ML20154C976

Forwards Sser Re Electrical Separation Deficiencies Revealed During Const Appraisal Team Insps 50-456/84-44 & 50-457/84-40.Evaluation Concludes That Proposed Criteria for Separation of Class 1E & non-Class 1E Cables Acceptable

ML20154C976
Person / Time
Site:	Braidwood
Issue date:	02/25/1986
From:	Stevens J Office of Nuclear Reactor Regulation
To:	Partlow J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
Shared Package
ML20154C980	List: IR 05000456/1984044 ML20154C976
References
NUDOCS 8603050380
Download: ML20154C976 (3)

See also: IR 05000456/1984044

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Docket Nos. 50-456/457

MEMORANDUM FOR: James G. Partlow, Director

Division of Inspection Programs

Office of Inspection and Enforcement

THRU

Vincent S. Noonan, Director

l PWR Project Directorate #5 ,

Division of PWR licensing-A

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FROM: Janice A. Stevens, Project Manager

PWR Project Directorate #5 i

Division of PWR I.icensing-A l

SUBJECT: CAT INSPECTION FOR BRAIDWOOD STATION, UNITS 1 AND 2

In your March 15, 1985 memorandum to Hugh L. Thompson, Jr., you requested NRR

assistance in reviewing several deficiencies regarding electrical separation

that were revealed during the Braidwood Station Construction Appraisal Team

(CAT) inspection.

In response to your request, NRR has reviewed the CAT inspection report

50-456/84-44, 50-457/84-40, dated February 20, 1985, with regard to the

deficiencies related to the physical separation between safety-related cables

and nonsafety-related cables. These deficiencies derive from exceptions to

the recommendations of R.G. 1.75.

NRR reevaluated this item and has reviewed the deviations from R.G. 1.75 in a

separate SSER (Enclosed). We have summarized below the results of our

evaluation on cable separation as it relates to the separation of

safety-related cables and nonsafety-related cables.

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The Byron /Braidwood raceway design is based on the standard separation '

criteria contained in IEEE 384-1974 as endorsed by R.G. 1.75. However, the

separation criteria between the non-Class 1E and Class 1E cables is less

than the standard separation distance recommended by R.G. 1.75. In order to

provide justification for these lesser separation distances, the applicant

instituted a test program conducted by Wyle I.aboratories. The test program

methodology and results, submitted by the applicant by letters dated August 6

and October 22, 1985, were reviewed by the staff. The proposed criteria for

separation of Class 1E and non-Class IE cables which the staff has evaluated

in the SSER are as follows:,

1. Separation distances of twelve (12) inches vertical and three (3)

inches horizontal between safety-related and nonsafety-related

raceways.

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2. Separation of safety-related cables routed in free-air in contact

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! of nonsafety_related cables routed in free-air in contact with a

raceway containing safety-related cables.

l 3. Vertical or horizontal free-air cable in parallel with vertical or

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horizontal free-air cable with six (6) inches horizontal and

vertical separation.

Based on our evaluation, as documented in the enclosed SSER, the above

separation criteria are acceptable. These criteria address the deficiencies

which the CAT identified and resolve their concerns to the satisfaction of the

staff. The applicant is required to specify these lesser cable separation

criteria in the Byron /Braidwood Stations FSAR.

Another issue identified during the CAT inspection involved the applicant's

use of the term " quasi safety-related." The applicant has stated that this

term is used to identifiy safety-related circuits qualified to Class 1E

requirements which are installed in a non-Seismic Category I building. The

applicant is required to have this term defined in the Sargent and I. undy

design criteria manual.

Janice A. Stevens, Project Manager

PWR Project Directorate #5

Division of PWR I.icensing-A

Enclosure: SSER on Cable Separation

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2. Separation of safety-related cables routed in free-air in contact

with a raceway containing nonsafety-related cables, and separation

of nonsafety-related cables routed in free-air in contact with a

raceway containing safety-related cables.

3. Vertical or horizontal free-air cable in parallel with vertical or

horizontal free-air cable with six (6) inches horizontal and

vertical separation.

Based on our evaluation, as documented in the enclosed SSER, the above

separation criteria are acceptable. These criteria address the deficiencies

which the CAT identified and resolve their concerns to the satisfaction of the

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staff. The applicant is required to specify these lesser cable separation

criteria in the Byron /Braidwood Stations FSAR.

Another issue identified during the CAT inspection involved the applicant's

use of the term " quasi safety-related." The applicant has stated that this

term is used to identify safety-related circuits qualified to Class IE

requirements which are installed in a non-Seismic Category I building. The

applicant is required to have this term defined in the Sargent and Lundy

design criteria manual.

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Jahice A. Stevens, Project Manager

PWR Project Directorate #5

Division of PWR licensing-A

Enclosure: SSER on Cable Separation

cc: L. Olshan

S. Rhow

S. Treby

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