ML20237K755

Summary of 870625 Meeting W/Ebasco in State of Ny Re Conduit Support Design Review & Ebasco Audit - Program Review. General Flowchart & Related Diagrams Encl

ML20237K755
Person / Time
Site:	Comanche Peak
Issue date:	06/25/1987
From:	Williams N CYGNA ENERGY SERVICES
To:	CYGNA ENERGY SERVICES
References
NUDOCS 8709080005
Download: ML20237K755 (9)

Text

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. Communications

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Report 0* P"" E Telecon Conference Report g

Project- Job No.

TV Electric 84056 CPSES IAP Phase 4 oate:

6/25/87 Subsect- Time:

Conduit Support Design Review 3:01 p.m.

Ebasco Audit - Program Overview Ebasco (NY)

Participants- og l

R. Alexandro. J. Kuo. N. Tassoulas. K. Wu Ebasco D. Leona. B. Shakibnia Cygna l Required -

Item Comments Action By l

Ebasco presented Cygna with an overview of the conduit ,

support reverification program. Flowcharts of the l' reverification processes were provided and are provided as Attachments 1 through 5 to this communications report.

Attachment I shows the general flowchart for the entire program, including the appropriate design documents. The

- purpose of the program is: (1) to reverify the original S-0910 package or to modify .it as required, using various  ;

design criteria (SAG.CP10, 21, 17, 29, and 20) and (2) to i assure that the installed conduit systems are within the l bounds of the verified S-0910 package, using the ISO verification guidelines SAG.CP25. One exception was noted: the cable spread room frame was design verified on a case-by-case basis, using as-built information instead ,

of the original S-0910 design drawings.

Attachment 2 shows the areas included in the design verification of the original S-0910 package. These areas include span verification, support design verification, and junctiot. box verification. A thermal study was done to set generic criteria for anchor bolts.

8709000005 870909 PDR ADOCK 05000445 A PDR 1 3 signeo See At,tached Distribution Sheet. Page of

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=r Communications AM' M Report ll111111111!!11111111111111111 Requued I ltem Comments Action By j l

Because the project schedule was tight, it was necessary to determine approximate design accelerations such that the span verification and support verification tasks could proceed concurrently. The approximate design ,

accelerations used in the support verification effort were i later checked against the final design accelerations determined in the span verification effort. Additionally,

! CQC combination of modes was originally used; load factors were developed later to consider the required Reg. Guide i 1.92 modal combination. This was also included in the final check of design accelerations.

1 The results of the span verification, support verification, junction box verification, and. thermal studies were incorporated into either the revised S-0910 package, the design criteria, or 'the ISO verification ,

criteria. The thermal study produced a set of criteria j which must be met in the installed system configurations  !

or must be considered on a case-by-case basis, l

Attachment 3 goes into further detail on' the span l verification process. Except for CA-type s'upports in large diameter LA-spans, all other supports and spans are considered to be flexible. Design accelerations (not zero-period accelerations (ZPA)) are used in the verification.

Ebasco explained that, early on in the design verification process, it was determined that, because of the lack of dynamic amplification factors (DAF) and other deficiencies in the Gibbs & Hill designs, the generic supports could ,

not be qualified for the original design accelerations.

It was therefore necessary to reduce the design' accelerations by choosing a target acceleration and setting a minimum support frequency. As shown in Attachment 2, a prewalkdown to identify supports having frequencies below the minimum was to be performed but was later discontinued because of the 100% as-built program.

Page of See Attached Distribution Sheet.

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e=_ Communications 3TD== 3 Report 1111111111ll1111!I111111111111 Reauwed Comments ' Action By item Selected conduit sizes and configurations were chosen for

,_ analysis. The orientation of the conduit runs with respect to the three global directions was varied.

Analytical results were compared to confirm the judgment used in selecting the analytical configurations. Final.

design accelerations and load factors (for Reg. Guide 1.92 modal combination) were obtained.

Attachment 4 presents the process used in the design verification of the generic supports. Ebasco explained that allowable support' loads were determined for each support orientation, building, and elevation to more easily. qualify supports in th'e Iso verification process.

Transverse supports were eliminated from the verification process, as they are to be removed or replaced in the pl ant.

Attachment 5 presents the ISO verification process. The site walkdown information is used to generate isomotrics j

j. of the conduit systems. As-built drawings of each support are also ger.erated. The isometrics and support drawings are used to verify the span lengths and support capacities using the revised S-0910 package. Support capacities are j.

first compared. If the support' fails, further support {

analyses using the specific support configuration may be i done, or RSM analyses may be done to reduce the loads on the support.

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DISTRIBUTION LIST Mr. J. Redding' Mr. L. Nace Mr. W. Counsil 3 i

Mr. D, Pigott Ms. A. Vietti-Cook MrECl! Grimes;b j Mr. E. Siskin Ms. N. Williams Mr. J. Russ Mr. W. Horstman Mr. K. Parikh Mr. B. Atalay Ms. D. Leong Mr. B. Shakibinia l Project File l l

I 1

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