ML20195D000

Monthly Operating Rept for Oct 1998 for Davis-Besse Nuclear Power Station,Unit 1.With

ML20195D000
Person / Time
Site:	Davis Besse
Issue date:	10/31/1998
From:	Lash J, Matranga E CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CCN:P-6-98-10, NUDOCS 9811170269
Download: ML20195D000 (3)

Text

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Davis-Besse Nuclear Power Station j

yn 5501 North State Route 2

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Oak Harbor. Ohio 43449-9760 m

November 13,1998.

CCN: P-6-98-10 i

Document Control Desk U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 Ladies and Gentlemen:

Monthly Operating Report, October 1998 Davis-Besse Nuclear Power Station Unit 1 Enclosed is a copy of the Monthly Operating Report for the Davis-Besse Nuclear Power Station for the month of Oeober 1998.

If you have any questions, please contact E. C. Matranga at (419) 321-8369.

l Very truly yours,

~ju s H. Lash Plant Manager Davis-Besse Nuclear Power Station ECM/ljk l

Enclosure p

cc:

. J. L. Caldwell NRC Region III Acting Administrator A. G. Hansen NRC Project Manager j

S. J. Campbell lh l

NRC Senior Resident Inspector

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OPERATING DATA REPORT DOCKET NO.

50-0346 UNIT NAME Davis-Besse Unit 1 DATE November 9.1998 COMPLETED BY E. C. Matranaa TELEPHONE 419-321-8369 REPORTING PERIOD October.1998 YEAR IQ MONTH DATE CUMULATIVE 1 Design Electrical Rating (MWe-Net).

906 The nominal net electrical output of the unit specified by the utility and used for the purpose of plant design.

2 Maximum Dependable Capacity (MWe-Net).

873 The gross electrical output as measured at the output terminals of the turbine-generator during the most restrictive seasonal conditions minus the normal station service loads.

3 Number of Hours the Reactor Was Cntical.

624.6 5,827.7 120,259.9 The total number of hours during the gross hours of the reporting period that the reactor was critical.

4 Number of Hours the Generator Was On Line.

605.0 5,719.9 117,807.7 (Also called Service Hours). The total number of hours during the gross hours of the reporting period that the unit operated with breakers closed to the station bus.

The sum of the hours the generator was on line plus the total outage hours should equal the gross hours in the reporting period.

5 Unit Reserve Shutdown Hours.

0.0 0.0 5,532.0 The total number of hours during the gross hours of the reporting period ths; the unit was removed from service for economic or similar reasons but was available for i

operation.

6 Net Electrical Energy (MWH).

524,776 4,835,429 95,061,986 The gross electrical output of the unit measured at the output terminals of the turbine-generator minus the normal station service loads during the gross hours of the reporting period, expressed in mega-watt hours. Negative quantities should not be used.

• a UNIT SHUTDOWNS

^

DOCKET NO.'

50-346 k

UNIT NAME Davis-Besse #1 DATE_ November 9,1998 COMPLETED BY E. C. Mau^ ese REPORTING PERIOD: October.1998 TELEPHONE (419) 32't-8369 NO.

DATE TYPE DURATION REASON (1)

METHOD OF -

CAUSE/ CORRECTIVE ACTIONS F: FORCED.

(HOURS)

SHUTTING S: SCHEDULED DOWN (2)

COMMENTS 1998-11 10/14/98 F

A 2

Inadequate human interface design caused the loss of the essential 4160 bus. Improved guidance and additional barriers added. Failed rupture disk caused the CCW leak. A 146.9 modification was initiated for additional overpressure protection.

1998-12 10/18/98 F

F 3

Improper procedure sequence. Procedure was changed.

SUMMARY

Reactor power was maintained at approximately 100% full power for the majority of the month. On October 14,1998, at 1523 hours0.0176 days <br />0.423 hours <br />0.00252 weeks <br />5.795015e-4 months <br />, the reactor was manually tripped from 87% full power due to a Component Cooling Water leak that occurred following a loss and re-energization of an essential 4160 volt electrical bus. Following completion of required maintenance, a reactor startup was commenced and criticality achieved October 18, 1998, at 1636 hours0.0189 days <br />0.454 hours <br />0.00271 weeks <br />6.22498e-4 months <br />. An automatic reactor trip occured at 2152 hours0.0249 days <br />0.598 hours <br />0.00356 weeks <br />8.18836e-4 months <br /> due to mispositioning an Anticipatory Reactor Trip System (ARTS) switch during the startup. Following the completion of corrective action, the reactor was taken critical at 1904 hours0.022 days <br />0.529 hours <br />0.00315 weeks <br />7.24472e-4 months <br /> on October 19,1998. The Main Generator was synchronized to the grid at 1131 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.303455e-4 months <br /> on October 20, and 100% full power was achieved at 2030 hours0.0235 days <br />0.564 hours <br />0.00336 weeks <br />7.72415e-4 months <br /> on October 21.1996 (1) Reason:

(2) Method:

A-Equipment Failure (Explain) 1-Manual '

B-Maintenance or Test 2-Manual Trip / Scram C-Refueling 3-Automatic Trip / Scram D-Regulatory Restriction 4-Continuation E-Operator Training & License Examin 5-Other (Explain)

F-Administrative G-Operational Error (Explain)

H-Other (Explain)

.