ML19241A821
| ML19241A821 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 06/06/1979 |
| From: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 7907090425 | |
| Download: ML19241A821 (3) | |
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THE CINCINNATI GAS & ELECTRIC C OM PANY cri-CINCINN ATt OHIO 4 5 2Or
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June 6,1979 J..^.."J7?.".'.71.
U.S. Regulatory Comission Office of Inspection and Enforcement Regiqh III 7999 Roosevelt Road Glen Ellyn, Illinois 60137 ATTN:
Mr. James G. Keppler Regional Director RE:
WM. H. ZIMMER NUCLEAR POWER STATION - UNIT 1 IE BULLETIN 79-07, DOCKET 50-358 W.0. 57300, JOB E-5590, FILE
- 91 Gentlemen:
By our letter to your office dated May 25, 1979 we proviced a response con-cerning IE Bulletin 79-07 which was complete insoftr as the Balance of Plant Piping is concerned. We subsequently have received a letter from the General Electric Company covering the seismic stress analysis for the NSSS Systems.
Therefore, by information contained herein, we are supplementing our letter of May 25, 1979.
In response to Items 1, 2, and 4 of the referenced IE bulletin G.E. has responded as follows.
"None of the computer codes used for the seismic analysis of GE piping systems, important to safety, employed the techniques identified in Itcm 1 of the subject bulletin."
The General Electric response to Item 3 of the referenced IE Bulletin, as it applies to the Main Steam Analysis, dated 12-29-76, and the Recirculation System Analysis, dated 12-4-74, is provided in Attachment "A" to this letter.
G.E. has in-dicated that the due date for submittal of the five (5) benchmark problems has been extended to July 31, 1979 in accordance with Mr. W.T. Russell (NRC Staff ) by tele-conference on May 25, 1979.
Submittal of the five NRC benchmark problems will con-clude CG&E's response to IE Bulletin NO. 79-07.
Very truly yours,
THE CINCINNATI GAS & ELECTRIC COMPANY E.A.BORGMANN,SENIO}RVICEPRESIDENT me DJF/kjd ENCLOSURE a 1 1 1979 cc:
W.D. Waymire R.F. Scheibel J.D. Flynn H.C. Brinkmann W.W. Schwiers W.E. Smith S.G. Salay NRC Office of Inspection and Enforcerent J.R. Schott Division of Reactor Inspection Progra:ns Washington, D.C. 20555 9
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The SAP /PISYS computer programs were used for seismic piping analysis perfomed by GE.
A description of these programs and tne verification procedure is presented below.
SAP 4G Verification Drocram Descriction SAP 4G, a version of SAP, was originally developed for General Electric by F. A. Peterson and K. J. Bathe of the Engineering Analysis Corporatien at Berkeley.
The SAP program is a general purpose structure program used to perform static and dynamic analysis of mechanical and piping components by the finite element method.
Verification All GE productions versions of SAP are verified using a special benchmark problem that exercises all the important features of the The benchmark problem has been analyzed for the effects program.
of constraint of free end, distributed forces, and is dynamically analy:ed to detemine mode shapes and natural frequencies using Swanson System's ANSYS program.
ANSYS was also used to predict dynamic response of the benchmark problem using the response spectra and time history integration methods.
The predicted frequencies, mode shapes, and loads were compared to the corresponding SAP predictions.
The SAP program prediction had to be consistent with those of ANSYS before SAP was qualified for production use.
In orde to test unique features of SAP that cannot be compared to the results of anotner program, a special problem is devised which has an equivalent camouter or manually calculated solution.
Before any new version of SAP is verified, for production application, the benchmark pr0blem is reanalyzed to verify that the program changes have not changed predictions or reduced their accuracy.
PISYS Verification Procram Descriotion PISYS is a computer program specializing to analyze piping systems.
The PISYS program provides a highly flexible user oriented input format for piping system modeling.
The analysis modules of PISYS are taken directly from the SAP 4G program.
Veri fica tien Since PISYS analysis modules are identical to SAP 4G, a SAP analysis of a typical BWR steam piping system is used as a benchmark problem for PISYS verification.
The steam line is analy:ed for thermal expansion, dead weight, and a variety of dynamic loads in orcer to exercise all the features of PISYS.
PISYS was not verified as a production program until the predictions of SAP ard PISYS were shown to be identical for practical purooses.
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ATTACHMENT "A" PAGE-2 Before any new versjon of PISYS is verified for production application, the bencnmark problem is reanalyzed to verify that the program cnanges have not changed the predictions or reduced their accuracy.
Five NRC benchmark problens will also. be analyzed as a furtner verification of the PISYS' code.
This analysis is expectec to be completed and submitted to the Cormission for review by July 13, 1979.
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