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
| ML20102B855 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/25/1985 |
| From: | Beck J TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| TXX-4404, NUDOCS 8503040453 | |
| Download: ML20102B855 (1) | |
Text
m
- ^ ~
/ y ,
(/l t Log # XX-4404 File # 905.4 TEXAS UTILITIES GENERATING COMPANY
{r[hQ ,,x,wAv rowen . .oo sonru ouve Mrnm, i..u. m . DAM.AM, TeXAM WOI To Aol L I
. 'f,H, ,
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
[DR ADOCK 05000445 PDR
\
?9
. . . . . . . . , - . , . . . . - . . . , . . . y
. - - - - - - . .. --