ML20215B166

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Rev 0 to Clarification of Impell Cth Design Verification Criteria/Methods for Resolution of Cygna Audit Concerns, Impact of Superpipe Error SP-004 on Evaluation 176-063-02
ML20215B166
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-001, IM-P-001-R00, IM-P-1, IM-P-1-R, NUDOCS 8706170243
Download: ML20215B166 (5)
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0 CLARIFICATION OF IMPELL CTH DESIGN VERIFICATION-CRITERIA / METHODS FOR RESOLUTION OF CYGNA AUDIT CONCERNS 1

Impact of SUPERPIPE Error SP-004 -

1 on Evaluation 176-063-02

'l Prepared for: 1 Texas Utilities Electric Company Prepared by:

Impe11 Corporation 0210-040/041 IM-P-001 Revision 0 Prepared by: d% g d3:5 g/fgfg j VU  !

Approved by: (( SVS-8 7 i ,

8706170243 870649 PDR ADOCK 050M445 A PDR

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CONCERN: Error in system analysis 176-063-02 (analyzed using SUPERPIPE Version 21A) regarding use of lumped weights and point forces.  ;

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BACKGROUND: Superpipe Error SP-004 identified an error in the use of 1 lumped weights for all Versions of the program except Version 21A. When lumped weights are input as-

' Directional Weights (Section H) and a static analysis is executed using the "GRAV" or "LUMW" load cards, Superpipe always selects the global X translational weight for the analysis, regardless of the specified gravity direction.

DISCUSSION: The error in Superpipe was identified in Impe11 Project .

l Instruction PI-02 (see attached excerpt) addressing the d analysis methods used for cable tray hanger systems.

Project Instructions specifically identified methods to correct the weight used in static analysis. Basically,  !

point forces were input to cancel the incorrect weight l selected by Superpipe and input the correct weight for  ;

the static analysis. For a dynamic analysis Superpipe selected the Directional Weights properly and no correction was required. This correction was necessary for cable tray systems analyzed using Superpipe versions other than Version 21A.

Analysis 176-063-02 used Superpipe Version 21A and, therefore, the corrections for the directional weight were not necessary. The evaluation of 176-063-02 did, l however, include these corrections. As a result, the gravity loads used for the analysis were larger than the true gravity load and the analysis was conservative.-

CONCLUSION:

Analysis 176-063-02 used a version of Superpipe in which error SP-004 was corrected. The analysis was run as though the error still existed. As a result, a conservative value was used for lumped weight in the gravity analysis. The evaluation did not result in excessively conservative results and, therefore, no corrective action is necessary.

The improper correction for Superpipe error SP-004 in a

, version of Superpipe which already corrected the error was identified through an internal Technical Quality Review, indicating that Impe11's Quality Assurance Program is performing its intended function.

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LSER IPFORMA?!ON .

COMPUTER PROGRAM USER NOTICE SUPERPIPE SP-004 PROGRAM: ggggggg VERSION (S) All Versions excluding 21A DATE < 9/15/86

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I DESCRIPTION When lumped weights are input as Directional Weights (Section H)  ;

and a static analysis is executed using the "GRAV" or "LUMW" load cards, SUPERPIPE t always selects the global X translational weight for the analysis, regardless of l the specified gravity direction. j 1

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Surf 1ARY OF AFFECTED OPERATIONS OR RESULTS THAT SHOULO l BE REVIEEOs  !

Any static analysis which uses "GRAV" or "LUMW" in conjunction with weights specified under the Directional Weight section, j

REC 0tt1EPCATIONS TO PROGRAM USERS: i When it is necessary for the User to perform a static analysis using "GRAV" or "LUMW" loads specified in X, Y, and Z direction, it is suggested that three separate analyses be executed using the PNTF option and combined appropriately.  !

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BY "!!b APPROVED ///'/"

PROGRAM ENGINEER 13 ATE . ' % MANAKR oATE L

CORRECTION OF PROBLEM (CORRECTED IN VERS 10N NO. - )*

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CORRECTED BYs l INIT!ALS/DATE CLOSED:

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rnoscT EnsincEn oATE ,A ,A,A,cR oAtc 3/5

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t TITI.E DYNAHIC ANALYSIS OF CABLE TRAY SYSTEMS L i. ' V "

NUMBER: PI-02 mm REVISION: 5 PAGE25 OF76 The use of directional weights to simulate the response of the omitted tray will result in the following tray weight distribution: ,

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+ier This weight distribution will be properly applied for dynamic load cases. However, for the gravity load case this weight distribution c will be interpreted by SUPERPIPE as follows:

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  • Wy["PPICed verlic.a.lIh SUPPerf-2 her .

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Where Nxc is the directional weight applied along the global x directicn. For the gravity load case, point forces must be applied [i in addition to achieve the proper weight distribution:

val +o Se, force b8 e jua.I fo g 4A %e po,;;.gye y WV g Me a;4;g fnVC Y di eeHon t

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I M 5E IM-P-001

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TITLEp DYNAMIC ANALYSIS OF CABLE TRAY SYSTEMS NUMBER: PI-02 REVISION: 5 PAGE 26 . OF 76 For longitudinal supports on trays skewed with respect to Global [

Coordinates, the procedure described @,the previous page is to be used with one exception. If NL is larger than H T WL is to be '3 applied in both the global x and z oirections.

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