ML20028D218

Clarifies Position Re Electrical Separation as Defined by IEEE 384-1974 & Reg Guide 1.75,Rev 1.Single Conduit,Tray Cover or Wrapping of Siltemp Woven Ceramic Tape Will Be Used for Compliance

ML20028D218
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	01/14/1983
From:	James Smith LONG ISLAND LIGHTING CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
SNRC-779, NUDOCS 8301170238
Download: ML20028D218 (2)

Text

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Awamamw SHOREHAM NUCLEAR POWER STATION P.O. BOX 618, NORTH COUNTRY ROAD e WADING RIVER, N.Y.11792 January 14, 1983 SNRC-779 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Electrical Separation Shoreham Nuclear Power Station - Unit 1 Docket No. 50-322

Reference:

1) Letter NRC (R. L. Tedesco) to LILCO (M. S. Pollock), dated 8/31/81

2) Letter, SNRC-712, LILCO (J. L. Smith) to NRC (H. R. Denton), dated 6/18/82 1

j

Dear Mr. Denton:

This letter further clarifies our position concerning elec-trical separation as defined by IEEE 384-1974 and the Regulatory Guide 1.75 Rev. 1 in regard to:

, 1) What constitutes an acceptable electrical separation f

barrier.

2) What constitutes an acceptable distance between the separation barrier and a redundant Class lE circuit.

A series of tests conducted for LILCO, at hyle Laboratories, (Test No. 46287), has conclusively demonstrated that a single conduit, tray cover, or wrapping of Siltemp woven-ceramic fiber covered with 3M No. 69 glass tape constitutes an acceptable separa-

! tion barrier for protection against clectrically-generated faults as outlined in IEEE 384-1974. This test was performed to con-servative criteria with configurations exceeding the cable instal-lation at the Shoreham Nuclear Power Station.

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f January 14, 1983 Mr. Denton Page Two Wyle Test No. 46287 further demonstrated that a single separa-tion barrier, where the barrier is one of the aforementioned three, provides adequate protection when there is no physical separation (distance) between the barrier and the redundant circuit.

In the Reference 1 letter, the NRC outlined four (4) options available to LILCO for dispositioning electrical separation deficiencies. In those cases where LILCO intends to comply by utilizing Option 3, i.e. " correct the deficiency by installing an acceptable barrier", an acceptable barrier is a single conduit, tray cover, or wrapping of Siltemp woven-ceramic tape with 3M Scotch Brand No. 69 glass tape, as proven in Wyle Labs Test No.

46287.

With regard to the Reference 2 letter, LILCO intends to provide a one (1) inch minimum separation between an acceptable barrier and a redundant circuit wherever practical. However, in those cases where a minimum separation of one (1) inch cannot be practically maintained, and where supported by the test results, LILCO intends to use the data based on the results of Wyle Labs Test No. 46287 in accepting the configuration. This method is allowable in accordance with the Forward and Sections 5.1.1.2 and 5.1.1.3 of IEEE 384-1974.

A copy of the Wyle Laboratories test report, which is proprietary to LILCO, is available for inspection at the Shoreham plant site.

An FSAR change will be prepared to re# lect the information con-tained in this letter.

Should you have any questions or require additional information, please contact this office.

Very truly yours, J

. L. Smith Manager, Special Projects Shoreham Nuclear Power Station TJS/jm cc: J. Higgins All Parties