ML20107L332

Forwards LAR Re Shutdown Operation of Davis-Besse Nuclear Power Station,Unit 1 During Tenth Refueling Outage

ML20107L332
Person / Time
Site:	Davis Besse
Issue date:	04/18/1996
From:	Stetz J CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20107L333	List: ML20107L332 ML20107L354
References
2374, NUDOCS 9604290276
Download: ML20107L332 (3)

Text

. ,o l l CENTERf0R ENERGY 300 Moseon Annue John P. Seet:

Toledo. OH 43652-0001 Vice President Nucleaf 419 249-2300 m.gesse Docket Number 50-346 License Number NPF-3 l

Serial Number 2374 April 18, 1996 l

l United States Nuclear Regulatory Commission Document Control Desk l_ Washington, D. C. 20555 i

Subject:

License Amendment Request Regarding Shutdown Operation of the Davis-Besse Nuclear Power Station, Facility Operating License Number l NPF-3 Ladies and Gentlemen:

! Toledo Edison is submitting the attached license amendment request for NRC review and approval in accordance with 10CFR50.59(c). This proposed amendment involves the shutdown operation of the Davis-Besse Nuclear Power Station (DBNPS), Unit 1 during the ongoing Tenth Refueling Outage (10RFO).

The DBNPS is currently in a shutdown refueling condition (Mode 6) for the 10RFO. Prior to relying on Emergency Diesel Generator (EDG) No. 1 to support operable Decay Heat Removal (DHR) equipment during the refueling I outage, previously identified EDG start time trends were investigated.

As a result of this investigation, a load imbalance in the generator poles was discovered. Therefore, the generator was shipped offsite to be reworked.

This license amendment proposes that during 10RF0, an alternate electrical lineup be utilized. The Station Blackout Diesel Generator l (SBODG) will be the standby emergency power source available to supply l loads normally supplied by EDG No. 1, if required.

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i 9604290276 960418 PDR P ADOCK 05000346 PDR 4 i

i Operating Companies i Cleveland Electnc illuminating i g Toledo Edson i

Docket Number 50-346

. License Number NPF-3 Serial Number 2374 Page 2 1

i The unavailability of EDG No. 1 will impact outage work scheduled for DHR train No. 2, absent NRC approval of this license amendment request.

Since this would impact the scheduled date of return of the DBNPS to Mode 2, Startup, Toledo Edison requests that the enclosed license amendment application be approved and issued by the NRC as an emergency license amendment in the manner allowed by 10CFR50.91(a)(5), by 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on April 21, 1996. The currently scheduled date of return of the DBNPS to Mode 2 is May 12, 1996.

Should you have any questions or require additional information, please contact Mr. James L Freels, Manager - Regulatory Affairs, at (419) 321-8466.

4 Very truly yours, DHL y sh.+g Enclosure cc: W. L. Axelson, Director, NRC Region III, Division of Reactor )

Projects L. L. Gundrum, DB-1 NRC/NRR Project Manager l Dr. Gail H. Marcus, NRC Project Director  !

H. J. Miller, Regional Administrator, NRC Region III I S. Stasek, DB-1 NRC Senior Resident Inspector J. R. Williams, Chief of Staff, Ohio Emergency Management Agency, State of Ohio (NRC Liaison)

Utility Radiological Safety Board

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, Docket Number 50-346 '

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License Number NPF-3

' Serial Number 2374 Enclosure i Page 2 l

The following information is provided to support issuance of the requested license amendment to the Davis-Besse Nuclear Power Station (DBNPS), Unit j Number 1, Facility Operating License Number NPF-3. This change involves '

shutdown operations of the DBNPS during the ongoing Tenth Refueling Outage (10RFO).

A. Time Required to Implement: This proposed action is to be implemented upon NRC issuance of the License Amendment.

l B. Reason for Change (License Amendment Request Number 96-0005):

l l The DBNPS is currently in a shutdown refueling condition (Mode 6) for l the 10RFO. Prior to relying on Emergency Diesel Generator (EDG) No. 1 to support operable Decay Heat Removal (DHR) equipment during the refueling outage, previously identified EDG start time trends were investigated. As a result of this investigation, a load imbalance in the generator poles was discovered. Therefore, the generator was shipped offsite to be reworked.

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! This license amendment proposes that during 10RF0, an alternate electrical lineup be utilized. The Station Blackout Diesel Generator (SBODG) will be the standby emergency power source available to supply l loads normally supplied by EDG No. 1, if required.

The unavailability of EDG No. 1 will impact outage work scheduled for DHR train No. 2, absent NRC approval of this license amendment request.

l Since this would impact the scheduled date of return of the DBNPS to l Mode 2, Startup, Toledo Edison requests that the enclosed license amendment application be approved and issued by the NRC as an emergency license amendment in the manner allowed by 10CFR50.91(a)(5), by 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on April 21, 1996. The currently scheduled date of return of the DBNPS to Mode 2 is May 12, 1996.

C. Safety Assessment and Significant Hazards Consideration: See Attachment 1.

D. Environmental Assessment: See Attachment 2.

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