ML20215B422

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Rev 0 to Clarification of Impell Cth Design Verification Criteria/Methods for Resolution of Cygna Audit Concerns, Member Substitution in Impell Support Calculation CTH-1-13197
ML20215B422
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 05/15/1987
From: Ashley G
ABB IMPELL CORP. (FORMERLY IMPELL CORP.)
To:
Shared Package
ML20215B058 List:
References
IM-P-007, IM-P-007-R00, IM-P-7, IM-P-7-R, NUDOCS 8706170322
Download: ML20215B422 (4)
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CLARIFICATION OF IMPELL CTH DESIGN VERIFICATION CRITERIA / METHODS FOR RESOLUTION OF CYGNA AUDIT CONCERNS l

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Member Substitution in Impe11 Support Calculation  !

CTH-1-13197 (

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Prepared for:

Texas Utilities Electric Company Prepared by:

Impe11 Corporation 0210-040/041 1 1

IM-P-007 -

Revision 0 Prepared by: Mw (/ f

((72ks" S//s/g;s Approved by: 8 / M i -/.r - 4 7

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lPoS62$8SE$Nohi5 A

IM-P-007 ]

CONCERN:

Calculation for CTH-1-13197 does not indicate that the MC6X12 channel sections have been evaluated for potential member substitution' .

BACKGROUND: Impe11 support calculation' CTH-1-13197 contains an inaccessible MC6X12 channel section. Per Impell Project Instruction PI-11 (see attached excerpt) inaccessible MC6X12 and MC3X9 channel sections must.be evaluated for the possibi,11ty of a member substitution.

, Note, however, that the revision to PI-11 which added this criteria was issued after the calculation was completed. Note also that the calculation is to go through a final close-out review before formal issue and the criteria will be considered in that final review.

DISCUSSION: A review of support calculation CTH-1-13197 shows a maximum member stress interaction of 0.27 (see attached excerpt from calculation CTH-1-13197). Per Impe11 Project Instructions an inaccessible MC6X12 channel section qualifies without explicitly considering channel-substitution providing the member interaction is _less than or equal to 0.62 for axial and bending, and less than or equal to'0.79 for shear.

CONCLUSION: The potential member substitution creates no design adequacy concern for CTH-1-13197 l Furthermore, the '

member substitution criteria would have been considered

.in the final close-out review of the calculation before formal issue.

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TITLE: ~g ,

CABLE TRAY SYSTEM ANALYSIS AND QUALIFICATION CLOSE00T h NUMBER: PI-11 REVISION: 2 PAGE 33 OF 56 2.3.3 Member Substitutions This section is to be reviewed only if an MC6X12 or MC3X9 member is specified on a CTH drawing and is marked IA (inaccessible).

l Member substitutions are allowed by Gibbs and Hill Drawing i 2323-S-0901 (Reference 5) which states that one step heavier shape of the same size may be substituted for the specified member. After 9/21/82 the member substitution was also restricted to the same member series as defined by the AISC manual. Prior to 9/21/82, substitution of channels for misec111neous channels was allowed. Typically, this results l in a member with a greater capacity, however if a C6X13 was  !

substituted for an MC6X12, the capacity was actually lowered. In addition, Reference 5 allows substitution of MC3X7.1 for MC3X9 members. Qualification methods for inaccessible members which may have had these substitutions is described below.

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Oualification Anoroach a) For all inaccessible MC6X12 and MC3X9 members, a conservative check is first performed. Compare the member axial and bending stress interaction ratio and the shear stress interaction ratio to the following limits.

(Reference 3).

Member Size Allowable Interaction Ratio Arial and Bendina Shgar, MC6X12 .62 .79 MC3X9 .61 .63 If these limits are not exceeded, the inaccessible HC6X12 and MC3X9 members qu(11fy. -

b) If the member exceeds the limits in a), a more detailed i check is performed. Qualify the member for both MC6X12 '

and C6X13 section properties or both MC3X9 and MC3X7.1 and compare to allowable interaction ratios given in eference 10.

c) For MC6X12 members which fall due to the criteria in b),

determine if the support installation date was before 9/21/82. Send a Request for Information (RFI) to review the traveler package which identifies the date of the support installation. If the installation date is after 3/4 1

IM-P-007

-l A7TAOi4NT E Prel fmina ry Ff na 1 ,g,,,,,,

- l etJPPORT DATA SumlAAy I

sue ,0nT = (Ch.cx on. f ra I ch co1 =n >

j Restrai nt Tvom Gaametry 1 Transv erse ^ ^ 1. Cantil ever L ongi tudi,nal 2. Sraced Canf tlever l Mul ti direct 3. L-Frame Frame Memoor 4. I) Frame Single Tier

5. O Frame Milti-Tier l
6. Other  !

Overlap Support Yes @ 1 Support Caponents Thermol agged $ No N Loaded Tier Anchorage (Check all that apply) j 001IFICATION OATA I I

I. EleERS: Maxime Member Interaction: ON (Check One)

, Post, _, ,. Col an,1 Ti er, Member Ty pe __, Brace II. Maxima Capressive Ratio (fa/Fa) = #'#

Member Ty pe Post, Col an, 2 Tier, Brace, Other III. Maxime K1/r M*7 Maximum L/r D D' IV. )f,ELQ1: Maximm Weld Ratio a W*I d R*""i "*d =

' + = 056 Weld Size O-12S V. Maximm Base Angle /Pl ate Interaction O'N Put C if done by FI-07 Charts. l VI. Maxima embed plate interaction d /A .

VII. Ms Maxtom Bolt Interaction: O' Put C f f done by PI-07.

801 t Type i Hilt 1, Super Hilti, R1cheond Screr TUGCo - CPSES Unit 1 e

m mo 0210-040 **

O S ri rz)n % V 8, \%iy GL O cu no oh* I

,,, ,, un me, ,, MF GTN- /- / 3197 1 4/4

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