ML19319B921

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Notifies of Incomplete & Unacceptable Areas of Responses on Routing of Class 1E Wiring & non-class 1E Wiring within Class 1E Logic Cabinets & Panels,To Be Discussed at 770317 Meeting
ML19319B921
Person / Time
Site: Davis Besse 
Issue date: 03/17/1977
From: Stolz J
Office of Nuclear Reactor Regulation
To: Roe L
TOLEDO EDISON CO.
References
NUDOCS 8001290656
Download: ML19319B921 (3)
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Toledo Edison Company HSaith ATTN: Mr. Lowell E. Roe bec: JRBuchanan, NSIC i

Vice President, Facilities TBAbernathy, TIC Development Edison Plaza 300 Madison Avenue Toledo, Ohio 43652 Gentlemen:

SUBJECT:

ROUTING OF CLASS lE WIRING WITH NON-CLASS lE WIRING WITHIN CLASS lE LOGIC CABINETS AND PANELS We stated in Section 7.9.3 of the Safety Evaluation Report for Davis Besse, Unit 1 (03-1) that the separation criteria did not include separation requiroments between Class lE and non-Class lE wiring inside the Class lE logic cabinets.

You were requested to verify that faults (i.e., grounding, shorting, application of high voltage, or electromagnetic interference (noise))

on non-Class lE circuits would not propagate to the safety grade cir-cuits and degrade them below an acceptable level. Subsequently, you agreed to submit test procedures and test results which would demon-strate that such faults would not degrade the safety systems below an acceptable level.

In response to our concern, you submitted tests in December,1976 which described various qualification procedures conducted by the Class lE safety systems suppliers (i.e., the Reactor Protection System supplier and the Engineered Safety Features Actuation System supplier). Although i

j these qualification procedures described the methodology used (via analysis and/or test) to qualify several isolation devices, and demon-j strate that certain selected pieces of equipment on a component or subchannel level were immune to simulated electromagnetic interference (noise), the information and tests presented did not adequately demon-strate that faults (such as described above) would not degrade the -

t safety systens (as implemented and wired at the plant site) below an j

acceptable level. Therefore, we found your response to our concerns MY l

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NRC Form 318 (2 76) NRCM 02040 it v.s. so V ERNMEN T P RIN TING OF Ff C E: 19 76 =4 3 4 = 7 0 2 soontos5ifA ua a.~

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regarding the adequacy af the implemented design (i.e., non-separation

-of Class lE and non-Class lE wiring inside the Class lE logic cabinets and associated panels) to be incomplete and unacceptable.

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As you know, in various comunications we requested that you reevaluate i

the design and provide the infomation identified in Paragraph II of this letter. In addition, we indicated to you that an acceptable demonstration of your design should be provided and include:

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Provide definition of the maximum credible voltage, current and I

electromagnetic disturbance that could be imposed in these circuits, i

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Define fault duration and a description of the fault detection or fault termination devices used to limit faulted conditions (include primary and back-up devices, if any),

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A_ description of the adequacy of the cable wiring and/or connectors

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required to sustain.the above faulted conditions without degradation, or which could. lead to' degradation or faulted conditions in the safety channels, and AD -

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Provide test procedures and test results which demonstrate that i

faults identified in the previous three items would not degrade the installed. safety: systems below acceptable levels.

As you know, the staff will be meeting with you, the Consumers Power j

-Company, and the appropriate contractor agents on March 17, 1977, to t

-. discuss these matters (as, identified above).

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hesitate to call u(s at any' time if you deem it necessary to j

, Do not further oefinition of our concerns.

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~ btain It is our desire to obtain

.o resolution on.the tests and infonnation required in order that.we may

. identify these matters as. resolved in our forthcoming Supplement 1 to the. Safety. Evaluation l Report for DB-1 7 =

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NAR 171977-1 Toledo Edison Company

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Cleveland Electric Illuninating i

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P. O. Box 5000 l

Cleveland, Ohio 44101 i

Gerald Charnoff, Esquire l

Shaw, Pittman, Potts and Trowbridge 1800 M Street N. W.

Washington, D. C.

20036 Leslie Henry, Esquire

Fuller, Seney, Henry and Hodge 300 Madison Avenue Toledo, Ohio 43604

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