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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=Re Docket No. 50-323-OL j

Diablo Canyon Site

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Unita 1 and 2 e{

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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 l

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Philip A. Cranc, Jr.

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'.iI Angelo Giambusso, Nathaniel H. Goodrich, Alan S. Rosenthal, Secretary-Docketing and Service Section, James R. Yore y

6 8705060227 870430 PDR ADOCK 05000498 A

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Febrtary 28,197S PGE-2943 p,

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h.S Mr. D. V. Kelly S.O. PGE-320 Chief Mechanical Engineer Ref.. W Letter PGE-2893 M)

PACIFIC GAS AND ELECTRIC COMPANY 77 Beale Street N

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Dear Mr. Kelly:

PACIFIC GAS AND ELECTP.IC COMPANY 6.Q,.'

NUCLEAR PLANT, DIABLO CANYON SITE M

UNIT NUMBERS 1 AND 2 V,t. -

Supplement to W Systems Noise Test W:

During a meeting at Bethesda, Maryland, on February 6.1975, held with

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PG&E.:.Weand NRC to discuss the resolution of SER open items..the NRC

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electrTcal reviewers concern centered on the effect of 460 VAC faults on the control side of the isolation devices in the as-built Process y'

Control equipment.

(The referenced (PGE-2893) tests reported only 118 VAC and 250 VOC faults.) The NRC maintained that a high probability existed for 460 VAC faults on PCS control circuits because of cable

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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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In planning the scope of the: test programs, 460 VAC faults were not U

considered credible. However, in the PCS test procedures, because of

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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

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engineers did exercise the option and connected 460 VAC to the PCS control c,, t,

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

that:theJprotection side of the isolation devices was imune to this 6%[E -the;referen'c'ed transmittal.

! fault.Y Also included are photographs representative of the PCS test q.

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

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belin3srt'ediin the ' referenced "W Protection Systems Noise Tests" report a

hb.3$[..Ipe%thel.]nstructions atta'ched ti each supplement. We are supplying 35 copies

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