ML20096D061

Advises That Discrepancies Discovered During Walkdown of Cable Tray Supports for Phase 4 of Independent Assessment Program.Response to Encl Questions Requested

ML20096D061
Person / Time
Site:	Comanche Peak
Issue date:	08/16/1984
From:	Williams N CYGNA ENERGY SERVICES
To:	George J TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
84056.021, NUDOCS 8409050533
Download: ML20096D061 (6)

Text

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rs 101 California Street. Suite 1000 San Francisco, CA 941115894 415 397-5600 August 16, 1984  !

84056.021 Mr. J. B. George Project General Manager Texas Utilities Generating Company Highway FM 201 l Glen Rose, Texas 76043 '

Subject:

Cable Tray Support Walkdown Questions Comanche Peak Steam Electric Station Independent Assessment Program - Phase 4 Texas Utilities Generating Company Job No. 84056

Dear Mr. George:

Cygna conducted a walkdown of the various cable tray supports to assure that the as-built condition properly reflects the designed support. Some discrepancies ware discovered during the course of the walkdown. These discrepancies are listed in Attachment A. Please provide the information requested for each item.

If there are any questions, don't hesitate to call.

Very truly yours, c -

N. H. Williams Project Manager NHW:jm cc: Mr. S. Burwell Mr. S. Treby g Mr. D. Wade Mr. G. Grace Mrs. J. Ellis Mr. R. Ballard

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l Mr. J. B. George August 16, 1984 84056.021 Page_1 of 2 Attachment A Cable Tray Support Walkdown Questions

1. Support 332, Type: Detail "A", Drawing 2323-El-0700-01-S.

The lower cantilevered channel section, C6 x 8.2, is in contact with the insulation of the Train B Component Cooling Water heat exchanger. Please explain what criteria, if any, the CPSES project used for separation of safety related components and cable tray supports-

2. Support 408, Type: B. 4

a. This support was modified to provide a notched corner in CMC 9916. Part of this modification included the addition of a channel section, C4 x 7.25. Cygna's walkdown documentation shows that a C6 section was used instead of the C4. Although the use of this larger section does not impair the load resisting capabilities of the support, it is important to ensure that proper controls exist authorizing construction to deviate from a design. Please provide documentation permitting the use of a C6'section rather than the C4 section specified on CMC 9916.

b. Cygna noted that the lower north corner of support 408 was in contact with the insulation of the Train B Component Cooling Water heat exchanger. Please explain what criteria, if any, the CPSES project uses for separation of safety related components and cable tray supports.

3. Support 455, Type: SP-8.

Cygna's walkdown documentation shows that the southern angle brace from the C6 x 8.2 vertical hanger member is attached to the base angle between the anchor bolt and the end of the angle as shown in the attached sketch. The original design configuration specif.ies that the brace shall be located between the anchor bolts with a maximum eccentricity from the bolt centerline. Cygna notes that the installed brace connection

configuration matches the original fabrication drawing (Sheet 455, revision 2, of drawing FSE-00159). Please provide the existing calculations which demonstrate the acceptability of the installed brace

, connection configuration since it is different than the original design j assumptions.

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4. Support 649, Type: A. 1 i l Cygna observed that the installed single base angle attachment is a 5" x 5" x 3/4" angle. Drawing 2323-S-0903, revision 5 specifies that the angle shall be 6" x 6" x 3/4". The use of a smaller angle may result in l

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Mr. J. B. George August 16, 1984 84056.021 Page 2 of 2 Attachment A (Continued)

Cable Tray Support Walkdown Questions stresses which exceed design allowables. Please provide justification for the use of the smaller angle section for this support.

5. Supports 722 and 2606, Type: Detail "N", drawing 2323-El-0601-01-S.

Cygna's walkdown documentation shows that the working point of the brace connection to the base angle is through the centerline of the . top anchor bolt as shown in the attached sketch. This configuration forces the entire brace load to be resisted by a single anchor bolt which is not consistent with the original design. Please provide justification for the adequacy of the installed connections.

6. Support 3022, Type: Detail "F", drawing 2323-El-0601-01-S.

Cygna's walkdown noted that the base plate for support 3022 has excessive gaps under approximately 50% of the base plate surface area. Please provide justification on the acceptability of such large gaps.

7. Support 2953, Type: Detail "F", drawing 2323-El-0601-01-S.

Cygna noted that support 2953 is attached to an 8" wide embedded plate.

The lower edge of the plate is 4" from a penetration sleeve. Please describe the guidelines used on the.CPSES project to ensure that penetrations and embedded plates are sufficiently spaced to allow for full development of the embedded plate load carrying capability.

8 Support 6654, Type: A-2.

CMC 90714 details the connection between the east leg and the base angle of the support. The attached sketch shows the constructed configuration of the connection. The installed detail provide $ more weld length than originally specified, but the points of attachment and weld length are different than that specified on CMC 90714 Please provide documentation which permits the change in the connection detail as noted above.

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