ML20210L516

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Rev 1 to Procedure for Grouping Cable Tray Hangers for Comanche Peak Steam Electric Station Units 1 & 2
ML20210L516
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 12/13/1985
From: Fong D
EBASCO SERVICES, INC.
To:
Shared Package
ML20210E291 List:
References
PROC-851213, NUDOCS 8702120435
Download: ML20210L516 (16)
v • d • e


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EBASCO SERVICES-INCORPORATED PROCEDURE FOR-GROUPING CABLE TRAY HANGERS FOR.

COMANCHE PEAK STEAM ELECTRIC STATION NOS.1 AND 2

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Prepared Reviewed / Approved Pages Revision By By Date Affected R0 D Fong R Alexandru 8/30/85 R1 D Fong R Ale 12/13/85 i, 1,2,4, Al-1,.

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! TABLE OF CONTENTS

- . Page 1.0 Purpose 1

., 2.0 Scope 1

. 3.0 References 1 4.0 Responsibility 1 5.0 Procedure for Freparation of Grouping Documentation Package 2 6.0 General Guidelines for Grouping 3 i 7.0 Specific Considerations on Grouping for Fach CTH 4 i General Category.

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8.0 Records 8 ATTACHMENTS '

) Al-1 Evaluation Sheet R1 1

1 Al-2 Evaluation Sheet R1

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A2 Tabulation Sheet' A3 Form 581

A4 Cable Tray Hangers Form i

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1.0 Purpose O- The purpose of this procedure is to describe the method and guidelines used in grouping cable tray hangers (CTHs) for design verification.

2.0. Scope All CTHs entered into the computerized CTH geometry data base in the Auxiliary Building and Safeguard Buildings shall be grouped except as noted below. See Reference. 3.1 for a description of the geometry classification code used to form the computerized CIH geometry data base. Only small. trapeze CTHs in the Unit 2 Reactor Building will be grouped. Design and Install (D&I) CTHs will not be grouped. CIHs.with the geometty classification symbol " SPEC" have unique geometries and thus -

cannot be grouped. All CTHs of Unit 1 shall be grouped for all buildings R1 except for those in .the Safeguard Buildings.

3.0 Re ferences

.1 Memo SAG TUG 2.1191 " Cable Tray Hanger Geometry Classfication Code" dated August 20, 1935.

.2 SAG CP3 " Seismic Design Criteria for Cable Tray Hangers for Comanche Peak Steam Electric Station No. 2", latest revision.

.3 General Instructions for Cable Tray Hanger Analysis,_ latest revision.

4.0 Responsibility

.1 This procedure will be maintained by Civil Engineering in the New '

York Office, and approved by the Lead Discipline Engineer / Supervisor.

.2 The Grouping Team Leader is responsible for assigning and maintaining a log of all assigned group numbers.

.3 The Grouping Team Leader is responsible for updating the computerized CIH data base for grouped CIHs.

.4 The Grouping Team Irader is responsible for assigning grouping tasks.

.5 The Grouping Team Icader is responsible for maintaining a Grouping File containing originals of the grouping evaluation, logic, and tabulation sheets for each CIH group.

.6 The Design Supervising Engineer is responsible for design verification of each CIH. group. He is also responsible for advising the Grouping Team Leader if a CIH group requires subgrouping due to results of the group design verification. .He is also responsible for R1 advising the Grouping Team leader if there is a major revision to a grouped CIH which would affect its' grouping.

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t 5.0 Procedure for Preparation of Grouping Documentation Package R

, y) The following steps shall be followed'in preparing a Grouping Document -

Packade.

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! .1 From the computerized data base, obtain drawing numbers of all CTHs with identical geometry classification symbol.

2 Subdivide the CTHs obtained in 5.1 by close geometry dimensions.

This is done using the height and width dimensions which are two of the primary design parameters used in the design verification of

CTHs. The CTHs should be subdivided using one foot intervals in the
height and . width for ease of grouping.
.3 Fill in the design data required on the tabulation sheet, Attachment -

A2, leaving the group number. space blank. Sign and date Attachment A2 as per Engineering Procedure E-30

4 Evaluate the CTH design parameters of a possible geometry group on-t the completed tabulation sheets and select the representative case.

During this evaluation process, the Group Team Member shall provide the logic (justification) behind the selection of the representative case on Ebasco Form 581, Attachment A3. Sign and date Attachment.A3-as per Engineering Procedure E-30

.5 Fill in, sign and date the evaluation sheet, Attachment Al-1 (using R1

Unit 1 representative case) or Attachment Al-2 (using Unit 2 representative case), leaving the group number space -blank.

! .6 Fill in Attachment A4, " Cable Tray Hangers", except for th'e Group No.

, column. ,

.7 Assemble Group Documentation Package,' Attachments Al-1 or Al-2 to A4, R1 and give to Group Team Leader for assignment to another Grouping Team l

Member for checking as per Engineering Procedure E-30 .

.8 Af ter checking, Grouping Team Leader shall sign and log out a group number. This group number shall be placed on Attachments Al-1 or Al-2, A2 and A4 lR1

.9 A copy of Attachments Al-1 or Al-2 and A2 along with a print (Unit 2) R1 i or red line drawing (Unit 1) of each CTH in the group shall be sent

by the Grouping Team Leader via memo to the Design Supervising .

Engineer Zor design verification.

.10 The Grouping Team Leader shall file the originals of the Group -

Documentation Package (Attachments Al-1 or Al-2 to A3) in the R1 Grouping File, part of Volume I of calculations for each unit.

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6.0 General Guidelines for Grouping O

t V .1 Group CTHs with identical geometry classification symbols.

.2 Prior to grouping, determine the function of the CTHs with identical geometry classification symbols, i.e. , transverse, longitudinal or multidirectional. See Reference 3.3 for identification of CTH function. Group only CTHs serving the same function.

.3 It is preferable to group CTHs with as close as possible geometh dimensions (height and width). CIHs with'the same geometry classification symbol should first be subdivided by height and width

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dimensions using one foot intervals.

.4 CIHs with identical geometry classification symbols and similar dimensions should be further subdivided by loading. This is done in order not to be overly conservative on the design verification of the support anchorage.

.5 It is preferable to group CTHs with the same member sizes. When '

grouping CIHs with different member sizes, compare the key stress ratios on the logic sheet, Attachment A3.

.6 It is preferable to group CIHs in the same building and at the same building elevation. Grouping of CTHs in different buildings and/or at different elevations requires a comparison of seismic "g" values based on the total system frequency of the CTH to edure that the -

y selected representative case envelopes the other CTHs.

.7 In selecting the representative case, first preference should be given to selecting an actual CIH from the prospective group. If this is not possible, compose an " idealized CIH" as the representative case from the enveloping design parameters of the prospective group of CTHs.

.8 If only the floor elevation and room number are specified on the lower lef t hand corner of the design drawing and the exact CIH mounting elevation is not known, use the next higher building floor elevation in recommending the floor response spectra.

.9 It is preferable to group CTHs with similar anchorages to ensure similar stress distribution throughout the CTH support members.

.10 For CTHs with tier width greater than 2'-0, note location of the tray supported on the tier. This could affect the selection of the representative case, i

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.11 All efforts shall be made to incorporate new incoming CTHs into existing groups. _ _

.12 If a new CTH can be placed into an existing group, a revision to the

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Grouping Documentation Package shall be made.

.13 Any CIH which cannot be grouped shall be brought to the Grouping Team Leader for review. Af ter review and concurrence, the Grouping Team' leader shall t.ransmit the CIH to the Design Supervising Engineer for -

design verification.

.14 CTHs supporting temporary conduits shall be grouped. CTHs supporting permanent conduits shall be brought to the Grouping Team leader for review. These CTH chould not be grouped unless the conduit dead . load is small and the Grouping Team leader's cencurrence is obtained.

.15 Due to the nature of the as-built verification work, there is usually R1 no need to consider minor subsequent revisions to the grouped CTHs.

If- there is a major subsequent revision (such as large changes in CTH geometry, load, etc.) to a grouped CTH which affect its grouping, the Design Supervising Engineer or designee shall advise the Grouping Team Leader so the appropriate action can be taken to ensure the correctness of the affected existing group.

7.0 Specific Considerations on Grouping for Each CTH General Category

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The geometry classification code divides CTHs into seven general O categories. These are described in detail in Reference 3.1 listed below.

Catego ry Symbol

, Trapeze Hangers U

= L Shaped Hangers L Beams (supported at both ends) BEAM Cantilever Beams CANT Triangle Types TRIA Direct Wall Mounted Types WAIL Special Types SPEC Each CTH general category has specific considerations in their grouping.

These are described below.

.1 TPAPEZE HANGERS A. Transverse and Multidirectional CIHs These CIHs shall be subdivided into small trapezes (vith height 5 5.5 feet) and large trapezes (with height > 5.5 feet) for ease of grouping.

1) Small Trapezes (Ceiling or Floor Mounted)

Grouping of these CIHs are straightforward. Follow general O guidelines in Section 6.0.

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ii) Iarge Trapezes (Ceiling or Floor Mounted)

C' a - The CIH post member usually exceeds the k1Ir requirement and require longitudinal bracing. -

Therefore make the assumption that longitudinal (out-of plane) bracing exists at five feet intervals starting at five feet from the anchorages. Note this assumption on the tabulation sheet, Attachment A2.

b - Large trapezes normally support two or more cable trays. The locat3on of the- various tier members (loaded and unloaded) and the location of inplane bracing member (s) have a significant effect on the transverse direction CTH frequency which ultimately affect the loading. . This must be considered when selected the representative case.

c - Other general guidelines are covered in Section _6.0.

iii) Wall Mounted Unbraced Trapezes With Geometry Classification Symbol UW a - These CIHs are predominantly single tier member hangers with f riction clamps holding the cable tray in place.

l These CIHs function as transverse supports. Besides l

the cable tray load, the other. primary _ design parameter is the height dimension. This is especially true for heights greater than 3 feet. The larger the height dimension, the lower the vertical CTH support frequency and the higher the seismic loads and the resulting

reaction loads on the anchorages. .

Do not group UW CIHs having a single beam tier member having a CIHs having a composite channel tier (with friction clamps).

b - UW CIHs with a composite channel tier member supporting l a horizontal tray with heavy duty clamps function aa longitudinal supports. Besides the cable tray dead load, three of the most important parameters to review l in selecting the representative case are the height i dimension, thermal load and longJtudinal tray weight.

Actual longitudinal tray tributary span should be used I when available for calculation of longitudinal tray weight. If the actual longitudinal tray tributary span is not available, assume a longitudinal tray tributary l span of either 40 feet, 20 feet plus "A" dimension, or 20 feet plus length of cable tray one feet from wall / column. See diagrams below in selecting the proper assumed span length.

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i CABLE TitAYYk ccNt W Ai.t cit, c Nc - ceta

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.R = 20' + b eM " A " l*20'+(H~l') }' Ao' f.= Assusan LonstruciNAt. TRAY TRtBdTARY SPAN 3LAR VIEW c - Other general guidelines are covered in Section 6.0.

iv) Wall Mounted Braced Trapezes With Geometry Classification Symbol UBW -

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(,)/ a - These CTHs are predominantly single tier hangers with a composite channel tier with bracing and heavy duty clamps holding a horizontal tray in place. These CTHs

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function as longitudinal supports. The predominant loads in the design verification of these hangers are -

the longitudinal tray weight, thermal load and the transverse tray weight for heights greater than 3 feet. See 7.lili)b above for discussion on the

. determination of longitudinal tray weight.

b - Other general guidelines are covered in Section 6.0.

B. Longitudinal Trapezes (UL or UBL) i) The predominant loads in the design verification of these CTHs are the longitudinal tray weights and the thermal loads. Actual longitudinal tray tributary span shall be used in the longitudinal tray weight calculation.

ii) Do not group longitudinal CTHs with (geometry classification symbol UBL) and without (geometry classification symbol UL) out-of plane bracing.

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. iii) For longitudinal CTHs with out-of plane bracing, note the location and slope of the bracing. For a prospective

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group, they should be similar to ensure similar member stresses, iv) Other general guidelines are covered in Section 6.0.

.2 TRIANGLES (TRIA)

A. Triangles are predominantly longitudinal supports holding horizontally running cable tray (s). The predominant loads in the design verification are the longitudinal tray weight, the thermal load and the vertical transverse weight for large widths.

B. Note the location and slope of the brace member. For a prospective group, they should be similar to ensure similar member stresses.

C. For calculation of longitudinal tray weight, use the actual longitudinal tray tributary span when available. If not available, assume a length of 40'-0.

D. The position of the cable tray on the hanger is important in the selection of the representative case.

E. Other general guidelines are covered in Section 6.0.

.3 CANTILEVER BEAMS (CANT)

J A. Cantilevers are normally transverse or multidirectional supports. The predominant load in the design verification .is the tray dead load. - -

B. The position of the tray on the hanger is very important in the design verification of the anchorage and in the selection of the ,

representative case.

C. Do not group cantilevers welded to embedded plates with cantilevers welded to an anchorage angle expansion anchored into the concrete beam or wall. Cantilevers welded to embedded plates have large warping stresses.

D. Other general guidelines are covered in Section 6.0.

.4 L, BEAM AND WALL TYPE CTHs Grouping of these CTHs are straightforward. Follow the general guidelines in Section 6.0.

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8.0 Records

.1 The New York Office Civil Engineering shall be responsible for maintaining complete files as listed below for the duration of the project:-

A. Originals of each Group Documentation Package filed in the Grouping File, part of Volume I of the calculations for each unit.

B. Log of all assigned group numbers.

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EBASCO SERYKE5 mCORPORATED . Attactraent Al-1 R1

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. e., = c0 peo,s e, C0MANCE PIAK EPS UNIT No. 2 or UNIT NO. I avanct CTE GROL7ING Esasons for calculating one representative hanger of the group .

The group consisting of supports has been reviewed for:

1. hanger height and width
2. support member sectional properties
3. total load
4. tray span (s)
5. support location and by inspection, the __ haeger was found to e telope all the other supperts.

1 Ter details cf groupit;, see Tclu=e 1, Bect 4 or Book 8.

1 The grou; cc:sists of the fcileving supperts:

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P.EP R5 S ENTATIVE CASE 870 9/40f36-o/ 'i ,

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'Q curwr TUGCO PROJECT COMANCHE PEAK NPS UNIT NO.1 su a;scT CTH GROUPING

. Reason.s for calculating one representative. hanger of. the group .

The group consisting of supports has been reviewed for:

.l . hanger height and width. .

._ 2. support member sectional properties _ .

.. ... . . . .. 3. total.. load.._, . _ . . _ _ , . . . __ . .

. _ . . 4. tray. span (s) .. . .. ._ __ ., . . ._ . . . . . .

5. support location . . . . . . .

and by inspection, the

  • hanger was found to envelope all the other supports. Use response spectra for El. .

O' \ For details of grouping, see Volume I, Book 8.

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  • For static calculations, use Unit 2 CTH-2 . as: representative. case.

The group consists of the following supports: ,. .

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EBASCO SERVICES INCORPORATED Attachm:nt A3 4

-d BY DATE SHEET OF

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CHND.BY DATE OF5 NO. NO.

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