF OPERATING EXPERIENCE FOR OCTOBER - 2004 A. UNIT 2 MONTHLY OPERATING EXPERIENCE

SUMMARY

On October 2, at approximately 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />, the unit was taken offline to balance the main generator rotor to reduce high bearing vibration. However, the reactor remained at power during this time. The unit returned online at approximately 1400, and achieved full power operation at approximately 1000 on October 3.

On October 9, at approximately 0000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />, load was reduced to approximately 89%

electrical output to perform a control rod pattern adjustment. The unit returned to full power operation at approximately 0500.

On October 28, at approximately 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br />, load was reduced to approximately 83%

electrical output due to high turbine generator bearing vibration. The unit remained at this power level for the remainder of the month.

With the exception of short periods for routine maintenance, surveillances and the above occurrences, Unit 2 operated at full power throughout the remainder of the reporting period.

B. UNIT 3 MONTHLY OPERATING EXPERIENCE

SUMMARY

On October 3, at approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />, load was reduced to approximately 34%

electrical output to perform a control rod pattern adjustment and main generator rotor thermal sensitivity testing. The unit returned to full power operation at approximately 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on October 6.

On October 17, at approximately 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br />, load was reduced to approximately 86%

electrical output to perform a control rod pattern adjustment. The unit returned to full power operation at approximately 1000.

On October 26, at approximately 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br />, the unit was taken offline to perform a scheduled refueling outage. It remained offline for the remainder of the month.

With the exception of short periods for routine maintenance, surveillances and the above occurrences, Unit 3 operated at full power throughout the remainder of the reporting period.

II. OPERATING DATA STATISTICS A. Dresden Unit 2 Operating Data Report for October 2004 DOCKET NO. 050-237 DATE November 1,2004 COMPLETED BY Joseph Reda TELEPHONE (815) 416-3081 OPERATING STATUS

1. REPORTING PERIOD: October 2004

2. CURRENTLY AUTHORIZED POWER LEVEL (MWth): 2,957 MAXIMUM DEPENDABLE CAPACITY (MWe NET): 850 (estimated)

DESIGN ELECTRICAL RATING (MWe Net): 867 Unit 2 Monthlv Oneratinfr Status This Year to Cumulative Month Date

3. Reactor Critical - Hours 745 6,740 231,216

4. Hours Generator On-Line 733 6,573 222,481

5. Unit Reserve Shutdown - Hours 0 0 4

6. Net Electrical Energy Generated -

MWHe 616,857 5,510,072 150,223,333

ii II. OPERATING DATA STATISTICS B. Dresden Uinit 3 Operating Data Report for October 2004 DOCKET NO. 050-249 DATE November 1, 2004 COMPLETED BY Joseph Reda TELEPHONE (815) 416-3081 OPERATING STATUS

1. REPORTING PERIOD: October 2004

2. CURRENTLY AUTHORIZED POWER LEVEL (MWth): 2,957 MAXIMUM DEPENDABLE CAPACITY (MWe NET): 850 (estimated)

DESIGN ELECTRICAL RATING (MWe Net): 867 Unit 3 Monthly Operating Status This Year to Cumulative Month Date

3. Reactor Critical - Hours 611 7,019 218,347

4. Hours Generator On-Line 606 6,958 210,240

5. Unit Reserve Shutdown - Hours 0 0 1

6. Net Electrical Energy Generated -

MWHe 513,513 5,974,735 142,301,996

- I III. UNIT SHUTDOWNS A. Unit 2 Shutdowns for October 2004 O DATE TYPDURATIO REASON (2) METHOD OF CORRECTIVE ACTIONS/

E N SHUTTING COMMENTS (1) (HOURS) DOWN REACTOR (3) 5 10/02/0 F 12 A 5 Unit was taken offline to balance 4 (Balance of main (Unit was taken the main generator rotor to reduce generator rotor) off line but high bearing vibration. However, reactor was the reactor was maintained at maintained at power during the outage.

power)

B. Unit 3 Shutdowns for October 2004 NO DATE TYP DURATIO REASON (2) METHOD OF CORRECTIVE ACTIONS/

E N SHUTTING COMMENTS (1) (HOURS) DOWN REACTOR (3) 4 10/26/0 S 139 C 1 This is a normally scheduled 4 (October refueling outage.

alone)

LEGEND:

(1) Tvpe: (2) Reason (3) Method F - Forced A. Equipment Failure (Explain) 1. Manual S - Scheduled B. Maintenance or Test 2. Manual Trip / Scram C. Refueling 3. Automatic Trip / Scram D. Regulatory Restriction 4. Continuation E. OperatorTraining & Ucensing Exam S. Other(Explain)

F. Administrative G. Operational Error (Explain)

H. Other (Explain)

IV. CHALLENGES TO SAFETY AND RELIEF VALVES Unit 2 None Unit 3 None