ML20133E297

Requests Technical Analysis of Separation Criteria of Class 1E Cables from non-Class 1E Cables,Including Bases & Assumptions Supporting Lesser Separation Criteria Using Listed Guidelines

ML20133E297
Person / Time
Site:	Byron, Braidwood, 05000000
Issue date:	07/15/1985
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Farrar D COMMONWEALTH EDISON CO.
References
NUDOCS 8507220456
Download: ML20133E297 (4)

Text

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..... JUL 151985 Docket Nos.: STN 50-455, STN 50-456 and STN 50-457 Mr. Dennis L. Farrar Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690

Subject:

Supplemental Request for Additional Information - Byron Unit 2 .

and Braidwood, Units 1 and 2 A site visit was conducted on May 21-23, 1985 at Braidwood Station, Units 1 and 2 in order to view the installation and arrangement of electrical equipment and cables. During this visit specific issues identified during the Braidwood Station Construction Appraisal Team (CAT) inspection were discussed. The CAT inspection revealed several points regarding physical separation, particularly between Class IE and non-Class IE cables. Commonwealth Edison Company's (CECO's) criteria established in the Byron /Braidwood Stations FSAR for separation between redundant Class IE raceways is consistent with R. G. 1.75. However, the criteria for separation of non-Class IE from Class IE cable raceways is established at the reduced distance of 12 inches vertical and 3 inches horizontal which deviates from the separation criteria of R. G. 1.75. Acceptability of CECO's lesser separation criteria between Class 1E and non-Class IE raceways, with bases and jdstification, were not addressed in the Byron /Braidwood Safety Evaluation Report (SER). This omission in the SER has resulted in differences in interpretation of  !

requirements by the NRC inspectors and CECO and the A/E.

Therefore, it is necessary to perform an evaluation of CECO's separation criteria of Class IE cables from non-Class IE cables in order to eliminate any discrepancies and misinterpretation of separation requirements in this area.

To facilitate this review, CECO must provide a technical analysis which includes bases and assumptions supporting the lesser separation criteria using the following guidelines:

Non-Class IE circuits shall be separated from associated circuits and Class IE l circuits by the minimum separation requirements specified in IEEE-384-1974 en-dorsed by R. G. 1.75. The effects of lesser separation between the non-Class IE circuits and Class IE circuits shall be analyzed to demonstrate that Class IE circuits are not degraded below an acceptable level. The technical analysis A

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R 151985 Mr. Dennis L. Farrar for the lesser separation criteria, which are proposed and implemented, should be based on realistic assumptions and premises.

The above information needs have been discussed with CECO. Please provide your

response within 20 days of receipt of this letter. If any further clarification

! is needed, please contact Janice A. Stevens, Licensing Project Manager, at (301)

, 492-7144.

Sincerely, I

'Originn.1 cir. nod by:

3. J. Youn3blood (

B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing l cc: See next page l

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JUL 151985 Mr. Dennis L. Farrar Commonwealth Edison Company Byron /Braidwood cc:

Mr. William Kortier Dr. Bruce von Zellen Atomic Power Distribution Department of Biological Sciences Westinghouse Electric Corporation Northern Illinois University Post Office Box 355 DeKalb, Illinois 61107 Pittsburgh, Pennsylvania 15230 Joseph Gallo. Esq. U. S. Nuclear Regulatory Commission Isham, Lincoln & Beale Byron / Resident Inspectors Office 1120 Connecticut Ave., N. W. 4448 German Church Road Suite 840 Byron, Illinois 61010 Washington, D. C. 20036 Ms. Diane Chavez C. Allen Bock, Esquire 528 Gregory Street .

Post Office Box 342 Rockford Illinois 61108 Urbana, Illinois 61801 Mrs. Phillip B. Johnson Thomas J. Gordon, Esquire 1907 Stratford Lane Waaler, Evans & Gordon Rockford, Illinois 61107 2503 S. Neil Champaign, Illinois 61820 Douglass Cassel, Esq.

109 N. Dearborn Street Ms. Bridget Little Rorem Suite 1300 Appleseed Coordinator Chicago, Illinois 60602 117 North Linden Street Essex, Illinois 60935 Ms. Pat Morrison 5568 Thunderidge Drive Mr. Edward R. Crass Rockford, Illinois 61107 Nuclear Safeguards and Licensing Division David C. Thomas, Esq.

Sargent & Lundy Engineers 77 S. Wacker Drive 55 East Monroe Street Chicago, Illinois 60601 Chicago, Illinois 60603 Rebecca J. Lauer, Esq. >

U. S. Nuclear Regulatory Commission Isham, Lincoln & Beale Resident Inspectors Office Three First National Plaza RR#1, Box 79 Suite 5200 Braceville, Illinois 60407 Chicago, Illinois 60602 i

- 2- Byron /Braidwood cc:

Regional Administrator U. S. NRC, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Erie Jones, Director Illinois Emergency Services

, and Disaster Agency 110 East Adams Springfield, Illinois 62705 Ms. Lorraine Creek Rt. 1, Box 182 Manteno. Illinois 60950 .

Mr. Michael C. Parker, Chief i Division of Engineering Illinois Department of Nuclear Safety 1035 Outer Park Drive Springfield, Illinois 62704 Michael Miller Isham, Lincoln & Beale One First National Plaza 42nd Floor Chicago, Illinois 60603 Jane M. Whicher Esq.

109 N. Dearborn Street Chicago, Illinois 60602

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