ML14358A174
| ML14358A174 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 04/18/1979 |
| From: | Trammell C Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7905110058 | |
| Download: ML14358A174 (4) | |
Text
UNITED S7, NUCLEAR REGULATO1I WASHINGTON, D. C.
April 18, 1979 Docket Nos.:
50-250 50-251 LICENSEE:
FLORIDA POWER AND LIGHT COMPANY FACILITIES:
TURKEY POINT UNITS 3 and 4
SUBJECT:
SUMMARY
OF MEETING HELD ON APRIL 13, 1979, TO DISCUSS SEISMIC ANALYSIS OF TURKEY POINT REACTOR COOLANT PIPING On April 13, 1979,the NRC staff met with representatives of Florida Power and Light Company (FP&L) and Westinghouse Electric Corporation (W) to discuss the seismic analysis of reactor coolant piping at Turkey-Point Units 3 and 4.
A list of attendees is attached. Highlights of the meeting are summarized below.
Introduction The meeting was requested by the NRC staff to gain a better understanding promptly of the original seismic analysis and recent reanalysis conducted by W for Turkey Point 3.
Following the disclosure that Stone and Webster Engineering Corp. had used a computer code for seismic analysis of piping that combined intra-modal stress combinations by the algebraic summation technique, the NRC staff conducted a survey to find out if this technique had been used by others on plants other than those designed by Stone and Webster.
Initial pre liminary response from W was that they had not used such a method.
How ever, in checking further, it was discovered that a W computer code WESTDYNE used the algebraic sum technique until 1971 at which time the code was modified to combine seismic stress combinations by absolute sum value technique, an acceptable method.
Since the NRC staff had earlier been informed that W had not used algebraic summation, and more recently learned that they had in fact used this method and that a reanalysis had been done for Turkey Point, the NRC staff re quested that this matter be discussed and resolved in a formal meeting prior to further operation of Turkey Point 3, which was conducting low-power physics tests in preparation for power operation.
1WESTDYNE is a W proprietary code adapted from ADLPIPE.
7906060
S-W2 Discussion As applied to Turkey Point, WESTDYNE with algebraic summation is the code of record for only the reactor coolant main loop piping. 2 This was reported to FP&L by W on April 9, 1979.
On April 10, 1979, FP&L requested W to reanalyze the reactor coolant (large bore) piping using the WESTDYNE" code, but corrected by using the absolute sum technique. The results were completed on April 12, and are sum-marized in an attachment. The results show essentially no changes in stress levels from those reported and accepted in the Turkey Point FSAR(FSAR Table 5A3, Amendment 24, November 24, 1970).
The main loop piping has very little coupling between the horizontal and vertical modes so the method of combination has an insignificant effect on the results. In addition for this piping, seismic loads are small when compared to LOCA loads.(LOCA is the limiting load condition).
Pipe support loadings were also examined and found to be essentially unchanged in the reanalysis. The reanalysis applies to both-units at Turkey Point.
Conclusions and Followup Action At the conclusion of the meeting, the NRC staff told FP&L that the re analysis was acceptable, and that Turkey Point 3 could continue operation.
-FP&L was requested to send NRC4a letter documenting the reanalysis results for both Turkey Point dockets.
W is checking on other plants which may have been analyzed using the earlier version of WESTDYNE.
Charles M. Trammell Project Manager Attachments:
- 1. List of Attendees
- 2. Letter from W (Anderson) to NRC (CaseT dtd 4-12-79 2 The pressurizer and spray line piping have been analyzed with WESTDYNE, but with a post 1971 version using the absolute sum technique.
3The current version of WESTDYNE has been reviewed and approved by NRC, although it has not been verified with benchmark problems.
4This was done the same day, April 13, 1979.
Robert E. Uhrig Florida Power and Light Company cc:
Mr. Robert Lowenstein, Esquire Lowenstein, Newman, Reis and Axeirad 1025 Connecticut Avenue, N.W.
Suite 1214 Washington, D. C. 20036 Environmental and Urban Affairs Library Florida International University Miami, Florida 33199 Mr. Norman A. Coll, Esquire Steel, Hector and Davis 1400 Southeast First National Bank Building Miami, Florida 33131 Mr. Henry Yaeger, Plant Manager Turkey Point Plant Florida Power and Light Company P. 0. Box 013100 Miami, Florida 33101 Mr. Jack Shreve Office of the Public Counsel Room 4, Holland Building Tallahassee, Florida 32304
LIST OF ATTENDEES FP&L MEETING APRIL 13, 1979 Florida Power and Light Westinghouse D. Whittier R. Sero
- 0. Pearson R. Brandon S. Brain NRC Lowenstein, Newman, Reis E. Case Axeirad & Toll R. Mattson N. Moseley
- M. Axelrad R. Bosnak V. Noonan A. Schwencer W. Russell C. Tramell K. Herring M. Hartzman E. Sullivan K. Wichman J. Fair R. LaGrange