ML20092C344
| ML20092C344 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 06/15/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| 2NRC-4-084, 2NRC-4-84, 83-05-09, 83-5-9, NUDOCS 8406210136 | |
| Download: ML20092C344 (2) | |
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2NRC-4-084 (412) 787 - 5141 Telecopy 8
Nuclear Construction Division June 15, 1984 Robinson Plaza, Euilding 2, Suite 210 Pittsburgh, PA 15205 United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Mr. George W. Knighton, Chief Licensing Branch 3 Of fice of Nuclear Reactor Regulation
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Unresolved Item 83-05-09 Gentlemen:
The attached information is provided as requested in a meeting held on May 17, 1984, to discuss Unresolved Item 83-05-09, " Cable Tray Fill."
This information (Table 8.3-4) will be incorporated in a future amendment to the Beaver Valley Power Station Unit 2 Final Safety Analysis Report.
DUQUESNE LIGHT COMPANY By E. "J. ~ Woo leve r Vice President Gil0/wj s Attachment cc:
Mr. H. R. Denton (w/a)
Mr. D. G. Eisenhut (w/a)
Mr. E. A. Licitra, Project Manager (w/a)
Ms. M. Ley, Project Manager (w/a)
Mr. C. Anderson, Chief, Plant Systems Section, EPB (w/a)
Mr. G. Walton, NRC Resident Inspector (w/a) 8 8406210136 840615 i
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DRAFT COPY TABLE 8.3-4 X CABLE TRAYS TABLE AND NOTES CABLE IN TRAYS To be consistent with the computer program for cable schedules, and to meet certain documentation requirements for nuclear - installations, the following identification, cable loadings, and tray fill requirements should be applied when engineering a cable distribution system in trays:
Tray Conductors Maximum Identification Voltage Size Service Tray Fill Notes H
601 V to All Power 1 Layer Maintained opacing*
2 4,160 V Conductors produce heat from I R losses L
600 V All Power 1 Layer Maintained spacing
- 2 Conductors produce heat fr om 1 R losses 2
No conductor 1 R loss heating K***
600 V No. 8 AWG Miscellaneous 50%****
1.
copper and services or smaller 2.
Intermittent service **
or 3.
Sized and derated in accord-ance with IPCEA Publication No. P-54-440 C
120-125-As required Control and 50%****
600V insulation 240 V Alarm X
Low Level As required Instrument, 50%****
Generally shielded cables communtcation, etc.
- Maintained spacing of 0.25 to 1.0 cable diameter on both sides of each cable in a tray, cables derated in a
accordance with IPCEA, Table VII, Line 1.
- Intermittent is understood to mean operation for not more than 40% of the time and for not longer than 30 min. for any one operation.
- The K tray cables may be composed of any one or any combination of the three types. Only the Type 3 cables need to have a derat ing. factor applied.
Specified pe rcent fill can be exceeded upon written approval from Engineers.
50% tray fill is achieved
- when the sum of the cross-sectional areas of all cables routed in the tray section equals 50% of the avail-able cross-section area of the tray, For this condition, the Design Basis computer system, wh ich calcu-lates tray fill based on 3" deep tray whether 3" or 4" deep tray is used, would report the tray section fill as 100%.
In a typical ins t al l a t ion, 50% cross sectional fill will result in cable being level with, or below, the top of the tray siderail. Maximun calculated cable depth in "C" and "X" tray will be limited to 1.5" above the top of the tray siderail.
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