ML20012F600

Submits Supplemental Response to Station Blackout Issues,Per NUMARC 900104 Request.Util Revises Schedule for Compliance W/Station Blackout Rule (10CFR50.63) to within 2 Yrs of SER Issuance Date

ML20012F600
Person / Time
Site:	Davis Besse
Issue date:	04/02/1990
From:	Shelton D TOLEDO EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1786, NUDOCS 9004160265
Download: ML20012F600 (2)

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l DONALD C. SHELTON i vu snows., ma.w vm so nx Docket Number 50-346 ,

d License Number NPT-3 j Serial Number 1786 i

April 2, 1990 ,

l United States Nuclear Regulatory Commission Document Contrel Desk vashington, D. C. 70555 Subject Supplemental Station Blackout (SBO) Response for Davis-Besse i Toledo Edison Company was requested by the Nuclear Management and Resources ,

Council (NUMARC), by a letter dated January 4, 1990, to review its previous 1 SB0 response to the NRC and provide a response to the NRC confirming that the guidance of NUMARC 87-00 vas folloved. Specifically, utilities vere requested to verify that implementation is consistent vith the supplemental guidance provided by the attachments to the NUMARC letter, that applicability of NUMARC 87-00 assumptions is documented in utility files, and that departures from the accepted NUMARC 87-00 methodology are identified.

Toledo Edison's response to the Station Blackout rule was semitted on April 17, 1989 (Serial Number 1651). NUMARC 87-00 guidelines ven ased in '

evaluating Davis-Besse design features against SB0 rule ri wirements except vhere Regulatory Guide 1.155 took precedence. NUMARC 87-W, Section 3 i guidelines vere used to determine that the required coping duration for Davis-Besse is four hours. In the April 17, 1989 response, Toledo Edison i committed to install an alternate AC (AAC) power source with adequate capacity l to power all systems required to cope with SB0 and with the capability of being available within ten minutes of the onset of SB0. TE committed to meet .'

the criteria specified in Appendix B to NUMARC 87-00 for AAC power supplies. l A diesel Eenerator target reliability of 0.95, selected using NUMARC guidance,  !

vill be maintained at Davis-Besse. Since TE opted to provide an AAC pover 1

supply vith capability of remote operation from the Control Room, no coping  ;

assessment was required. l Toledo Edison's commitment to meet the SB0 rule by the end of the 7th Refueling OutaEe vas based on the NRC issuing a Safety Evaluation Report (SER) i p

I 65 9o0402 h[CKc5000346 PDC .

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TOLEDO, OHIO 43652 (s ,

0 THE TOLEDO EDISON COMPT.NY EDtSON PLAZA 300 MAO! SON AVENUE l l

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'$ocket Number 50-346

.Li;emse Number NPP '

,$6 rial Number 1786 Page 2 L vithin 3 monthe of our April 17, 1989 subalttal, vhich would have made' compliance required by August, 1991 (two years from the date of SER issuance).

Toledo Edison hereby revises its schedule for $D0 compliance to be within two years of.the SER issuance date in accordance with 10CPR$0.63.

Should you have any questions, please contact Mr. R. V. Schrauder, Manager -

~ Nuclear Licensing, at (419) 249 2366.

Very truly yours,

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EBS/ssg f:

I cci P. M. Byron, DB-1 NRC Senior Resident inspector i

A. B. Davis, Regional Administrator, NRC Region 113 T. V. Vambach, DB-1 NRC Senior Project- Manager e

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