L-79-102, Responds to IE Bulletin 79-07 Re Seismic Analysis of safety-related Piping.No Such Computer Codes Used
| ML17206A809 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 04/26/1979 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| L-79-102, NUDOCS 7905240169 | |
| Download: ML17206A809 (6) | |
Text
P.O. BOX 629100, MIAMI,FL 33162 yg ppR g>>
A b: 26 FLORIDA POWER 8 LIGHT COMPANY April 26, 1979 L-79-102
'r.
James P. O'Reilly, Director, Region II Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite
.3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
Re:
RII:JPO 50-335 IE BULLETIN'79-'07 Florida Power 8 Light Company has reviewed the subject Bulletin and a response is attached.
Very truly yours, Vice President Advanced Systems 8 Technology REU/MAS/paf Attachment cc:
Harold F. Reis, Esquire
>9052CP lC g
/pig
" PPVICIALCOPVl-'
4 lyg
, I E
lt P
J'
ATTACHMENT RE:
RI I:JPO 50-335 IE Bulletin 79-07 Action Itern 1
None of the methods specified in the Bulletin were used by the Architect-Engine (A/E) or the Nuclear Steam System Supply (NSSS) vendor.
Action Item 2 Not applicable to the A/E or NSSS vendor (based on Action Item 1).
Action Item 3 The code used by the A/E for analysis of, the St. Lucie piping systems has been verified against the current version of the'IPESTRESS 2010 program..
The PIPESTRESS 2010 program has, in turn, been compared with solutions to sample programs generated by similar, independently written programs in the public domain, namely ANSYS and PIPESD.
This 'comparison shows the PIPESTRESS 2010 results to be substantially the same as results generated by the above programs and by hand calculations.
With respect to the NSSS vendor:
The time histories of the six components of force or moment "Fx, Fy, Fz, Mx
~z" at various sections of the'reactor coolant main loop ipin were computed separately for each of two orszonta an vertica directions of seismic excitation.
Each component of force or moment from one horizontal direction of excitation was combined by absolute summation on a time basis with the corresponding codirectional component of force or moment from the vertical direction of excitation, The maximum combined value over all time of each of the six components of force or tqoment were chosen to define the seismic loading condition at the particular piping locations for one horizontal and the vertical excitations.
A second seismic loading condition was also defined by repeating the absolute sum combinatjo'n'. for the other horizontal and the vertical excitations.
Each load set was compared to, and shown to be less governing than, the seismic loadings specified for design of the piping.
Because the combinati of loads was performed after the completionof the dynamic analysis portion of the computation, the appropriateness of the results of the combination was verified by direct observation of the uncombined inputs and the combine output.
The six components of force or moment (Fx, Fy, Fz, Hx, llew, liz) at the supports and various sections of the Pressur>zer'Sur e Line and S ra Line for St. Lucie I pi in were compute separately for each of two horizontal and e
yertica directions of seismic excitation by response spectrum dynamic analysis.
The codirectional components of force or moment from one horizontal and the vertical directions of excitation
~
p eismic lo di co dition
~ w Il tI
excitations.
A second seismic loading condition was also defined by repeating the absolute sum combination for the other horizontal and the vertical excitations.
Each load set was compared to, and shown to be less governing than, the seismic loadings specified for design of the piping.
The load combinations were calculated and verified by hand.
Action Item 4 Not applicable to the A/E or NSSS vendor (based on Action Item 1).
~, jul
~+~+ s' A