ML19260D707

Responds to Telcon Re IE Info Notice 79-36 Concerning Use of Nupipe Computer Program in Piping Sys Analysis.Problem Discussed in Notice Does Not Apply.Supporting Documentation Encl

ML19260D707
Person / Time
Site:	LaSalle, Zimmer
Issue date:	02/04/1980
From:	Kuhlman G SARGENT & LUNDY, INC.
To:	Hartzman M NRC - SEISMIC REVIEW GROUP
References
IEB-79-36, IEIN-79-36, NUDOCS 8002110627
Download: ML19260D707 (8)

Text

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SAItoux r & LrNny ENGINEERS rou%ota av ratOta'cn sanotsv sesi 55 EAST MONROE ST AEET CHICAGO,f LLINOIS 60603 paarwan ?tLEawcNE -

r2-269-2 COO U2-269 J75a OA SLE ACORES S - S A ALU N -C H4 C A G O February 4, 1980 The Cincinnati Gas & Electric Company Wm. H. Zimmer Station - Unit 1 Commonwealth Edison Company La Salle County Station - Units 1 and 2 NUPIPE Mr. Mark Hartzman 3 f 1,0 '2 Seism 1'. Review Group l q 'g-Division of Operating Reactors Nuclear Regulatory Commission (NRC)

Washington, D. C. 20555

Dear Mr. Hart:

man:

It is my understanding that you recently contacted our Mr. C. F. Beck by telephone, and asked whether Sargent &

Lundy has used the NUPIPE Computer Program in the analysis of any piping systems on our projects. It is my understanding that Mr. Beck explained to you that we had hired Nuclear Services Corporation to perform some pipe analysis work on both the Zimmer - Unit 1 and La Salle - Units 1 and 2 generating stations. It is also my understanding that we explained to you that to the best of our understanding, all of the work on Zimmer and La Salle was on non-safety-related systems.

The reason for your asking the question was, to the best of my understanding, related to the recent problems brought forth in the NRC IE Information Notice No. 79-36, which was distributed on January 2, 1980.

I am enclosing a copy of a letter dated January 28, 1980 from Mr. R. H. Dempsey of Nuclear Services Corporation in response to a letter that I sent to Mr. Naymark of Quadrex Corporation dated January 24, 1980 on this subject.

I am also enclosing a copy of my l9tter to Mr. Naymark and the attachments which were enclosed with that letter, for your information, g ti

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SARGENT & LUNDY ENGINEERS CHIC AGO Mr. Mark Hartzman February 4, 1980 Nuclear Regulatory Commission Page 2 Based upon a review of the Nuclear Services Corporation letter dated January 28, 1980, Sargent & Lundy has concluded that the problem that was brought forth in NRC IE Information Notice No. 79-36 did not exist on any of the work performed by Nuclear Services Corporation in either of the Zimmer or La Salle projects.

I will assume the information provided you with this letter will satisfactorily alleviate the concerns that you raised in your conversation with Mr. Beck.

Yours very truly, G. C. Kuhlman Project Director GCK:cim In duplicate Enclosure Copies:

W. A. Chittenden (1/l)

W. G. Hegener (1/l)

R. J. Mazza (1/1)

R. F. Scheibel (1/l)

C. F. Beck (1/l)

E. B. Branch (1/1) 4oeJ

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fpDUCLC7R 9 SERVIC3S CORPDRATIOD k J 1700 DELL AVINUE CAMPBELL. CALIFORNIA 95008 TELEPHONE t408) 44-2500 Twt 910-596 2438 4 DivlS1C4 08 OLIADREX CO APO A ATION January 28, 1980 Mr. G. C. Kuhlman Sargent & Lundy 55 East Monroe Street Chicago, Ill 60603

Subject:

Zimmer and LaSalle Projects - NUPIPE ELAST0J0 INT Problem

Reference:

1) Letter from G. C. Kuhlman (Sargent & Lundy) to S. N. Naymark (Quadrex) dated January 24, 1980

2) Letter from it. D. Barentsen (CDC) to C. Beck (Sargent & Lundy) dated January 16, 1980

3) Letter from S. fl. Naymark (Quadrex) to R. Detersen (CDC) dated December 19, 1979

Dear Mr. Kuhlman:

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Per your request, Reference 1, we have reviewed our records of the pipe stress analyses performed by Nuclear Services Corporation for the Dn. H. f Zimmer Station - Unit 1 and LaSalle County Station - Units 1 and 2 (P.O. #CD-3021).  !

The results of this review indicate that the four conditions, which are necessary in order for the problem to arise, do not exist. Hence, the flaw described in References 1 through 3 does not exist in any of the analyses which we have performed for Sargent & Lundy.

I hope that this response satisfies your concerns in this matter. If you have any questions, please feel free to contact me.

Yours truly,

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Senior Vice President Operations and Projects RHD/bd

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TELapwoNC = 312-269-2000 3t3 3e9 3758 CAeLE ADDRESS - S ARLUM* CHICAGO January 24, 1980  ;

The Cincinnati Gas & Electric Company Wm. H. Zimmer Station - Unit 1 -

Commonwealth Edison Company La Salle County Station - Units 1 and 2 NUPIPE Mr. Sherman Naymark President Quadrex Corporation 1700 Dell Avenue Campbell, California 95008

Dear Mr. Naymark:

Qurdrsx Corporation has in the past, and is presently performing piping weight, thermal and seismic analysis under contract to Sargent & Lundy on the Zimmer project for The Cincinnati Gas &

Electric Company and the La Salle project for Commonwealth Edison Company. Since this activity has, and presently is being performed by your organization, it is necessary to have you provide us an assessment of the recent occurrences that have been brought forth in various documents regarding the use of the NUPIPE computer program that it is our under-standing you have used in these activities.

Sargent & Lundy has received a letter from Control Data Corporation dated January 16, 1980, appended to which is a letter from you to Control Data Corporation dated December 19, 1979, pertaining to the fact that an NRC 10CFR21 has been filed relating to some technical problems relating to the NUPIPE computer program.

These letters are, likewise, directly cal a t'_d to a recent NRC IE Information Notice No. 79-36 that was distributed on January 2, 1980.

We, therefore, recuire that Quadrex provide Sargent & Lundy ,

with written information to verify the following:

10A1J 2nr Determine if any safety-related systems were analyzed i/ JU3 1.

by Quadrex nn the Zimmer and La Salle projects where the problem, as outlined with the NUPIPE system, could ~ -~

have caused possible flaws in the output data from the analysis. If this has occurred on any of the analysis

SARGENT & LUNDY I ENGINEERS CHICAGO

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Mr. Sherman Naymark January 24, 1980 Q 1adrex Corporation- Page 2 work performed on these projects, it will be necessary for Quadrex to verify to Sargent & Lundy that they have taken the appropriate corrective action on such analysis to verify acceptability or the need for any changes to the design output information that you have developed.

2. Determine whether any analysis was performed on any non-safety-related systems. We will require confirmar'an from you that either will state that the problem with the NUPIPE computer code does not apply to systems analyzed, or that you have taken the necessary corrective action to verify that the design must be either corrective or is acceptable.

If you have any questions on the above, please contact me.

We will be looking forward to a response to this letter at your earliest convenience.

Yours very truly, a

e ...t - m G. C. Kuhlman Project Director GCK;cim In duplicate Attachments Copies; W. A. Chittenden (1/0)

W. G. Hegener (1/1)

R. J, Mazza (1/1)

R. F, Scheibel (1/1)

C, F, Beck (1/0)

E, B. Branch (1/1)

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. CONTROL DATA CORPOR6 TION January 16, 1980 Mr. Charles Beck .

Sargent and Lundy Engineers 55 East Monroe Street Chicago, IL 60603

Dear Mr. Beck:

In accordance with the provisions of the NRC's 10CFR21, Control Data Corporation would like to inform you that an error has been detected in the current version of NUPIPE available on the CYBERNET network.

• The error affects the calculation of stresses in piping systems. Specifically, the error would affect safety related piping designed to the ANSI B31.1.0 - 1976 code and where an 8

ELBOW-ELASTOJT connection exists. A complete description of

! the problem can be found in the attached letter from the Quadrex Corporation.

As mentioned in the letter, the error should be corrected in mid-January at which time Control Data Corporation will I re-install NUPIPE on the CYBERNET network. Should you have any questions or comments concerning this matter, please contact me at 612/853-6327.

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! Sincerely, CONTROL DATA CORPORATION I

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D. Barentsen, Manager

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Applications Quality Control COMSOURCE t

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. December 19, 1979 i

Mr. Ron Petersen Manager, '<!estern Region PS-SES ~

Control Data Cercoration -

215 Moffett Park Drive SVAFAC Sunnyvale, CA 94036

Dear Mr. Petersen:

As.of Monday, December 17, 1979, Quadrex Corcoratica has informed the Director, Office of Inspection and Enfercement, t'uclear Regulatory Comission, of a defect in a ccmcuter ccde used to calculate stresses in piping systems. This action.is in ccepliance The with the Code of defect '.culd only occur fer Federal Regulations, Title 10-Part 21.

those pcwer plants where safety-related piping wn designed to tne ANSI B31.1.0 - 1976 Code and v.here an ELEC'.l-ELAST0JT* connection exis NUPIPE is a proprietary computer program which is used to calculate stresses in piping systems to determine the location and type of oipe hanger necessary to suppcrt and restrain piping. The conditions for which NUPIPE is used include ASME service level A, B, C and D loadings, including the design base seismic event. Althcugn all piping c:ments, forces, deflecting and pipe restraint reaction loads calculated by NUPIPE are correct, the stress calculation of an ELS0W to ELAST0JT boundary element is incorrect. The NUPIPE prcgran can calculate an

' incorrect stress only when all the following conditions exist:

I o An ANSI B31.1.0 - 1967 Code version analysis is being conducted, I

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i o an. ELB0'd-ELAST0JT connection exists, and .

o an abso' lute sum (MODFLEX combination) of two load cases is being -

forced, and ,

o the elbow toisional coment axis does not align with the ELAST0JT -

local x-axis. -

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• An ELAST0JT eier.ent is an infrequently used element in the NUPIPE Code used to connect two piping node points with user supplied stiffness values. y, _ .

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The only incorrect values in the flUPIPE output, due to this defect, Depending on are the stresses at the ELE 03-ELAST0JT connecting nede.

the ' exact case, the correct stress may 1;e lower or higher than the computed stress. It is unlikely, however, that a highly stressed location in which the correct stress v.ould be significantly higher than the calculated stress, would have escaped attention since the stresses at the opposite (non-ELAST0JT) end of the elbcw are computed correctly

- by NUPIPE.

You should carefully review the NUPIPE has been issued since mid-1972.

work perfcmed that has included fiUPIPE analysis. The review should first determine if the four conditions described above do actually exist. If all fcur conditions do exist, the stresses at the ELEC'J- Cepending en the

- ELAST0JT connecting node cust be hand recalculated.

magnitude between the correct stress and the previously calculated

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stress, and the reanalysis of piping system:

o The differences cay be negligible and no further action is requii ed, o Additional pipe hangers may be required at piping in the vicinity of the ELS0W-ELAST0JT boundary.

o The present pipe hangers in the vicinity of the ELE 02-ELAST0]T boundary may require codification to lcwer the pipe stresses so that Code allowables are not exceeded.

o For power plants that have been operating and the difference in the correct and calculated values are large, the effect en the design fatigue life will have to be considered.

The NUPIPE program is presently being mcdified to eliminate the defect and will be reissued as '!ersion 1.4 in mid-January 1950.

9 Quadrcx Corporation will continue to ;c unicate to you any events which k c a direct bearing on the defect i;UPIPE or the ramifications of that u fece.

19/J 309 .

Very truly your

' r - M _ ,W ,

Mcan itay= ark, Presic nt

• , Quadrex Corporation y ., SES TCSD n

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