ML20210C551

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Forwards Westinghouse Protection Sys Noise Tests in Support of Applications for OLs for Units 1 & 2.Ack of Receipt of Encls Requested.Related Info Encl.W/O Test Rept
ML20210C551
Person / Time
Site: Diablo Canyon, South Texas, 05000000
Issue date: 01/16/1975
From: Crane P
PACIFIC GAS & ELECTRIC CO.
To:
NRC
Shared Package
ML20210C503 List:
References
NUDOCS 8705060227
Download: ML20210C551 (3)
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Diablo Canyon Site :t Unita 1 and 2 e{

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Dear Sir ,

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Enclosed in support of our application for an operating license for Units 1 and 2 at the Diablo Canyon 'l Site are 15 copies of the following report:

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" Westinghouse Protection Systems Noico Tests , " by D. N. Katz , et al., Decem-bor, 1974. -

This report is' referenced in Section 7.2 of the Final Safety Analysis Re ort, as submitted in Amendment 24 to ,

our application. t Kindly acknowledge receipt of the above material on the enclosed copy of this letter and return it to me in the enclosed addressed envelope. l Very truly yourn, p.yt.t c: e.o e n caterial lj

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Philip A. Cranc, Jr. / ' ,

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) tate! ' 3 .j Enclosures CC w/ enc. : All parties, Board members, Richard L. Black, '.iI Angelo Giambusso, Nathaniel H. Goodrich, Alan S. Rosenthal, Secretary-Docketing and Service Section, James R. Yore y

.' 6 8705060227 870430 .

PDR ADOCK 05000498

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S.O. PGE-320 h.S Mr. D. V. Kelly

%' Chief Mechanical Engineer Ref.. W Letter PGE-2893 PACIFIC GAS AND ELECTRIC COMPANY .

M) 77 Beale Street San Francisco, California 94106 N D #-

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Dear Mr. Kelly:

6 PACIFIC GAS AND ELECTP.IC COMPANY

.Q , .' NUCLEAR PLANT, DIABLO CANYON SITE M UNIT NUMBERS 1 AND 2 Supplement to W Systems Noise Test V,t!. -

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';; . ^' During a meeting at Bethesda, Maryland, on February 6.1975, held with PG&E.:.Weand NRC to discuss the resolution of SER open items..the NRC electrTcal reviewers concern centered on the effect of 460 VAC faults

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. on the control side of the isolation devices in the as-built Process Control equipment. (The referenced (PGE-2893) tests reported only 118

.;,. VAC and 250 VOC faults.) The NRC maintained that a high probability

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, existed for 460 VAC faults on PCS control circuits because of cable r routing in the plant. Sinct in the PCS protection racks the input-

!.. output cables are in very close proximity, the NRC felt that the 460 X,. VAC fault shuld have been included in the PCS tests.

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'h . ' In planning the scope of the: test programs, 460 VAC faults were not U considered credible. However, in the PCS test procedures, because of

. ., the"close proximity of the isolator input-output cables in the as-built y L,t equipment,' and because the isolator verification WCAP 7509-L reported h1 on'.the'460 VAC fault, this test was retained as an option at the discre-tion.of the Westinghousa test engineers conducting the site tests. The

" 'S[ engineers did exercise the option and connected 460 VAC to the PCS control c, , t ,

. cables.

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M ,. .The attachments include test data on the PCS 460 VAC faults and confirms M.q. -

that:theJprotection side of the isolation devices was imune to this

! fault.Y Also included are photographs representative of the PCS test arrangements.. These. photos were omitted from the report sent to you via -

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hsing.3 coples of this supplemental information which should N..

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- atta'ched ti each supplement. We are supplying 35 copies
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M. le: Ethatithis's, pplem..~" u ental.infomation resolves the concerns kppNG.Mfh4Nraisidiatithe.NRC.me'eting:of February 6,1975.

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