View source for TXX-4404, Requests NRC Approval of Use of ASME Code Case N-397 & N-411 for Analysis of ASME Class 1,2 & 3 Piping.Application of Code Cases Provides Sufficient Levels of Conservatism to Assure Functionability Under Design Conditions

{{Adams
| number = ML20102B855
| issue date = 01/25/1985
| title = Requests NRC Approval of Use of ASME Code Case N-397 & N-411 for Analysis of ASME Class 1,2 & 3 Piping.Application of Code Cases Provides Sufficient Levels of Conservatism to Assure Functionability Under Design Conditions
| author name = Beck J
| author affiliation = TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
| addressee name = Denton H
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000445, 05000446
| license number = 
| contact person = 
| document report number = TXX-4404, NUDOCS 8503040453
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 1
| project = 
| stage = Other
}}

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(/l t Log # XX-4404 File # 905.4 TEXAS UTILITIES GENERATING COMPANY
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CK                                      January 25, 1985                               Td Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555

==SUBJECT:==
COMANCHE PEAK STEAM ELECTRIC STATION DOCKET NOS. 50-445 AND 50-446 CODE CASE USAGE

==Dear Mr. Denton:==

In accordance with 10CFR50.55a(a)(3) NRC approval is requested for the usage of ASME Code Cases N-397 and N-411 for the analysis of ASME Class 1, 2 and 3 piping at CPSES Units 1 and 2.
Code Case N-397 contains an alternative method to spectral broadening which is a more reasonable and realistic approach to piping analysis.
Code Case N-411 contains alternative damping factors that can be used in lieu of values contained in Section III, Division I, Table N-1230-1 of the ASE Code.      These damping values are more reasonable and realistic values to use in the seismic analysis of piping.
Applying these code cases to CPSES Units 1 and 2 piping analyses still provides sufficient levels of conservatism to assure functionability under the design conditions.
Should you have additional questions in this matter, please contact this office.
Respec tfully, W w.%-
ohn W. Beck BSD/grr c- J. J. Stefano 8503040453 850125
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