ML20248D821

Forwards Safety Evaluation Accepting Util 890228 & 0630 Proposed plant-specific Designs to Comply w/10CFR50.62 ATWS Rule Requirements.Proposed Date of May 1990 for Implementing ATWS Mods Also Acceptable

ML20248D821
Person / Time
Site:	Davis Besse
Issue date:	09/29/1989
From:	Wambach T Office of Nuclear Reactor Regulation
To:	Shelton D TOLEDO EDISON CO.
Shared Package
ML20248D825	List: ML20248D821 ML20248D827
References
TAC-59086, NUDOCS 8910040414
Download: ML20248D821 (3)

Text

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S:ptember 29, 1989 L

Docket No. 50-346 , DISTRIBUTION l x Docket t He '

NRC & Local PDR's  !

PDIII-3 r/f OGC  !

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$Newberry w/o encl MVirgilio w/o enci EJordan PKreutzer  !

DLynch TWambach {

i_ ACRS(10) Region III l l \'

l Mr. Donald C. Shelton l

Vice President - Nuclear loledo Edison Company  !

Edison Plaza - Stop 712 ,

300 Madison Avenue  !

Toledo, Ohio 43652 l l

Dear Mr. Shelton:

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SUBJECT:

EVALUATION OF THE DAVIS-BESSE NUCLEAR POWER STATION COMPLIANCE WITH 10 CFR 50.62 REQUIREMENTS FOR REDUCTION OF RISK FROM ANTICIPATED TRANSIENTS WITHOUT SCRAM (ATWS) (TAC 59086)  !

The NRC staff has completed its review of your submittals dated February 28,  !

1989, and June 30, 1989, osed plant-specific designs to comply with theinreonirements which you presented of 10 CFR your 50.62prop (The ATWS Rule) for the Davis-Besse Nuclear Power Jtation. As discussed in the enclosed safety evaluation, the staff concludes that your proposed designs are in compliance with the ATWS Rule and are therefore, acceptable.

The ATWS Rule requires in Section 50.62 (c)(1) of CFR 50.62 that the equipment i required to automatically initiate the auxiliary (i.e., emergency) feedwater  ;

system and initiate a turbine trip under conditions indicative of an ATWS be j designed to perform its function in a reliable manner. This system, the ATWS l Mitigation System Actuation Circuitry (AMSAC), uses an existing class IE system l which is presently addressed in the Davis-Besse Technical Specifications. On i this basis, we find that your AMSAC meets this criterion.

In a similar fashion, Section 50.62(c)(2) of 10 CFR 50.62 requires that the j diverse scram system (DSS) must also be desigred to perform its function in a reliable manner. The staff finds that the DSS at Davis-Besse is acceptable.

However, there are presently no applicable technical specifications for this non-class IE system. The staff is presently evaluating the need for technical ,

specifications governing operability and surveillance requirements for the DSS and will provide guidance regarding this matter at a later date. In the interim, we recorrnend that you include appropriate surveillance requirements for the Davis-Besse DSS in your plant operating procedures.

We find that your proposed date of May 1990 for implementing the ATWS modifi-  ;

cations is acceptable in acc.ordance with 10 CFR 50.62(d).

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,' .- Mr.' Donald C.:SheltonL ,

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, , Thisicompletes. the staff's review off:your submittal. regarding _ compliance-with'10 CFR 50.62.

Sincerely, I L p 4

/s/

'y Thomas Vi Wambach, Sr. Project Manager '

Project Directorate _III-3' Division of Reactor, Projects - III,

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- IV,: V and Special Projects' .

Office of Nuclear Reactor.. Regulation:

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Enclosures:

L,"' Safety Evaluation cc: See nextlpage l::J'-

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. DOCUMENT NAME: ' TAC 59086 Office: LA/PD II-3 , SPE/PDIII PM/PDIII-3

[ PD DkII-3 r- MDLynch TWambach/mw 1H Surname:

.Date:. _ q /j 89 f M /89 f/Jf/89 hannonQ[89 u __ _ __ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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'.6 Mr.. Donald C. Shelton Davis-Besse Nuclear. Power Station

-Toledo Edison Company Unit No. I cc:

David E. Burke, Esq.

-The Cleveland Electric Radiological Health Program Illuminating Company Ohio Department of Health

'P. O. Box 5000 1224 Kinnear Road Cleveland, Ohio 44101 Columbus, Ohio 43212 Mr. Robert W. Schrauder Attorney General Manager, Nuclear Licensing Department of Attorney Toledo Edison Company General

. Edison Plaza 30 East Broad Street 300 Madison Avenue Columbus, Ohio 43215 Toledo, Ohio 43652 Mr. James W. Harris, Director Gerald Charnoff, Esq. (AddresseeOnly)

Shaw, Pittman, Potts Division of Power Generation and Trowbridge Ohio Department of Industrial Relations 2300 N Street N.W. 2323 West 5th Avenue Washington, D.C. 20037 P. O. Box 825 Columbus, Ohio 43216 Regional Administrator, Region III U.S. Nuclear Regulatory Commission Ohio Environmental Protection Agency 799 Roosevelt Road 361 East Broad Street Glen Ellyn, Illinois Columbus, Ohio 43266-0558 President, Board of Mr. Robert B. Borsum County Commissioners of Babcock & Wilcox Ottawa County Nuclear Power Generation Division Port Clinton, Ohio 43452 Suite 525, 1700 Rockville Pike Rockville, Maryland 20852 State of Ohio Public Utilities Commission Resicent Inspector 180 East Broad Street U.S. Nuclear Regulatory Comission Columbus, Ohio 43266-0573 5503 N. State Route 2 Oak Harbor, Ohio 43449

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