ML20096C025
| ML20096C025 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 07/31/1984 |
| From: | Williams N CYGNA ENERGY SERVICES |
| To: | George J TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| 8405.013, NUDOCS 8409040471 | |
| Download: ML20096C025 (13) | |
Text
{{#Wiki_filter:r um,, 101 California Street, suite 1000. San Franc:sco, CA 94111 5894 415 3N-55 39 July 31, 1984 84056.013 Mr. J. B. George Project Manager Texas Utilities Generating Company Highway FM 201 Glen Rose, Texas 76043
Subject:
Pipe Support Review Questions Comanche Peak Steam Electric Station Independent Assessment Program - Phase 4 Job No. 84056
Dear Mr. George:
Attached please find a list of pipe support questions resulting from the Phase 4 analytical reviews and walkdowns. submittal to TUGC0 on August 6,1984The remaining questions are scheduled for If you have any questions or require clarification prior to responding to any of these questions don't hesitate to call. Very truly yours, 4),%% N. H. Williams Project Manager c> ' 4 4 5 Attachments Mr. G. Grace (w/ attachment) cc: NMr. D. Wade (w/ attachment) Mr..S. Burwell (w/ attachment) (Mr. S. Treby -(w/ attachment). Mrs. J. Ellis (w/ attachment) 8409040471 840731 i PDR ADOCK 05000445 A PDR c,,. M- .wh l' San Francisco Boston Chicago Rechland _a
Mr. J. B. Ge:rga July 31, 1984 Page 1 of 3 PIPE SUPPORT QUESTIONS 1. In reviewing ITT-Grinnell snubber rear-brackets (Figure 307N), Cygna has found that the dimensions used in the design calculation match those in the field, but not those from Revision 15 of the DRS. Is there an earlier or later revision from which these brackets were taken? If so, please provide the appropriate reference. Examples: CC-1-028-004-A33K (6-1/2 x 9-3/4 vs. 4-1/2 x 6-3/4) CC-1-028-022-S33K (6-1/2 x 9-3/4 vs. 4-1/2 x 6-3/4) CC-1-019-011-A43K (4-7/8 x 3-1/2 vs. 2-7/8 x 2) CC-X-080-001-001-A43K (4-7/8 x 3-1/2 vs. 2-7/8 x 2) 2. In examining Quality Control procedure QI-QAP-11.1-28, Cygna has noted that there is no written direction or. set limits for the QC inspectors to accept or reject support material distortions. Please explain how TUGC0 assures that material distortions, such as warped tube steel, are checked in the field and accounted for in the design calculations as necessary. 3 During the walkdown, Cygna noted a number of supports with incorrect tag numbprs It is Cygna's understanding that the BRHL drawings will not be part.4 tio permanent plant records. Given these facts, how will TUGC0 be able t.' mtch a support design calculation to a particular support in the field or perform modifications on the correct support, once operation has commenced? Examples: CC-1-028-017-533R marked as CC-1-087-002-S33R CC-1-028-023-S33R marked as CC-2-008-714-S33R CC-1-019-006-A43R marked as CC-1-028-003-S33R CC-1-019-010-A43R marked as CC-1-051-010-A43K CC-1-019-014-A43R marked as CC-1-051-014-A43K 4 In reviewing procedure QI-QAP-11.1-28, which is used by QC for inspections, Cygna has found two tolerances which do not seem reasonable for all possible applications: a) Working Point Dimensions = t 1" b) Location on Support Steel =
- 2" In case a) there is no limit set on the working point dimension.
For example,. in support CC-1-028-023-S33R, the U-bolts in Section A-A are actually 3" apart, not 4". would also be within the tolerance.Although this is within the i 1" tolerance, 5" A 5" dimension would increase plate stresses by 25%. As another example, in CC-1-028-001-A33R, the dimension in section C-C from the bracket centeriine to the right edge should be 8-3/8" instead of 7-3/8", i.e. the baseplate is 14" wide. While the bolt hole is located in the proper po,sition, this change in plate size could affect the prying action, i
.Mr.'J. B. Ge:rge - July 31,1984 Page 2 of 3 In case b) there is also no lower limit set. For example, in support CC-1-077-005-S33R, the top of the rear bracket does not extend 1/4" above the steel as specified, but is 15/16" below it. Again, it could have extended 2-1/4" above the steel and still be within the required tolerance. This would affect weld stresses. What justification does.TUGC0 have' that the above tolerances are acceptable for all dimension ranges? 5. In examining support CC-1-031-009-S33R, Cygna noted that the edge of a baseplate from CC-1-028-038-S33R is welded to the embedment plate within 6" of the baseplate for this support. It is Cygna's understanding, based on discussions with Gibbs and Hill, that the embedment plate allowable loads in specification 2323-SS-30 are based on applied point loads spaced a minimum of 12" apart. Since there appears to be no direction given to QC for determining the acceptability of attachment spacing to embedded plates, please provide justification that the use of embedment plates at CPSES is in agreement with the assumptions used to derive allowable loads, i.e., no applied loads closur than 12" spacirg. 6 In response to a Phase 3 question regarding load sharing on double struts or snubbers, TUGC0 responded by referencing the Affidavit by Dr. Iotti and Mr. Finneran, "Regarding Consideration of Force Distribution -in Axial Restraints." That study does not account for the initial fit-up effect. During the Phase 4 walkdowns Cygna found two cases with double struts in which one strut was loose eno, ugh to move by hand (MS-1-002-002-S72R, CC 028-034-533R). Please justify this phenomena in the context of the force distribution. 7 CC-1-028-024-S33R, drawing revision 11. In Section C-C, the lower rear bolt (just past the canted bolt) is located 2" from the tube steel centerline, rather than on the centerline as shown in the drawing. Since this is outside the i 1/4" bolt hole tolerance specified in QI-QAP-11.1-28, please justify this omission from the inspection report records. 8. MS-1-002-004-S72R, drawing revision 2. The 1/2" minimum gap between the nut and item 31 shown on the drawing does not exist in the field. i Please justify this discrepancy. Note: not available at the time of Cygna's review.The inspection report for this support was 9. MS-1-004-003-S72R drawing revision 4. Looking toward the concrete wall, tiU' left hand side double nuts are not snugged up against each other. This could allow the nuts to loosen due to inplant vibration and prevent the support from functioning. Please explain this omission from the inspection report.
Mr. J. B. Georg2 July 31,1984 Pagn 3 of 3
- 10. MS-1-003-007-C72K, drawing revision 10 In the original review of support MS-1-003-007-C72K, Cygna did not find sufficient dimensioning in section J-J detail 46 to determine where the rear bracket was weided to item 35 the Phase 4 walkdown, Cygna was able to measure the actual dimensions asDuring shown on the attached sketch, a)
Did the designers size item 35 without dimensions based on assumptions which were not stated? b) Given the as-built data, please provide calculations showing item 35 is adequate to transfer the load from the rear bracket to item 22 i 1 J
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