TXX-6881, Final Deficiency Rept CP-87-06 Re Seismic Qualification of as-built 480 Volt Power Ctrs.Initially Reported on 870406. Top Entry of Feed Cables Has No Impact on Transformer Qualification.No Mods Required

Final Deficiency Rept CP-87-06 Re Seismic Qualification of as-built 480 Volt Power Ctrs.Initially Reported on 870406. Top Entry of Feed Cables Has No Impact on Transformer Qualification.No Mods Required

ML20236C888
Person / Time
Site:	Comanche Peak
Issue date:	10/21/1987
From:	Counsil W, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CP-87-06, CP-87-6, TXX-6881, NUDOCS 8710270384
Download: ML20236C888 (2)

Text

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F e 0 10 903.10 M1 ELECTRIC Ref # 10CFR50.55(e)

William G. Counsil '

em,m, n, emu,# October 21, 1987 '

4 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET N05. 50-445 AND 50-446 SEISMIC QUALIFICATION OF AS-BVILT 480 VOLT POWER CENTERS SDAR: CP-87-06(FINALREPORT)

Gentlemen:

On April 6,1987, we verbally notified your Mr. C. Hale of a deficiency involving the 480 volt, 2000 KVA dry type transformers. Our last interim report was logged TXX-6706, dated September 4,1987. After further evaluation we have determined that this item is not reportable under the provisions of 10CFR50.55(e). This is our final report on this issue.

The transformers were originally seismically qualified by the vendor (Westinghouse) with the primary feed high voltage cables routed through the bottom of the transformer enclosure. In the CPSES installed configuration, the feed cables were routed through the top of the enclosure.

Effects of the top entry were evaluated using finite element analysis (Ref:

Impe11 calculation IMT-CA-EQ-0214-ES06, Rev. 0) which included the additional weight due to the top entry. Stresses were evaluated locally (near the entry) and globally (in the cabinet), and were found to comply with the AISC Manual of Steel Construction limits. Therefore, top entry has no impact on the transformer qualification and no modifications are necessary.

8710270384 871021 PDR ADOCK 05000445 S PDR 400 North Olne Street LB 81 Dallas, Texas 75201

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, , < l Documents supporting this conclusion are available.for review by-your inspectors at.the CPSES plant site.

Very-truly.yours,  ;

l ' {p).D. &

W. G. Counsil o

1 By:

D. R.-Woodlan.

Supervisor, Docket Licensing; WJH/gj-c - Mr. R; D. Martin',. Region IV' ..

~ Resident: Inspectors,CPSES(3)  !

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