ML20113C671
| ML20113C671 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 01/14/1985 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| KMLNRC-85-030, KMLNRC-85-30, NUDOCS 8501220389 | |
| Download: ML20113C671 (3) | |
Text
r a
KANSAS GAS AND ELECTRIC COMPANY THE ELECTAC COMPANY OLENN L MOESTER WCE P#f 5sOEme? DavCLE AR January 14, 1985 Mr. Harold R. Denton, Director Of fice of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555 KMLNRC 85-030 Ret Docket No. STN 50-482 Subj: FSAR Changes Relating to the Raceway and Cable Separation
Dear Mr. Denton:
SNUPPS FSAR Section 8.3.1.4.1.1 addresses raceway and cable separation criteria. Transmitted herewith is a marked up change to the SNUPPS FSAR which addresses the cases of open trays containing safety related cables and totally enclosed conduits containing non-safety related cables. This change is part of the corrective action for the Notice of Violation contained to Inspection Report STN 50-482/84-51.
This information will be formally incorporated into the next revision of the Final Safety Analysis Report. This information is hereby incorporated into the Wolf Creek Generating Station, Unit No.1, Operating License Applicaticn.
Yours very truly, WM tM t
Glenn L. Koe ter Vice President - Nuclear GLK: dab Attach xc P0'Connor ilBundy WGuldemond l ]f fyTE$*
O 201 N. Market - Wichita, Kansas - Mad Address: RO. Box 208 I Wichita, Kansas 67201 - Telephone: Area Code (316) 2616451
F HA Denton Attachment to XMLNRC 85-030 Page 1 SNUPPS
/
b.
For cable trays of different separation groups, there is a minimum vertical separation of 5 feet between open-top trays stacked vertically.
In the limited number of areas where trays of different separation groups are stacked with less than 5 feet of vertical separation, a fire barrier is placed between the two separation groups.
The barrier extends 1 foot to each side of the tray system (or to the wall).
c.
In the case where a tray of one separation group crosses over a tray of a different separation group and the vertical separation is less than 5 feet, a fire barrier is installed extending 1 foot from each side of each tray and 5 feet along each tray from the crossover.
d.
Where it is necessary that cables of different separation groups approach the same or adjacent control panels with less than 3-foot horizontal or 5-foot vertical spacing, isolation is maintained by installing both separation groups in steel conduit l
or enclosed wireway or by installing fire barriers between the separation groups.
In the case of horizontal separation, the barrier extends 1 foot below the bottom of the tray (or to the floor) to f
1 foot above the top of the tray (or to the ceiling).
In the case of vertical spacing, the barrier extends 1 foot on each side of the tray system (or to the wall).
e.
Isolation between separation groups is considered to be adequate where physical separation is less than that indicated in Items a, b, and c above, provided the circuits of different separation groups are run in enclosed raceways that qualify as barriers or other barriers are installed between the different separation groups.
The minimum distance between these enclosed raceways and be-tween barriers and raceways is 1 inch.
The bar-riers are installed as described in a through d above.
CABLE SPREADING AREAS - The cable spreading area does not contain high energy equipment such as switchgear, trans-formers, rotating equipment, or potential sources of missiles or pipe whip and is not used for storing flammable materials.
(circuits in the cable spreading area are limited to control and instrument functions and also those power supply circuits 4
Rev. 6 8.3-25 8/81
s o
Mr. H. R. Denton Attachment to KMLNRC 85-030 Page 2 INSERT A In cases of open trays containing safety-related cables and totally enclosed conduits containing non-safety related cables, the safety design basis is to protect the safety related cables f rom failure of the non-safety related circuits, and not vice-versa. In consideration of this lim'it, enclosing the non-safety circuits in raceway and maintaining at least 1-inch separation provides an acceptable level of protection. The conduit can contain only a limited quantity of combustible material (cable insulation & jacket). All SNUPPS cables, including those used for non-safety related circuits, are qualified to IEEE-383 and meet the flame-retardance requirements specified therein; the cables will not support combustion. Furthermore, there is insufficient oxygen inside the conduit to support combustion of more than f raction of the available material.
Based on these considerations, it is established that 1-inch separation between a conduit containing non-safety related circuits is sufficient to assure that any failure within the non-safety related circuits will not propogate into and compromise the integrity of the safety related circuits.
.