ML18003A601
| ML18003A601 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 05/29/1979 |
| From: | Mcduffie M CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 7907190553 | |
| Download: ML18003A601 (2) | |
Text
CPP-5, Cttrollna Power rt Light Company C&~
May 29, 1979 Mr. James P. 0. 'Reilly, Directox Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, N. W.
Atlanta, Georgia 30303 Oi ZW
+0 Dc SHEARON HARRIS NUCLEAR POWER PLANT UNIT NOS. 1, 2, 3, AND 4 DOCKET NOS. 50-400, 50-401, 50-402, AND 50-403 WE. BULLETIN 79-07
Dear Mr. O'Reilly:
In response to your letter of April 14, 1979, Carolina Power Light Company has investigated the methods employed in the seismic analysis of safety related piping at the Shearon Harris Nuclear Power Plant (SHNPP).
The results of this investigation are summarized belov:
1.
Reactor Coolant Loo The reactox coolant loop vas analyzed by Westinghouse Electric Corporation using a direct integration, three&imensional, non-linear, time history technique using three statistically inde-pendent components of earthquake motion acting simultaneously.
This analysis did got employ earthquake directional motions vhich are not statistically dependent.
The computer code utilized by Westinghouse vas WECAN.
2.
Safet Class 1 Pi in S stems The Class 1 lines villbe analyzed using response spectrum modal analysis.
Two perpendicular horizontal and one vertical earthquake components villbe combined simultaneously vith the intramodal responses combined using square-root>>sum-of-the-squares (SRSS)
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The intermodal response vill then be calculated using SRSS summation of the individual modes.
In no instance villan algebraic technique be used to combine the responses.
The computer code to be utilized by Westinghouse is WESTDYN.
3.
Seismic Cate or 1 Pi in S stems All stress analyses conform to U.S.
Modal sumtnations vere accomplished by the SRSS method in con-formance to Regulatory Positions Cl.l, C1.2, and C2.1 of Regu-latory Guide 1.92.
The computer code utilized by Ebasco Services, Inc. for this analysis vas PIPESTRESS 2010.
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Mr. James P. 0. 'Reilly 9, 1979 The Westinghouse computer codes WECAN and WESTDYN are documented in WCAP-8252, Revision 1, "Documentation of Selected Westinghouse Structural Analysis Computer Codes,"
May 1977.
Comparisons of the computer codes with benchmark problems are also contained in the sub5ect topical report.
PIPESTRESS 2010 correlates favorably with solutions to problems generated by ANSYS and PIPESD.
CPSL plans no further action with regard to your letter.
Yours very truly, M. A. McDuffie Senior Vice President Engineering 6 Construction MAM/tl cc:
United States Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C.
20555