ML20096C188

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

ML20096C188
Person / Time
Site:	Comanche Peak
Issue date:	08/13/1984
From:	Williams N CYGNA ENERGY SERVICES
To:	George J TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
84056.020, NUDOCS 8409050148
Download: ML20096C188 (6)

Text

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EM 101 Cahfornia Street. Suite 1000. San Francisco. CA 941115894 415 397-5600 August 13, 1984 84056.020 Mr. J. B. George Project General Manager Texas Utilities Generating Company Highway FM 201 Glen Rose, Texas 76043

Subject:

Conduit 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 cf the various conduit supports to assure that the as-built condition properly reflects the designed support. Several discrepan-cies were 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, oh

• N. H. Williams Project Manager NHW:jm cc: Mr. S.-Burwell Mr. S. Treby  !

Mr. D. Wade Mr. G. Grace Mrs. J. Ellis p l Mr. R. Ballard S I 5W ^ *?b%

8409050148 840813 PDR ADOCK 05000445 A PDR

@Y*fQ 10 1 San Francisco Boston Chicago Richland

e Mr. J. B. George August 13, 1984 84056.020 Page 1 of 2 ATTACWENT A CONOUIT WALKDOWN QUESTIONS

1. Support C12902935-4, Type CSM-6b (Reference drawing 2323-5-0910, shtCSM-6b)

Member P1001C3 is attached to a bridge beam which is specified as a Unistrut P1001 section in the above-referenced drawina. The installed section is a P5000 which is not indicated on any available documentation. Use of a P5000 section instead of a P1001 section will affect the support's load carrying capability since a P5000 has lower section properties.

Please provide Cygna with justification for using a P1001.

2. Conduit C12G02851 contains an S3 offset of 2'-10".

for a 1" diameter conduit per drawing 2323-S-0910,The p. 6,allowable S3 offset sht 2, revision 8 is 2'-3". (See Cygna isometric sheet, attached).

Please provide Cygna with justification for allowing an offset dimension of S3 = 2*-10" for conduit C12G02851 which exceeds the allowable of S3 = 2'-3".

3. Conduct supports C12G02851-6 and C12902935-3 are type CA-Sa supports.

Cygna's walkdown noted that the conduit clamps were severely deformed in their installed position. As indicated by the attached sketch, even with the clamp deformation, expansion anchor nuts and washers were in full bearing against the clamp, indicating that the anchors were installed at angles to the perpendicular to the concrete surface.

Please provide Cygna with documentation which addresses the acceptability of deformed clamps as described above.

4. For support C11904359-1, type IN-CSM-15a, Cygna's walkdown noted the installed configuration appears as shown in the attached sketch. Due to an irregular concrete surface, the leg of the right angle is not flush against the tube steel section but is rotated such that the tip of the other leg is in bearing against the concrete. t The installed configuration impacts the functional capacity of the support in the following fashion:

i a. The bearing area required for proper load transfer at the support concrete interface may not exist which would result in concrete stresses greater than allowables.

1 l

l Mr. J. B. George August 13, 1984 84056.020 Page 2 of 2 i

ATTAC K NT A (Continued)

b. With the angle rotated as shown, only one side of the Hilti expansion

! anchor is in bearing against the angle. Such a configuration results in

{ the introduction of bending stresses within the bolt which have not been considered in the design.

c. Due to the rotation of the angles, it would not be possible to place the

} groove welds between the tube and the angle as shown on the support l drawing.

Please provide Cygna with justification for QC acceptance of the base angle installation for support C11904359-1.

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