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: Difference between revisions

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(/l t Log # XX-4404 File # 905.4 TEXAS UTILITIES GENERATING COMPANY
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Log # XX-4404
CK                                     January 25, 1985                              Td Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555
{r[h File # 905.4 TEXAS UTILITIES GENERATING COMPANY Q
,,x,wAv rowen..oo sonru ouve Mrnm, i..u. m. DAM.AM, TeXAM WOI To Aol L January 25, 1985 Td I
'f,H, CK Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C.
20555


==SUBJECT:==
==SUBJECT:==
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==Dear Mr. Denton:==
==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.
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-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.
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.
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.
Should you have additional questions in this matter, please contact this office.
Respec tfully, W w.%-
Respec tfully, W w.%-
ohn W. Beck BSD/grr c- J. J. Stefano 8503040453 850125
ohn W. Beck BSD/grr c-J. J. Stefano 8503040453 850125
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Latest revision as of 03:43, 13 December 2024

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)
v • d • e


Text

m

^

/ y

(/l t

~

Log # XX-4404

{r[h File # 905.4 TEXAS UTILITIES GENERATING COMPANY Q

,,x,wAv rowen..oo sonru ouve Mrnm, i..u. m. DAM.AM, TeXAM WOI To Aol L January 25, 1985 Td I

'f,H, CK 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

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