ML19329B096

Final Deficiency Rept Re Use of Seismically Unqualified GE Type Hfa Relay.Relays Retested & Found Qualified

ML19329B096
Person / Time
Site:	Davis Besse
Issue date:	10/27/1976
From:	Roe L TOLEDO EDISON CO.
To:
Shared Package
ML19329B081	List: ML19329B083 ML19329B089 ML19329B094 ML19329B095 ML19329B096 ML19329B097
References
138, NUDOCS 8001300682
Download: ML19329B096 (2)

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LOWELL E. ROE

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. r=.we. o,.eu.m m October 27, 1976 .

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serial No.: 138

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Docket No.: 50-346 . <

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Mr. James G. Keppler -

I Regional Director, Region III ,

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.Directorato of Regulatory Operations U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 m

Dear Mr. Koppler:

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This letter is submitted as a final report in accordance tritli 10 'CFR

• Part 50.55(c) rcgarding the deficiency involving the Ucstinghouse Medium Voltacc, type Dil-P 4,16 KV suitchscar, used on busses C1 and D1, at Davia-Besso Nuclear Power Station Unit No. 1. This was discussed by Mr.

C..R. Domeck, Nuclear Project Engineer, with Mr. T. Vandcl, NRC Region

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III Office of Inspection and Enforcement, on September 24, 1976, and was

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. reported 'as a deficiency. ,

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Description _ of the Deficiency . .

In response to an iuquiry regarding the scismic capability of the appurte- I nances to the subject suitchgear, a Ucstinghouse sales engineer responded l to our agent, Dccht.cl Company, that the Cencral Electric Type HFA relay )

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was not scismically qualified Class IE.

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Corrective Action *

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A joint meeting with'Ucstinghouse, Dechtcl, and Toledo Edison at Pittsburgh revealed that. Ucstinghouse had scismically tested a prototype switchucar

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assembly, and made an analysis of the appurtenances to qualify the l Davis -Besse suitchgear and the components to Class IE, per our specifica-l tionc. The scismic qualification reports were submitted as required by 1

( the specification. The basis for the scisinic qualification was an

(,,,/ analysis of the scucric test, which included relays specifically chosen

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to represent the various available types of movements, and were performed

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at severe seismic icycls well above those for Davis-Hesse. The Type llFA rhlays were not, however, included in the prototype test. Recent infor-

- nation received from the poneral Electric Company has confirmed the seismic qualification of the Type !:FA rela'yc for this application.

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Safety Implications .

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Since no actual equipment deficiency existed, the health and safety of

, the public were not jeopardized. .

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Yours very truly,

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Dr. Ernst Volgenau, Director Office of Inspection & Enforcement N U.S. Nucicar Regulatory Cor:nission *

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Washington, DC 20555

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