ML17207A779
| ML17207A779 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 01/04/1980 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-79-02, IEB-79-2, NUDOCS 8002040284 | |
| Download: ML17207A779 (2) | |
Text
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. BOX 529100, MIAMI,F L 33152 FLORIDA POWER 8 LIGHTCOMPANY January 4, 980 i-80-]
Mr. 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 Docket 50-335 IE Bulletin 79-02 The following information is provided as an amendment to our previous response to IE Bulletin 79-02 (FPL Letter L-79-183 dated July 5, 1979) and addresses the item in Inspection Report 50-335/79-22 regarding inspection records for supports on 2 inch and smaller piping systems.
In September and November 1977, Florida Power
& Light Company (FPL) reported to the NRC the results of their inspection of support anchorages installed at St.
Lucie 1.
The results of the 1977 inspections along with other analyses formed the basis for FPL's response to IE Bulletin 79-02.
The conclusion of the work in 1977 was that "In summary, all our efforts have confirmed that the as-built pipe supports are adequate and satisfy the FSAR design criteria".
The NRC accepted the 1977 report without comment.
The inspections and verification in 1977 were performed on the 2> inch and larger pipe supports.
The supports in general carry larger loads, are larger in size, and utilize larger anchors than 2 inch and under supports.
The same design criteria, fabrication inspections, and installation procedures apply to small bore pipe supports (2 inch and under) as to large bore pipe supports.
The same craftsmen, under the same supervision, installed all pipe supports.
Therefore, the conclusions reached with respect to the large bore pipe supports apply as well to the small bore pipe supports.
The loads on small bore pipe supports are generally smaller.
The anchorages for small bore pipe supports were selected from standards prepared for this purpose.
These standards were developed for a range of loads to be used in lieu of a unique design for each support.
The loads applied to these anchorages in general are much smaller than the maximum loads these anchorages can accept.
In all cases the applied load is within the conservatively designed maximum load for that anchorage.
In addition, the small bore pipe supports were designed using a static analysis.
This analysis is more conservative, by a factor of at least 1.5, than the dynamic analysis used for large bore piping as shown in FSAR section 3.7 '.4.4.
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Office of Nuclear Reactor Regulation Page Two Therefore, tions were the 2 inch and larger the 2 inch criteria.
it is our position that since the 23; inch and larger anchorage installa-found to be adequate and satisfied the FSAR design criteria, and since and under anchorages were designed more conservatively than the 23; inch anchorages and since all supports were installed under the same conditions, and under support anchorages are also adequate and satisfy the FSAR design The inspection records are available at the site for review.
Very trul
- yours, Robert E. Uhrig Vice President Advanced Systems 8 Technology REU/TCG/ah cc:
Harold F. Reis, Esquire