ML19344D198

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Responds to IE Info Notice 79-36.GE & Sargent & Lundy Will Investigate Computer Code Problem & Relation to Possible Significant Defects in Piping Stress Analysis
ML19344D198
Person / Time
Site: Clinton  Constellation icon.png
Issue date: 02/29/1980
From: Wuller G
ILLINOIS POWER CO.
To: Hartzman M
Office of Nuclear Reactor Regulation
References
IEIN-79-36, NUDOCS 8003110516
Download: ML19344D198 (1)


Text

U-0120 ILL/NOIS POWER COMPANY ~:. LO8-80(02-29)-9 500 SOUTH 27TH STREET, DECATUR, ILLINOIS 62525 February 29, 1980 Mr. Mark Hartzman Division of Systems Safety Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Hartzman:

Clinton Power Station Units 1 & 2 Docket Nos. 50-461 and 50-462 This letter confirms, per your request, the verbal information provided to you in two recent telephone discussions with Mr. J. H.

Shepard concerning a defect in the NUPIPE computer code used by industry in stress analyses of piping systems.

Mr. Shepard advised you that Illinois Power Company (IP) has used the NUPIPE code for some design verification of our architect-engineer's (Sargent & Lundy) piping stress aralysis. Previous to your first contact, IP had already evaluated the computer code defect conditions provided in the NRC IE Information Notice No. 79-36.

We found that the defected condition of a flexible joint modeled at the end of an elbow (ELBOW-ELAST0JT connection) did not apply or affect any IP stress analyses on Clinton Power Station Unit 1. In fact, Mr. Shepard had already communicated the code error to Control Data Corporation's Cybernet Center for necessary correction, even though IP had not used the ELBOW-ELAST0JT connection in its analyses.

Sargent & Lundy (S&L) had previously informed us that the NUPIPE b computer code is not used for the Clinton Power Station piping j analysis. The S&L proprietary computer code, PIPSYS, is used. Please ,

be advised that our NSSS vendor (General Electric Company) and l architect-engineer (S&L) have been requested to investigate the computer code problem identified in IE Information Notice 79-36 to determine its applicability to the Clinton Power Station. We will j inform you if any significant defects in the piping analyses are -

disclosed. ,

1 If you have any further questions regarding this matter, please contact me or Mr. Shepard.

Sincorely, G. E. Wuller

  • I J

Supervisor-Licensing GEW:dl cc: B. C.

Buckley (NRC Clinton Project Manage 5)o a ilo 9@

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