ML20203N792

Forwards Safety Evaluation Accepting Proposed Mods to Safety Features Actuation Sys as Result of 801205 Actuation, Pending Successful Completion of post-mod Tests

ML20203N792
Person / Time
Site:	Davis Besse
Issue date:	04/17/1986
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Williams J TOLEDO EDISON CO.
Shared Package
ML20203N793	List: ML20203N792 ML20203N914
References
TAC-43253, NUDOCS 8605060059
Download: ML20203N792 (2)

Text

_ _ . - _ _ _ _ _ _ _ _ _ _ _ _

'3

+ -

April 170 1986 d'M -- C'/ b '

~

J. ~-

,- ' Docket No. 50-346 Mr. Joe Williams, Jr.

Senior Vice President, Nuclear '

Toledo Edison Company Edison' Plaza - Stop 712 300 Madison. Avenue Toledo, Ohio '43652

SUBJECT:

SAFETY FEATURES ACTUATION SYSTEM - SHARED POWER SUPPLY RETURNS On December 5,1980, an inadvertent Safety Features Actuation System (SFAS) actuation occurred at the Davis Besse Nuclear Power Station. Subsequent investigation of the circumstances leading to this event revealed that there were interconnections of the redundant channels via shared power supply returns. Since then, there has been an ongoing review of the acceptability of these hardwired interconnections with respect to the original basis upon which the plant was licensed and with respect to meeting IEEE Standard 279.

Toledo Edison has now proposed specific modifications to the SFAS to resolve this issue. The staff has reviewed the proposed modifications and has concluded that they are acceptable pending successful completion of post modification tests. These tests are discussed in the attached Safety Evaluation Report.

Sincerely, a

m iu 1.u L s1 GUED a g JCEE 7. SP g 4 John'F."Stolz, Director PWR Project Directorate #6 Division of PWR Licensing-B

Enclosure:

Safety Evaluation cc w/ enclosure:

See next page DlSIRIHILTI0!( ACRS-10 GDick GEdison

{NRC-P0kDocket FiTB BGrimes JPartlow WPaulson L PDR ADeAgazio PBD-6 Rdg RIngram FMiraglia Gray File OELD EBrach p EJordan H0rnstein PBD-6hs PB -6 * - PBN ADeAgazio;jak CMcCracken JSto q 4/gg86 4//p/86 4// 86

!PJ'n?R*ETag6 S

. Mr. J. Williams Davis-Besse Nuclear Power Station Toledo Edison Company Unit No. 1 CC:

Donald H. Hauser, Esq. Ohio Department of Health The Cleveland Electric ATTN: Radiological Health Illuminating Company Program Director P. O. Box 5000 P. O. Box 118 Cleveland, Ohio 44101 Columbus, Ohio 43216 Mr. Robert F. Peters 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 1800 M Street, N.W. 2323 West 5th Avenue Washington, D.C. 20036 P. O. Box 825 Columbus, Ohio 43216 Mr. Paul M. Smart, President Mr. Harold Kohn, Staff Scientist The Toledo Edison Company Power Siting Commission 300 Madison Avenue 361 East Broad Street Toledo, Ohio 43652 Columbus, Ohio 43216 Mr. Robert B. Borsum President, Board of Babcock & Wilcox County Commissioners of Nuclear Power Generation Ottawa County Division Port Clinton, Ohio 43452 Suite 200, 7910 Woodmont Avenue Bethesda, Maryland 20814 Resident Inspector U.S. Nuclear Regulatory Commission 5503 N. State Route 2 Oak Harbor, Ohio 43449 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 mr------ v- -,- -- --, ,~ y q . - , - - m-. - . . - ,